Oninit® Archive
Results for “OPT_GOAL”
Not enough room in ROOT DBspace
Reduce the size of your PHYSFILE. You probably moved it to another dbspace after setting up the first server. Start it smaller, then create the plog dbspace and move it there and resize. j. On 1/4/17 4:09 PM, STEVEN AB wrote: > Hi, > > I'm trying to setup a new server with the …
Changing DBSPACETEMP run-time
Hi, IBM Informix Dynamic Server Version 11.70.FC5XE Please, is there a way to change DBSPACETEMP for a session inside 4GL? ------------------------------ Sincerely, Dennis ------------------------------…
ADO - activex data object
What do I require, to connect "ado activex data object" to Informix ? AIX 7.2 IBM Informix Dynamic Server Version 12.10.FC9W1 Regards Dirk…
listener-thread@soc_be.c:3073: err = -25582:
Adding Version details Informix Version : IBM Informix Dynamic Server Version 12.10.FC6 O/S Version : Red Hat Enterprise Linux Server release 6.9 Thanks & Regards, Karthik Rajan…
Informix and speculative execution
Hi all, I have seen speculative execution patches for Firefox and SQL Server. Are there speculative execution patches for Informix in progress? There is no IBM Flash for Informix Dynamic Server and speculaative execution! Regards, David.…
Rovoke insert permission but still can insert
I am doing it at the command line in the server directly in the directory C:\\\\Program Files\\\\IBM\\\\IBM Informix Dynamic Server\\\\11.50\\\\bin…
Performance loss for a query after 11.50 >12.10 up
Thanks Cesar! unfortunately no functional index to remote queries involved here only 15 LEFT joins written the 'Oracle way' (just to help...) If I were the Informix optimizer, I would be lost in such a query *lol* Trying to find out where the engine is spending time...…
12.10.FC6 Mac port released
IBM Informix 12.10.FC6 release for Mac OS is officially available! John F. Miller III STSM, Lead Architect miller3@us.ibm.com 503-747-1366 IBM Informix Dynamic Server (IDS)…
oninit taking ages
Hi all, before I post a PMR: did anyone see an informix instance take 25mn to start ? 25 minutes was with 12.10FC4 on a linux/red hat VMWare (big server according to the vendors) With 12.10FC5W1, i had to wait 46 mn before deciding to kill oninit. I am using huge pages and RESI…
Performance issue after migrate to IDS from Online
Questions: 1. After the database was recreated and loaded did you run the recommended suite of Update Statistics commands as described in the Performance Guide manual (or as implemented by my dostats utility) or are you depending on Auto Update Statistics (AUS)? 2. So, you m…
RSS not working
-bash-4.2$ onstat - IBM Informix Dynamic Server Version 11.50.FC9 -- On-Line --…
Informix upgrade
Can we upgrade informix from Dynamic Server Version 11.70 to 12.1 workgroup edition directly?…
when use IfxDataReader.GetIfxDateTime to NULL valu
Hello, The version of Informix products in my environment is: Database server: AIX IBM Informix Dynamic Server Version 10.00.FC5 IBM Informix CSDK Version 2.90 IBM-ESQL Version 2.90.FC4 Client: PC Windows IBM Informix-ESQL 3.70.TC5DE.…
Poorly Optimized SQL
So here's an interesting little nugget that I just realized: The Explain Plan doesn't always print out the "Query Statistics" portion. The plan of tables and joins is printed, but not the stats breakdown. This section prints a long time after the query is started, so if I kill th…
IDS 12.10 - dbimport very slow
Hi Markus, Is your import logged ? Regards, Henri MOUKOURI Le 25 juin 2013 à 10:45, "MARKUS BRINKBäUMER" <markus.brinkbaeumer@gmail.com> a écrit : > Hello, > > we have a new server (Windows 2012, 8 GB RAM, 4 x 600 GB SAS 15k HDD). On the > server we have installed an IBM Inf…
Performance Tuning Discussion
Ok it seems you have a big hardware, what´s your Informix version? What´s your box architecture? For performance tips, there is a good article in Andrew Ford´s blog, that should clarify your thoughts.... http://www.informix-dba.com/p/informix-innovator-c-tuning-basics.html This…
DB_locale or local naming convention
Hi, I already mention the informix version. IBM Informix Dynamic Server Version 11.70.TC1IE…
Physical log size
Art, Thanks for the info. We do have enough buffer cache to effectively buffer most of what will be active at any point, so it really does come down to monitoring the various checkpoint-related stats. It was just really confusing that the message indicated that it would be fas…
Error -556 on @ reference
In IDS_A have a stored procedure do_some that has a insert into a local table. In IDS_B have a stored procedure do_some that does: call base@IDS_A:do_some(); Calling this sp works ok. In IDS_C i try to run: call base@IDS_B:do_some(); Fails with error -556 Cannot create, drop,…
Config Help
Your biggest performance problem is that you are running your server on a VM. IO performance under VMWare is VERY VERY POOR and, as I've said several times already this month, databases live and die on IO performance. Art Art S. Kagel Advanced DataTools (www.advancedatatools.co…
What are best onconfig parameters for a DSS app
OK, so I've made your suggested changes to onconfig. Now, since my app is only does queries, is it possible for me to disable transaction logging and checkpoints? Also: 1. What about enabling DIRECT_IO, or is that feature only available for UX raw disk partitions? 2. Do I need…
IDS 7.31 UD5 data(base) recovery
Informix Dynamic Server Version 7.31.UD5 I understood that IDS 7.31 entered End Of Support in September 2009 ( 2 and a half years ago) I hope this is not a business critical system…
enterprise replication time to replicate data
IBM Informix Dynamic Server Version 11.50.FC6 Question for enterpise experts Does anyone know a command that will give me time that it takes to replicate data to a node? for example i update on server a and it replicates to server b . How long did it take? cdr view profile gives …
Over 1,000 days of 24x7 database uptime!
On 29.07.2011 20:38 Lester Knutsen wrote: > From one of our customers, their Informix server hit 1,000 days today > .... congratulations;) > > IBM Informix Dynamic Server Version 10.00.FC8 -- On-Line -- Up > 1000 days 00:31:45 -- They beat mine just bit ... IBM Informix D…
Setting up HDR- First Time -11.70 Innovator-C
Hi, I am setting up HDR for the first time. onstat - on primary shows IBM Informix Dynamic Server Version 11.70.UC2IE -- On-Line (Prim) -- Up 0:11:5s onstat - on secondry shows IBM Informix Dynamic Server Version 11.70.UC2IE -- Fast Recovery (Sec) -- Up 00s onstat -m on sec…
ISAM error 197: Partition recently appended to
Informix Dynamic Server Version 9.40.UC5 SUSE Linux Enterprise Server 10 (i586) I have done a level 0 backup directed to /dev/null and tried again. still it is throwing the same error.…
First row optimization returned single row
Optimization first_rows will use the index on 'dated' to locate the rows that match the filter and to satisfy the order by clause while optimization all_rows may perform a table scan and sort the rows to satisfy the order by clause unless the data distributions indicate that this…
Physical Log Size
How did you "increase" the size? You can only do that song onparams. You cannot do that just by changing the Onconfig file Art On Jan 25, 2011 12:10 PM, "KENT GRUNDEN" <k.grunden@hoogwegtus.com> wrote: > IDS 11.50.FC4WE Windows Server 2008 64bit > > I keep getting the message wh…
Tool to estimate the size of an index
Sorry, I forgot to provide the version of the installation: IBM Informix Dynamic Server Version 11.50.FC4 Operative System: AIX Version 6.1…
limit on query length in Informix IDS 11.50
Is there a limit on query length in Informix IDS 11.50? If there is one, can it be increased? Also can anyone suggest some information on how to optimize IDS 11.50 for longer queries to make them run faster? We have some Cognos reports that send very long queries to IDS 11.50 …
Query works fine in IDS 10 but crashes 11.5 engine
Jonathon wrote: I'd post what the optimizer has to say, but sadly it never gets that far. It prints out the last query right before this one (which completes successfully) and then the oninit process hangs and the optimizer information for the query in question never gets printed…
Can't access sysindexes remotely
Hi, We are using IBM Informix Dynamic Server Version 11.50.FC6 using Platform: SunOS 5.10 Generic_125100-09 sun4v sparc SUNW,Sun-Fire-T200 Thanks…
optimizer using wrong index
You can use an optimizer directive to suggest an index for the optimizer to use. The optimizer is free to ignore your directive if it finds that it doesn't make sense, but will usually follow your recommendation. Note that IDS normally finds that sorting is so fast that it will …
Re: Query-Optimizer on HDR-Secondary
Hi folks, I talked to my informix-supporter: Rebuilding the hdr-mirror solved the problem. Regards Markus Bschorer "Markus Bschorer" <mb@worxbox.com> schrieb im Newsbeitrag news:4bd44874$0$6892$9b4e6d93@newsspool2.arcor-online.net... > Hi Art, > > thanks a lot for your answers…
Query-Optimizer on HDR-Secondary
IDS 11.5 FC4 Linux 64 Bit Hi everybody, it seems, that the IDS-Optimizer works different on primary and (hdr-)secondary servers, having identical IDS-Versions. Example: create table wbx_permission ( per_object_id char(20), per_client_id char(10), per_user_type i…
ids query optimizer.
As I understand it, most query optimizers are cost-based. Some can be influenced by hints like FIRST_ROWS(). Others are tailored for OLAP. Is it possible to know more detailed logic about how Informix IDS and SE's optimizers decide what's the best route for processing a query, ot…
Random Server Slowdown "Redone"
There are some usual things you could do for now: 1) calc your database ratios, I think there are several NETTYPE, BUFFERS and even BTSCANNER options that could be optimized, you could download Mr. Art script to automatically know these important numbers!!! It´s on the download …
Informix Dynamic Server Software Downloads
It appears IBM has cleverly hidden the IDS downloads again on the Passport Advantage Website, at least from my prying eyes. I can find the Solid DB and the DB2 links just fine. Does anyone out there in IIUG-land with a Passport Advantage account know where IBM has stashed the dow…
Seeing one oninit working hard while others are no
No the parameter is SQLTRACE which appears to be off, at least the config line you posted is commented out: #SQLTRACE level=low,ntraces=1000,size=2,mode=global Art Art S. Kagel Oninit (www.oninit.com) IIUG Board of Directors (art@iiug.org) Disclaimer: Please keep in mind that…
OPTCOMPIND and perl
Anyone know if I can change OPTCOMPIND after establishing a DB connection or does it need to be set before connecting? ta SLES10 SP1 IBM Informix Dynamic Server Version 10.00.UC5…
Insert into an indexed table is really SLOW!
MIKE DUNHAM-WILKIE wrote: > I am running into performance problems inserting into an indexed table, using > Informix 11.50. The following timings for loading into > compressed/uncompressed, indexed/non-indexed tables using dbload/HPL-Deluxe > more illustrate the problem. The numb…
Informix Dynamic Server Scheduler question
Hi! I'm working on a project at my faculty. It's a java desktop application with an informix database. I have a problem using informix dynamic server scheduler. I have a particular table in my database. This table contains records that are inserted by the desktop aplication I'm …
IDS 9.40 End of Support Imminent
I have seen a number of posts on CDI recently related to IDS 9.40 As per the announcement on September 7th 2007, effective on the dates listed below, IBM will withdraw support from the following product releases licensed under the IBM International Program License Agreement: 9…
use stored proc that return multiple columns in a query
forgot to include version info: IBM Informix Dynamic Server Version 10.00.UC6W5 -- On-Line -- Up 207 days 22:14:39 -- 1441100 Kbytes…
installing informix dynamic server in linux
hi, I'm new to informix... I tried to install informix dynamic server(iif. 11.50.UC2E.Linux-RHEL4.tar) in my linux machine. I'm getting an error like this... One or more prerequisite system libraries are not installed on your computer. Install libpam.so.0, libncurses.so.5…
Re: Please help optimize a query:
First cut: 1. Update statistics to the recommended levels (see the Performance Guide and John Miller III's white paper) 2. Save SET EXPLAIN output for this original query and all subsequent attempts to optimize it. 3. Why are you forcing the use of a particular index? Let th…
Please help optimize a query:
//QUERY IS AS FOLLOWS: select --+index (s ix_sr2) s.trandt ,sub_min as min ,s.s_class ,s.status ,s.active_dt ,s.exp_dt ,s.canc_dt from status_records s where s.canc_dt >= '08/04/2008' and s.canc_dt < '09/04/2008' and s.canc_dt = (select --+index(y ix_sr2) max(canc_dt)…
Informix Dynamic Server v 11.50 Developer's Edition
Does everyone know that the Informix Dynamic Server Developer's Edition v11.50 that you can download from the IIUG Web site (www.iiug.org) is NOT timebombed, is completely and fully functional (including HDR, MACH11, ER etc.). Do you know that the only limitations on this versio…
Informix Dynamic Server v 11.50 Developer's Edition
Does everyone know that the Informix Dynamic Server Developer's Edition v11.50 that you can download from the IIUG Web site (www.iiug.org) is NOT timebombed, is completely and fully functional (including HDR, MACH11, ER etc.). Do you know that the only limitations on this versio…
CONFIGURATION ONAUDIT-IBM Informix Dynamic Server
Hello, I need to configure onaudit and onshowaudit able to register for each of the consultations that are made to the database, either through dbaccess, ODBC or another application. I've been reviewing the IBM Informix Trusted Facility Guide, but I was not working. What param…
Informix external directives ?
TBP schrieb: > Joerg Rueschenschmidt wrote: >> Joerg Rueschenschmidt schrieb: >> >>> Hi all, >>> >>> Is it possible to use Informix external directives for statements >>> with host variables ? >>> >>> It works fine for statements without host variables. >>> >>> Now, I need to sol…
How to use Informix Dynamic Server
I have installed trial version of "Informix IDS Dynamic Server Developer Edition 11.5 for Windows 2003, XP, Vista, 32bit Version 1150TC1DE". But i am new to informix. Can anyone explain how to use IDS in detail.…
Caching Data to Buffers
Regarding Update Stats - short answer It synchs meta data with your real data, providing the SQL optimizer with the best possible query plan(s). MM…
Re: unkillable sid's
On Feb 29, 4:58 pm, Darren_Jac...@carmax.com wrote: > Here is the stack from the onmode -X: > > 17:51:37 Stack for thread: 309 sqlexec > > base: 0xc000000249ffd000 > len: 69632 > pc: 0x0000000000000000 > tos: 0xc000000249ffecd0 > state: running > vp: 3 > > ( 0) 0x4…
What is IPA abbreviation ?
Hi all IBM INFORMIX DYNAMIC SERVER 10.00 PRODUCT RELEASE bug_number 168928 description WITH NON-DEFAULT PAGE SIZE AND ACTIVE IPA'S, TABLE LEVEL RESTORES FAIL product_code ONUTILS component_code ARCHECKR What is IPA ? Thanks…
Identify Optimizer issues
On Jan 2, 9:16 am, "Art S. Kagel (Oninit LLC)" <a...@oninit.com> wrote: > mohitanch...@gmail.com wrote: > > Version: IDS 10 > > Platform and exact version/patch level are helpful. > > > Recently I saw some inconsistencies in optimizer taking incorrect > > index path. This Bug has…
4gl/esql syntax
On Wed, 2007-08-08 at 13:35 -0400, sergio kapul wrote: > looking for correct syntax to create directives inside > queries to overwrite optimizer query execution plan, > to be used in 4gl/esql, I got something that works in straight sql, but it's > ignored when I put it inside of …
IIUG TV
Great job on the video work!! I look forward to seeing more! -t- -- -- Informix Dynamic Server Database Engine -- http://www.informix.com --…
IDS Optimizer Query Plan, declaring and naming indexes
I'm seeing differences in performance for the same SQL being executed on two slightly different databases. Using Set Explain, the difference is when database1 exectues part of the WHERE, it goes down the Index Path for that particular table and it's fast. On database2, the query …
Optimizer Question
Yoo could lose light scans by making buffers too big. j. >From: Mary Gregory <mary.gregory@rheem.com> >Date: 2007/06/06 Wed AM 09:07:04 CDT >To: ids@iiug.org >Subject: Optimizer Question [9297] >Could the addition of memory to IDS (BUFFERS, SHMVIRTSIZE) cause the >optimizer to…
Re: admin tools like PC client
Mike, What version of Informix are you using? Informix SE? Informix OnLine? Informix Dynamic Server? Most Informix versions these days come with a product call I-Connect that needs to be installed on the PC and rovides the Informix ODBC drivers.…
Error when initializing
06:36:20 IBM Informix Dynamic Server Version [b]10.00.UC6TL[\\b] I believe this is likelt ot be a new ish instance to a newish user of the software…
query execution plan
As Jack Parker mentioned earlier, there may not be any problem, optimizer just choosing query path based on number of rows. If you are seeing performance problem with one plan versus other, may consider using optimizer directive to enforce the correct path. -Sanjit Chakraborty…
Question on SHMVIRTSIZE
On 08/05/07, Mary Gregory <mary.gregory@rheem.com> wrote: > I still haven't found a good way to determine whether or not adding more > virtual memory to the instance would speed up queries or not. I think I > might try to add another 128 MB just to see what happens. Also, I am > …
problems with Informix dynamic server 9.4 @ WIndows 2003
I have problems with connecting the server. I use correct user/password to connect to the server, but the server do not known the server. I'm sure the user exist and is one of the user in Informix_Admin group. I have installed Informix dynamic server 9.4 in a windows xp system in…
Re: query optimize
Devaraj Takhellambam said: > Thanks for replying...The query has been working well and takes just about > 20-30 minutes in the past but recently it has been degraded and took about > 3-4 hours and sometimes 5 hour..so i thought it needs to be > optimized....Thanks.. OK, so how a…
query optimize
Hi, How can I optimize the informix query below- the query uses an OUTER join... select col1, col2, '' col3, col4, A.col5, A.col6, count(*) cout from table A, table B, table C, OUTER table D where A.col9 = B.col9 and A.col7 = D.col7 and A.col8 = 'Y' and …
License Extension
Help.. I need a license extension for the IBM Informix Dynamic Server Version 10.00.FC3R1TL which I downloaded to do a evaluation. How can I get the license extened..my project is in the final stages .. Dhaya Commercial bank…
Re: Security Vulnerabilities Addressed in Informix Dynamic Server
Clive Eisen wrote: > Ian Michael Gumby wrote: > > Yes the buffer overflow issues are a pain and frankly they shouldn't occur > > if IBM did formal code reviews. Or rather they should be caught and > > corrected prior to release. > > > > "Paul Watson" <paul@oninit.com> wrote in m…
Security Vulnerabilities Addressed in Informix Dynamic Server
Not sure if this has posted here or not but .... http://www-1.ibm.com/support/docview.wss?rs=630&context=SSGU8G&dc=D600&u id=swg21242921&loc=en_US&cs=UTF-8&lang=en Cheers Paul Paul Watson Tel: +44 1414161772 Mob: +44 7818003457 Web: www.oninit.com GO FURTHER with DB2 GET THER…
Performance issue after 732 to 94fc6 upgrade
Hello, Not easy without knowning the structure of you tables or the number of rows. First thing I would look into is the sequential scans. But as the cost is very low, I assume the tables have only a couple of rows, so this should not make any difference. If you say the snippet …
Initialising Informix
I am trying to initialize informix on a new server and I am getting this error. The server is HP UX 11.11 and Informix IDS 7.31 What could be the problem / This action will initialize Informix Dynamic Server; any existing Informix Dynamic Server databases will NOT be accessible …
Informix Connection From WIN CE.NET Emulator?
How do I connect to informix dynamic server from WIN CE.NET Emulator? Is there a WIN CE informix driver?…
Re: Table Editor for Multiplatforms
Enhancements in Version 4.3 ..... also supports the Informix Dynamic Server 9.x. http://www.ibm.com/software/data/db2imstools/db2tools/db2te/…
Fragmentation Elimination Problem
I am on version IBM Informix Dynamic Server Version 10.00.FC4.…
Re: Informix Dynamic Server 9.30 - Shared Memory
Ronald Schwingel wrote: > Can someone please tell me how much Shared Memory (gigabytes?) > Informix Dynamic Server 9.30 (32-bit version) for AIX 5L can use > before asserting with a Shared Memory access error? Can you provide > documentation that I can pass on also? It looked to…
RE: Informix Dynamic Server 9.30 - Shared Memory
First off you shouldn't be getting shared memory access errors. That sounds more like a bug that technical support should address. I wouldn't be surprised if your getting can't allocate additional shared memory segment messages. Informix 32-bit on AIX is a bitch. The problem …
Informix Dynamic Server 9.30 - Shared Memory
Can someone please tell me how much Shared Memory (gigabytes?) Informix Dynamic Server 9.30 (32-bit version) for AIX 5L can use before asserting with a Shared Memory access error? Can you provide documentation that I can pass on also? We are looking at providing one of cust…
create a DB on Linux
Hi! I have installed Informix dynamic server on Linux. Now I want to create a data base. What should I do? Thanks…
Re: flagship sunk
Funny I have been able to download IDS 10 for Solaris, Windows and Linux am I just smarter than everyone else? www.informix.com Support and downloads In the middle trials and betas Oh look Informix Dynamic Server (IDS) V10.0 easy!…
Re: IDS 10 - documentation questions
Oops! I mean IBM Informix Dynamic Server Version 10.00.TC3ET Althought the release notes (idse_win_release_notes_10.0.html) start with:- "Release Notes for IBM Informix Dynamic Server Express Edition for Windows Platforms 10.00.TC3E, 1 July 2005 " so it is TC3E or TCE3T? and …
Re: Sql to concatenate multiple rows to a single row / column
Thank you SaltTan - it works beautifully. BTW, we have IBM Informix Dynamic Server Version 9.40.FC6.…
Re: IFX_FLAT_UCSQ
>> I am sure flattening of uncorrolated subqueries (all, some types? don't know!) is off by default. This is not correct. I am sure that any query can be flattened if the cost says to do it that way. Also read the excellent link that Bill Dare included: http://www.iiug.org/waiug…
OPTCOMPIND
I set to to 0. I have seen loads of questions on here in the past about upgrading to IDS and finding everything running slowly. It appears that sometimes even though 2 should mean least cost the optimizer gets it wrong and will not use indexes. Setting OPTCOMPIND to 0 avoids th…
New IDS Forum on IBM Developerworks website
This forum provides a place for Informix Dynamic Server developers and users to share their questions, thoughts, and ideas with others. http://www-128.ibm.com/developerworks/forums/dw_forum.jsp?forum=548&cat=19…
Re: IDS 10 Express Edition
Note 10.00.xC3 = Enterprise Version 10.00.xC3E = Express Edition http://publib.boulder.ibm.com/infocenter/ids9help/index.jsp?topic=/com.ibm.relnotes.doc/uc3E/idse_win_release_notes_10.0.html Then click on "IBM Informix Dynamic Server Express Edition" in the right pane:…
setup Informix Dynamic Server Version 9.40.UC1E1 to linux error
I setup Informix Dynamic Server Version 9.40.UC1E1 to linux execcute oninit -ivy is failed the online.log is write /// 16:31:32 Dynamically allocated new virtual shared memory segment (size 8192KB) 16:31:32 Informix Dynamic Server Version 9.40.UC1E1 Software Serial Number AA…
Cost Estimation for queries
Again optimizer considering BUFFERS/RA_PAGES while considering estimated no of I/Os is not a good idea since buffers are part of volatile memory where at a point of time we cannot be sure how many pages reside in memory satisfying the query for which optimizer is evaluating the b…
Re: purpose of optcompind and optgoal
calyanram@hotmail.com wrote: > Hi > > what is purpose of these two parameters ? > > regards > s.kalyan I'll answer since I was one of the users pressing for something like OPT_GOAL to be implemented back in the 7.24 days. OPT_GOAL tells the optimizer whether to optimize for the…
purpose of optcompind and optgoal
calyanram@hotmail.com wrote: > Hi > > what is purpose of these two parameters ? > > regards > s.kalyan I'll answer since I was one of the users pressing for something like OPT_GOAL to be implemented back in the 7.24 days. OPT_GOAL tells the optimizer whether to optimize for the…
Informix Dynamic Server information Centre
Great new utility just posted under IDS 10 on the docs site has uses for other products and versions than just IDS 10 so take a look even if you are not using 10 yet!! http://publib.boulder.ibm.com/infocenter/ids9help/index.jsp…
Cannot find message file. Check INFORMIXDIR and DBLANG.
im trying to run the oninit -i in the command prompt when the message appear... we installed... IBM Informix Dynamic Server 9.40 IBM INFORMIX-4GL Rapid Development System Version 7.32.UC2 IBM INFORMIX-4GL Version 7.32.UC2 set up sqlhosts, services, onconfig, path... but when tr…
Re: SPL DATETIME bug ????
This performance fall off is only on datetimes, if the where clause uses integers then it's fine. If I drop the datetime select into the exec blade the performance is back to 0.3 Art S. Kagel wrote: > Paul Watson wrote: > > The difference is that effectively the second query/s…
RE: SPL DATETIME bug ????
check the explain for both query, I believe they are deferent. In the first query the optimizer know the range of date at optimization time, but in the second it do not. In each query he build deferent query plan. You should force the optimizer to work as the first query using di…
chunk capacity
we are using BM Informix Dynamic Server Version 9.40.UC2X3 on Linux Kernel 2.4.21 the command 'onstat -d' shows ... Expanded chunk capacity mode: disabled how can I change this mode to 'enabled'?…
IDS V7.30 and Windows 2000
Can Informix Dynamic Server Version 7.30.TC6 be run on a Windows 2000 host system? TIA Erwin…
Re: Error Initialize Informix Dynamic Server
Art S. Kagel wrote: > On Wed, 04 Aug 2004 05:05:41 -0400, madiego wrote: >>I install Informix Dynamic Server and when I initialize 'oninit -iv' : >> >>This action will initialize Informix Dynamic Server; any existing Informix >>Dynamic Server databases will NOT be accessible - Do…
Error Initialize Informix Dynamic Server
Hello, I install Informix Dynamic Server and when I initialize 'oninit -iv' : This action will initialize Informix Dynamic Server; any existing Informix Dynamic Server databases will NOT be accessible - Do you wish to continue (y/n)? y Checking group membership to determine ser…
Re: IDS9.4/AIX5.2 performace degradation
Dalibor, A piece of tuning advice that has many times hit this list, is that you should have one CLEANER per LRU. So, having LRUS = 8 implies that you should have CLEANERS=8 also, to keep up with the overhead. Ben Thompson wrote: > Dalibor Krleza wrote: > > I may have missed i…
Re: IDS9.4/AIX5.2 performace degradation
Dalibor Krleza wrote: I may have missed it in your long post, but I didn't see anything about disc layouts or number of CPUs. Also I may have missed it as well but I couldn't see any output from "onstat -g iof" or "onstat -g iov". I have commented on your onconfig anyway. > OK …
Re: Informix Dynamic Server and DB Tuning
I am experiencing similar problems with users migrating from Standard Engine to IDS 9.30. It appears that some applications are more susceptible than others. What application(s) are you running? We also have experience of adding more BUFFERS, LOCKS, etc and not improving the sit…
RE: Informix Dynamic Server and DB Tuning
Muthana Increase BUFFERS in onconfig file. UPDATE STATISTICS for each table (as a minimum) rerun the query and see what improvements you get. If you still have problems post the results of:- onstat -p onstat -m onstat -R and sqexplain.out of any particularly slow query or updat…
Re: 9.40 query optimiser problem
Thanks Art, David and Paul - distributions it is! However, it is interesting that the problem goes away if you set: OPT_GOAL -1 # ALL_ROWS Counter-intuitive? -- Regards, Doug Lawry www.douglawry.webhop.org "Doug Lawry" <lawry@nildram.co.uk> wrote: > A client has IDS 9.4…
Informix Dynamic Server and DB Tuning
Dear Sir, The question how can make DB Tuning for Informix Dynamic Server version 9:30 to get the query faster. I used IDS 9:30 and it's not quick enough like our old Standard Engine. which Parameter can i change to make that or what shall i do? Regards Muthana AL-Temimi…
9.40 query optimiser problem
A client has IDS 9.40.FC1 on HP-UX with: OPTCOMPIND 0 # Nested loop joins preferred OPT_GOAL 0 # FIRST_ROWS UPDATE STATISTICS (no distributions) has been run. According to "sqexplain.out", queries involving several tables, with a fixed condition on one table for whic…
Can IDS accessing Informix SE Tables.
Hello, Now we are using Informix SE. We are planning to go Infomix Dynamic Server 9.x. Before migrating our current applications to IDS 9.x., first we have to develop a new application in IDS 9.x, in that we need to use some of the tables from informx SE. Could you please answer…
Dose anybody have the dbtop script in the Troubleshooting informix course?
Dears, I study the Troubleshooting ibm informix dynamic server course. At the module 4 exercise need the dbtop script. Dose anybody has this dbtop script and post for me? Thanks. Philip Yeh.…
Work group edition - Unlimited edition??
Taken from IBM web site:- =========================================================================== The following Informix Dynamic Server Workgroup Unlimited editions have been added to the IBM Data Management Gold Transaction Processing Bundle for SMB Unlimited: IBM Informix…
Re: [Informix Dynamic Server (IDS):] Digest 2671
For a course in the US, check out: http://www-306.ibm.com/services/learning/ites.wss?pageType=course_description&co urseCode=L1760&country=us&language=en (IBM course L1760). There is probably a similar course offered in Europe somewhere. Hope this helps. Kevin Doiron Toronto,…
Re: Re: Query Permormance improvement: URGENT
>Nonsense. The order in which the optimiser decides >to do the processing is critical. I Agree, but as long as the optimizer give a plan wich has some _sense_ , which is certain almost all the the time... But in the cases when the optimizer plan is _nonsense_ (statistics et all…
Re: Transaction support in informix dynamic server(IDS)
chaithra wrote: > i wanted to know, if in IDS we can get to know the status of a > transaction at any given time. or once any transaction commits or > rollsback we should be able to know the status. > is it possible through c++ interface provided by the IDS. I'm not quite s…
Transaction support in informix dynamic server(IDS)
hi all, i wanted to know, if in IDS we can get to know the status of a transaction at any given time. or once any transaction commits or rollsback we should be able to know the status. is it possible through c++ interface provided by the IDS. thanx in advace chaithra…
Re: Query Optimization ... Is this all I can get??
The reason your original solution didn't work well is that You needed to have the correct indexes, which you have added and then the outer join query should be better and faster. > Although your first option would work in my case, it would be a mess, > as they would have to be O…
configure computer for using informix
what shell I do to make my computer work with informix. I have installed winXP on my computer, informix 4 i informix dynamic server? THANKS…
Re: Query Optimization ... Is this all I can get??
Anthony Presley wrote: > > Although your first option would work in my case, it would be a mess, > as they would have to be OUTER joins of the address and phone table, > and the joining of some 100K with 300K with another 150K takes some > time [although, this was my original sol…
Re: Query Optimization ... Is this all I can get??
Yes - (amendment to my own response) - it's usually best to head an index with the most selective column, unless you have lots of queries that only reference the other column(s) or have an ORDER BY or GROUP BY that requires the index to be in a particular sequence. As for UPDATE…
Re: Query Optimization ... Is this all I can get??
Thanks for everyone's advice. Unfortunately, I am using a combination of Java and I4GL (moving everything to Jasper Reports at the moment), and was just using the "FOREACH" as an example. In reality, it is a for loop. I first added the (type, type_id) index, and then did an up…
Query Optimization ... Is this all I can get??
Hello all .... Always with the query questions .... so I come to you once again. 1st -- my textbooks on this subject are rather sparse, and a bit ... un-useful. Anyone have any good links / articles / books on query optimization? 2nd -- the actual problem .... I have a SIMPL…
Where can I get the client API?
Hi, does anyone knows where to get the client API for Informix Dynamic Server 7.x? Perhaps we want to access the server via api directly. Kind regards, Joachim Engel.…
Informix optimizer
Hi, Does anyone know if the Informix Dynamic Server (7.31 or 9.4) database optimizer uses star schema optimizer techniques? Thank you, Tony…
TRUNCATE TABLE command in 9.3?
I am aware that Informix Dynamic Server previously has not included the TRUNCATE TABLE command. Does anyone know if 9.3 or 9.4 include this command?…
Linux fgl_getenv
Informix Dynamic Server Version 9.30.UC3 on Linux. Do I have to do something before I can use the fgl_getenv call in a stored procedure? When I try I get 674: Routine (fgl_getenv) can not be resolved.…
Redbrick Query Optimizer behaving funny.
Hi All, Today I saw very funny behaviour of Redbrick query optimizer where the order in which tables are listed in the from clause is controlling the indexes being used. I am sending the results of explain for both the conditions: CONDITION 1: ============= RISQL> explain …
RE: Dynamic Server versus Universal Server ??
Originally, Version 7.x was called 'Informix Dynamic Server', Version 9.0x was called 'Universal server' Starting with 9.1, Universal server became 'Dynamic server with Universal data option'. With 9.2, new names 'Internet Foundation 2000 ' and 'Dynamic server 2000' ware given…
Informix Dynamic Server 2000 startup problem
Hi, While starting up informix in multi user mode , we wait for the database to come up by checking the onstat - o/p . But if the system is loaded, even after onstat shows status as online , the connection is rejected by the database . The wait loop that we do is as follow…
OPT_GOAL setting at 4gl level
Hi, I have checked the manuals about where I can set the OPT_GOAL parameter. Below are the IBM docs, but they do not specify if I can set the OPT_GOAL in the 4gl code. Can anyone confirm if I can set this in the 4gl code? If I must do this at the session/user level, I assume this…
Different query execution plan
Ravi If the number of rows are different and the distribution pattern of the relevant columns are different then it is certainly possible that the optimiser will chose different paths on different databases. Assuming update stats has been run recently on both databases. MW > -…
why I can't see the output of "onstat -g wts"
test:/informix>onstat -g wst Informix Dynamic Server 2000 Version 9.21.FC7 -- On-Line -- Up 5 days 13:23:03 -- 11132960 Kbytes Wait statistics not enabled How to enable the wait statistics???…
informix SDK 2.81 ifxoledbc OLEDB and ADO
When Updating or deleting a non existing row in a table, the informix oledb provider produces an "UnSpecified error". Environment: Informix Dynamic Server 7.31 Informix SDK 2.81 ADO 2.6 Any help will be appreciated. Thanks in advance…
Re: OPT_GOAL
On Tue, 20 May 2003 10:00:30 -0400, Greg Mitchell wrote: Setting OPT_GOAL to zero (or using FIRST_ROWS optimization in SET OPTIMIZATION or optimizer hints) is useful for internactive applications where records will be displayed a few at a time. It makes the app appear to be mor…
Re: OPT_GOAL
Greg Mitchell wrote: > Does anyone have any comments on OPT_GOAL > > We've experimented with setting it to 0 and found it to be detrimental > to batch processing jobs. Not surprising! Setting it to 0 (zero) will return the first few rows as quickly as possible, but will probably…
OPT_GOAL
Does anyone have any comments on OPT_GOAL We've experimented with setting it to 0 and found it to be detrimental to batch processing jobs. My understanding is that it will influence the optimizer to choose a path that will return the first rows quickly but not necessarily ALL r…
What requires an IDS Linux?
Hello What requires an Informix Dynamic Server Linux a desktop and/or a network version of Linux? Thanks in advance Jacqueline Romero Miranda…
Informix v Oracle
Hi Is there a function in Informix Dynamic Server 2000 that is like Oracles CREATE SEQUENCE that uses NEXTVAL/CURVAL and %ROWCOUNT, ect? Thanks for all contributions Jordan jbruce@asaglobalserv.com…
How do I set FIRST_ROWS for client session?
Set the environment variable OPT_GOAL=0 or add a SET OPTIMIZATION FIRST_ROWS in the apps. Art S. Kagel bafarwell@earthlink.net wrote: > > Does anyone know how to set the FIRST_ROWS optimization goal for a > client session (i.e. Windows client using native libraries, setnet) so …
Insert performance is poor
Have you added any indexes? Have you recently deleted many rows from the table? The reason I mention this is that inserts to a full table which extends the number of pages used, inserting to pages never touched before, is more efficient than inserts which re-use pages deleted fr…
Retrieving product name
Hi all, Is their a system table somewhere on an informix server that stores the product name. For example 'Select owner from systables where tabname = � VERSION� will return the version of the server. I would like to be able to tell if a server is a Universal server or a Dynamic …
IDS 7.3x on Win2000?
Does Informix Online Dynamic Server 7.3x runs on Windows 2000 (Professional)? Thanks for your help. Guy Dillen…
Re: IDS 9.21 shared memory question
Also onmonitor has known bugs where it will change parameters without telling you when it should not! Description for Defect 112476 ONMONITOR WILL SAVE TXTIMEOUT VALUE IN HEX - THIS CAUSES IECC 4.0 TO ERROR "VALUE FOR TXTIMEOUT CONTAINS INVALID CHARACTERS" Workaround: Change th…
IDS2000
Just going through testing of a 7.24.UC8 -> 9.20.UC4 upgrade myself. Found one query so far that I just had to re-write. I don't know how the old engine even managed to perform that one with decent response time! What have you set OPT_GOAL to? -1 will optimize queries for all …
performance with very active threads
During a checkpoint you only have 8 cleaners utilized to flush 63 LRU's. That's 4 passes. Make LRUS=64 and CLEANERS=64. That's one pass. Let the disk subsystem figure out any contention. They're pretty good at that:) Also increase CKPTINTVL to every 30 minutes. Why have a …
Query Optimization: Wrong execution plan?
Hello All, I have a problem with a query: The query is the join of two tables select * from tab1, tab2 where tab1.pk=tab2.fk There're indexes on both fields (unique index on tab1.pk and indexes with duplicates on tab2.fk). The problem is that the query takes too much time. …
Re: How to search for a string in a TEXT field
Hi, :-( SELECT name, REPLACE(text,"ZNOTREADY","found") AS your_output FROM tablewithtextfield; Blobs are not allowed in this expression. I use Informix Dynamic Server Version 7.31.UC2A…
Loss of performance with IDS 2000
Hi Peter, We have HP-UX 10.20 and upgraded from IDS 7.30 to IDS2000 with the same problem. I did the UPDATE STATISISTICS as per the other posts but found no improvement. However, I did query analysis and found the cost was HUGE. I changed the query optimizer as follows and pe…
Performance comparison btn Informix and SQL Server
Thanks for all the suggestions, I will try them out, and give a summary about the results. P.S. One small question I have now is: optimizing one query brings another one down! :-( At least I have one query which takes double so long as it took before I run UPDATE STATISTICS.…
Create user in Informix Dynamic Server
Hello all I`m new in INS. Could you help me? I have Database server with one user Informix. How to create another user to Database?…
Informix ODS on Win 2000?
Does Informix Dynamic Server V7.31.TC5 for Intel Pentium Windows NT 4 also run on Windows 2000? Thanks for any help. Guy Dillen ITP…
Posting from the Informix-list
In article <8k1rhh$uf$1@news.xmission.com>, Lewis, Keith A. <Lewis@timken.com> writes > >Hello, > I have a problem with queries using all of the temp dbspace. We >just moved to IDS 7.31 FC4 from >IDS 7.30 UC3. The same queries run fine under the previous version of >Dynam…
Data type conversion in query
Does anyone out there know how to force the optimizer/engine to convert data types in a query? I have a query that is joining a CHAR(20) column to an INTEGER column. Right now it is trying to convert the CHAR to an INTEGER which won't work. If I could make it convert the INTEGE…
Informix cost???
Someone can said how much does Informix cost? I need to know: -Informix costs -cost for client Thanks very much. I need the last version of dynamic server for Unix. Ciao, Berna…
first 'n' rows
sveiga@my-deja.com wrote: > > In article <0cefcfc2.92a34d23@usw-ex0106-048.remarq.com>, > Esther <estherNOesSPAM@ts.es.invalid> wrote: > > I would like to know how can I use the "FIRST_ROWS" optimizer > directive > > and the "SELECT FIRST 'n' ROWS" directive. I don't know the s…
Replication
Hello everybody. I would like to know if it is possible to replicate an Informix database between a UNIX-based 7.32UC2 Informix Dynamic Server and an linux-based IDS2000 without problems. Thanks in advance. jhernandez@geuropa.com…
Left join ignores optimizer directive
Hey, I'm wondering if anyone out there has had difficulties with left joins? Our query goes incredibly slow with optimize set high and fairly quickly with it set low. In order to improve performance, we brought in a performance expert who specified some optimizer directives. W…
OPT_GOAL
Has anyone experimented with changing the default for OPT_GOAL from all row to first rows? Would anyone recommend using first rows for a 200+GB database? Does anyone have any good/bad experiences that they can share? MS Sent via Deja.com http://www.deja.com/ Before you buy.…
dynamic server with Informix distant database
We have this problem : - write of a html page (this pages will contain many many fields). - Receiving of the page data on a http server based on a M1 machine. - Using of 4gl/informix programs based on the M2 machine with the pages data - 4GL programs will set up a � result � tabl…
HELP! Informix Dynamic Server 7.3
I'm trying to install a new IDS on Linux (RedHat 6.1) on a cooked file. Everything looks right, but upon oninit, I receive the following: oninit: Cannot open chunk '/u1/naf_chunk'. errno = 2 oninit: Fatal error in shared memory initialization Log reflects: 09:11:07 Informi…
UDR Support in Informix Dynamic Server.
Can someone tell me what exact version of Informix Dynamic Server that first supported C User Defined Routines. I've tried searching for this on their website with no joy. (their advanced search doesnt work at all !) Rgds, Peter. Sent via Deja.com http://www.deja.com/ Before y…
OFFICE Connect V.1
Informix Office Connect, Version 1.0, is compatible with the following Informix servers: Informix Dynamic Server, Version 7.3 or later Informix Dynamic Server with Universal Data Option, Version 9.14 Informix Dynamic Server 2000, Version 9.2 or later e Informix-SE 7.23 n�o func…
System catalogue
Hello! Can anybody explain me how I can create trigger on "informix".systables? (The server I deal with is Informix Online Dynamic Server 7.3.) Max…
Query Optimizer Weirdness in Stored Procedure
(Environment: Sun Enterprise/450, SunOS 5.6, Informix 7.30UC5) Greetings All! Has anyone out there encountered this same problem, and figured out a solution? I have a single table with over 10 million records in it. I am trying to retrieve a small number of records from it ba…
Compatability between Informix products
Hi, I need some version compatability information for the following products. Hardware Platform: Hewlett Packard OS Platform: HP-UX version 10.20 Informix s/w: Informix Universal Server 9.20 Informix Dynamic Server 7.31 Informix Gateway to DRDA vers…
Re: checkpoints taking as much as 25 secs
Great answers from Peter, Obnoxio, and Lloyd. Yes you are seeing a bufwaits ratio of around 40% which is horrific, we need to try to get that under 10% with a preference for a value under 7%. Take Lloyd's or Obnoxio's recommendations for LRUS and CLEANERS and the LRU_MIN/MAX_DI…
Re: checkpoints taking as much as 25 secs
Try modifying your LRU's to something like 63. Make your page cleaners equal to your LRU's value. I find I get considerable performance from my server set this way. As well, checkpoints on high end machines running hundreds of users using ~10GIG+ databases range from 1 -2 secs. …
OPTIMIZER DIRECTIVES IN 4GL
Hello. I can use optimizer directives from dbaccess / Query Language, but they don�t work in a 4gl-program. The engine is IDS 7.30.UC2-1 and RDS-4GL is 7.20.UD7 on a SCO OpenServer 5.0.5. Example: select {+INDEX (tablename indexname)} * …
RE:
This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01BF35F3.75219B48 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 1. upgrade…
informix dynamic server on linux help
Hi all, I am an informix newbie, and i have problems running it on redhat linux 6.0. The installation went just fine, but now when i start dbaccess and try to create a new database i get this error message: 25584: Network driver can not access server program /opt/informix/lib/sq…
Informix Dynamic Server on IBM SSA
Can any one share their experiences, recommendations, pit-falls, comments about creating an IDS db engineOLTP environment on an IBM SSA Raid system? We have 2 SSA adapters and have 4 loops with 4 drives each. The IBM techs for the Smoothstart services will be coming next Tuesday…
AD-XP experiences ?
opt_goal did the job ... JVA a �crit dans le message <80cq7i$ape$1@wanadoo.fr>... >I'm running a DSS db with a classical star schema, and a typical "group by" >request gets 10 times slower when adding the sixth label table (50 rows >only) ... The doc says AD-XP module can help …
Please help me!
Hello! 1, Can somebody give me information, what is the new features for Version 7.24 of Informix Dynamic Server according to Version 7.20 of Informix Dynamic Server? 2, Are Version 7.20 of Informix Dynamic Server and 7.20 INFORMIX-ESQL/C 2000 Year Compatible? 3, W…
query optimizer (set explain) question
i've run set explain on three different systems (all hpux 10.20 with informix ds 7.3 uc2) the databases in question are the same schema (tables and indexes, same onconfigs, etc.) on each machine (however number of rows in each table varies. I ran set explain on each machine with…
Re: URGENT! How many rows will be returned?
I smell a troll here... Different databases use different technologies for query optimization and some are far better than others. Some 'so-called' optimizers need subtle hints to steer queries while others produce cost estimates based on statistics. Each database on your cros…
Re: installing Informix dynamic server
From: "Joerg_Mauz@abs.org" <Joerg_Mauz@abs.org> > Is there something wrong the the gateway, Hotmail or are there just loads of idiots posting today. (Apart from me, that is! :-) ______________________________________________________ Get Your Private, Free Email at http://www.hot…
installing Informix dynamic server
hi all, can anybody give me an URL where to find a good description of how to setup and install an Informix Dynamic Server with using RedHat Linux ??? I've searched a whole day but founf nothing useful.. :( thx ind advance joerg…
Help! Cant start database service
Hello All I had my informix dynamic server (7.3) running fine till a few days back. Now the dynamic server service and the informix messenger service won't start automatically and if I try to start the server, it does start but I'm unable to connect to it. If I try to start the…
Re: Single CPU Performance Problems?
From: "Gregory P. Schin" <gps@lucent.com> > >I need some help tuning a single processor Sun Microsystems Ultra 5 >system with 256 meg of memory running IDS 7.3 and Solaris 7. We have an >application written in Java that frequently loads large amounts of data >into the database.…
RE: Prepared statement vs Exec sql insert/update/select
> Is there any benefit to preparing and executing sql statements > rather than just having them in an exec sql insert/update/select.... [Bill Raper] In the Informix world, there is a very significant benefit. This is in the fact that the optimizer processes are run only once …
Optimizer not using index
Joerg Spilker wrote: > Hello, > > we´ve some strange problems with index selection on queries on our > Digital Alpha server with Online dynamic server running (7.24 FC6) and > 4GL developement tools (7.20 UD6). > > You can look at the example below. Only when using the select wi…
Re: Check points extremely , extremely long & other issues
From: "pankaj" <pankaj.patel@punks.demon.co.uk> > >I know I have to increase number of CLEANER to the same value as the LRS. Just make sure the number is not a power of 2. Like 16, say. :-) Try 17. How many disks are on the machine. >NETTYPE soctcp,2,200,CPU # Configur…
Informix Online Dynamic Server DBA Book
Hello Could anyone recommend a good Informix Online Dynamic Server book. I did a search in Amazon.com but I could not decide on which one to choose. Thanks in advance. Ajay…
One HUGE Query - any optimizers?
This is a multi-part message in MIME format. ------=_NextPart_000_0082_01BEF4B3.58C19EC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I've developed a program which constructs the following query and then = executes it. INSERT INT…
pricing for informix info?
Hello, Was wondering what other people out there paid for informix dynamic server 7.3... Basically, i wanted to know if they had a web server licensing schem like microsoft. or ibm's db2 (per cpu license). and would the licenses be transferable if I decided to move from le…
Re: Determining version dynamically
Hi, If you have Informix Dynamic Server then use the following sql-statement ' select DBINFO('version', 'full') from systables where tabid = 1' result from the sql is : Informix Dynamic Server Version 7.30.UC5 Take a look in Informix Guide to SQL: Syntax for more about DBINFO…
KAIO: out of OS resources error
Hi~ My informix dynamic server write "KAIO: out of OS resources error .." in online.log. This error log is written during ontape task. How can I solve this problem? platfom : SunOs 5.5.1 Informix Dynamic Server 7.24 uc6 Thanks.…
64bit IDS for Solaris 7/SPARC ?
Is there a 64bit Informix Dynamic Server 7.3x for Solaris 7/SPARC available? tia, joerg…
Posting from the Informix-list
what is the last version of Informix Dynamic Server for HP-UX 10.20, where can i find more Information about this.…
Latest versions for various Informix products ???
Which are the latest versions for Informix Dynamic Server Informix Dynamic Server, Workgroup Edition Informix 4GL Informix SQL on Solaris 7/SPARC ? Where can I find such informations on Informix's website ? tia, joerg…
Re: Help optimizing query (newbie)
Just a quick thought. If you are using transation logging it will be worth will creating the temp table with the no log option so it does not to any transaction logging. Nayan Jain wrote in message <7lapvi$3im$1@news.xmission.com>... > >Hi ! > >Just thought of correcting one thi…
cdr command line utility in informix 7.24
Hi, Is there a cdr command line utility in informix dynamic server 7.24? I tried to locate it, but the executable is nowhere to find. Thanks, Lu…
Optimizer question
Hi all, Informix Dynamic Server Version 7.30.UC6 Can someone please tell me if the optimizer takes into account the number of extents for tables when deciding on a query plan? Thanks Steve _______________________________________________________________ Get Free Email and Do …
Problem Installing Informix Dynamic Server
I downloaded a Try&Buy version of Informix Dynamic Server V7.30 for NT. I installed it on an NT Server. The install seemed to go ok, but after a short time of investigating IECC, I got a blue screen. After this when I started the Command Center, a task seemed to start, but it w…
Online index usage in one table query
In article <37861A36.3B9B6FAB@bloomberg.net>, kagel@bloomberg.net wrote: ..snipped > To the first > question, if your query is prepared with replaceable parameters the > optimizer does not know at prepare time when it is deciding on a query > plan what the actual values will be…
Re: Help optimizing query (newbie)
Hi ! Just thought of correcting one things here On Mon, 28 Jun 1999, Peter Sloboda wrote: > Frank T. Ramb=F8l wrote: >=20 > > Hi. > > > > I am trying to run the following statements on a rather huge database. > > > > =3D=3D > > begin work; > > set lock mode to wait; > > > > up…
Help optimizing query (newbie)
Hi. I am trying to run the following statements on a rather huge database. == begin work; set lock mode to wait; update tracked_ids set chk_count=-1 where image_id in (select image_id[16,26] from image_ids); delete from image_ids where image_id[16,26] in (select image_id fr…
Re: Indexing
John: The optimizer is a cost based optimizer and the order of items in the query will not matter unless you use optimizer directives. Now if the filter created by "a=? and b=? and c=? is not very selective, and the optimizer estimates that a large number of rows will be returne…
SQL performance
Shaun Campbell wrote: > > I have a query regarding something we have noticed using New Era and > wondered whether it a bug in New Era or is related to the database. > > In New Era we have been preparing SQL Select statements with ? > placeholders so that we could use the same pre…
Informix performance Issues
OK here goes. Dinkar Rane wrote: > > We are facing serious informix performance issues, to the extent that > usres are not willing to use the system. > The system is a data warehouse implementation. The data size including > indexes etc. is about 8 G. It is running on Sun E10K w…
Problems starting IDS 7.30.TC7 on Windows NT SP4.
When i try to start informix dynamic Server, the following message appears "Only informix user can start informix dynamic server" this message appears when i logged on with the informix's user. When i try to start the service on the control panel , error 2140 appears.…
Re: Here is a weird one, Not using fragmentation scheme to do fragmentation
Using MOD() to simulate the hash function is a good idea but when you're using the SELECT statement, if you want fragment elimination you cannot use MOD() or any other functions on the fragmented columns. Informix only supports RANGE or EQUALITY expression to eliminate fragment. …
Here is a weird one, Not using fragmentation scheme to do fragmentation elmination
I have a table that looks like this create table mytesting ( fnmae char(30), lastname char (30), i_guest_id int ) fragment by expression (mod(i_guest_id , 14 ) = 0 ) in dbspace13, (mod(i_guest_id , 14 ) = 1 ) in dbspace15, …
7.30UC2 - Subquery uses Autodindex instead of Index
Richard Peterson wrote: > > Hello, > > I have this problem after upgrading a server from 7.20 to 7.30UC2. The > optimizer appears to process subquerys diffrently when the in clause is > used. Rather than using the index on the table used in the subquery it uses > an autoindex ins…
Out of buffer?
Hi, I got the following error message from an Informix IDS 7.30: <<Informix Dynamic Server>>> WARNING! Buffer pool size may cause Dynamic Server to get into a locked state. Recommended minimum buffer pool size is 4 times maximum concurrent user thre…
Linux VS NT4.0
Hi, Is it true that Informix Dynamic Server workgroup edition 7.30 is ported for Linux, and if it is so does anyone can tell me what to chose between Linux and NT4.0 for running Informix Dynamic Server workgroup edition 7.30. Also I'd like to know for which version of Linux, Inf…
Starting Informix Dynamic Server !
Hi Gurus, Just wondering is there any difference in starting the informix engine as root user versus as Informix user. ? The reason why I ask this question is , the IDS 7.23 UC6 on HP-UX 10.2 crashes due to a bug (declared as bug by Informix Technical support)when we start in…
Informix Dynamic Server Archive/Restore
Hello All: We have a large scale Informix DB resident on an HP 9000, K460, with AutoRaid Disk Subsystem (218gb). And we are running IDS 7.30. Currently, we are using the Informix ontape archive/restore utility to archive the DB and to perform continuous logical logging. We u…
Re: Severe Performance Problem - Infomix 7.3 WGS & HPUX 10.20
eric wrote: > > We're in the process of upgrading from Informix 5 to Informix 7.3 Workgroup > Server but are experiencing severe performance problems. Some programs > which used to take 5 hours to complete are now taking 19 hours, on identical > hardware with identical indexing …
Any one know this?
Hi folks: Is there a script that can check informix on-line dynamic server is up and running or not? If not it will e-mail a note to D.B.A. groups Thanks in advance Garry…
Re: SeqScans Statistics 7.3_uc6
Hi again Matt, I am using 7.30.UC6 on HP-UX 10.20. I had very bad performance before installing HP patches (and mainly PHKL_16751). Could you tell me on wich system does your Informix DS run ? David... ----- Message d'origine ----- De : <mattb5@ozemail.com.au> � : <informi…
SeqScans Statistics 7.3_uc6
Hi Heidi, We have just upgraded from Informix 7.24_uc6 to Informix 7.3_uc6 on HP 10.20 and are experiencing similar problems to the ones you described. After the upgrade we ran our standard update statistics script (medium for table distributions only, high and low, etc) and fo…
Re: anyway to optimize this query?
>query only. Well, then, why not create all possible index combinations? :-) >Obnoxio The Clown wrote: > >> Sometimes it helps to treat a 2 CPU box as a single CPU box. Have you >> tried this? >> >> >PHYSBUFF 32 # Physical log buffer size (Kbytes) >> >LOGBUF…
Re: anyway to optimize this query?
query only. Obnoxio The Clown wrote: > >let's see... > > > >there are 61772773 rows in the table. > > > >The table is indexed on three fields, let's call it f1,f2,f3, it is a > >composite index, the reason I do that is because > >there is also a where clause in the query which…
Re: anyway to optimize this query?
>let's see... > >there are 61772773 rows in the table. > >The table is indexed on three fields, let's call it f1,f2,f3, it is a >composite index, the reason I do that is because >there is also a where clause in the query which uses all three fields as >criterias. > >update satis…
Re: anyway to optimize this query?
let's see... there are 61772773 rows in the table. The table is indexed on three fields, let's call it f1,f2,f3, it is a composite index, the reason I do that is because there is also a where clause in the query which uses all three fields as criterias. update satistics was p…
Re: anyway to optimize this query?
>hi all: > I have a 16 gig database, each record is contains 50 fields. > I am running a query like this: > > select f1,f2....f15, sum(f40),sum(f41),sum(f42), sumf(43) > group by f1,f2...f15 > > as you see, i have to group about 15 fields and sum 4 other fields >ba…
anyway to optimize this query?
hi all: I have a 16 gig database, each record is contains 50 fields. I am running a query like this: select f1,f2....f15, sum(f40),sum(f41),sum(f42), sumf(43) group by f1,f2...f15 as you see, i have to group about 15 fields and sum 4 other fields based on th…
converting Informix Online 5.1 esql/c to Dynamic Server esql/c?
Hi converting Informix Online 5.1 esql/c to Dynamic Server esql/c? What is the easiest way to do this? Is there a parser that could do this? edward…
RAID Technolgy
We are using Informix Online Dynamic Server 7.2. We are going in for a new DEC UNIX Server with RAID Technolgy. It incorporates mirroring at the hardware level. So is it not necessary to do mirroring using Informix?. Can anybody give suggestions regarding mirroring and other feat…
composite index question
Yan Zhu wrote: > > hi all: > If I put a composite index on three fields, a,b,c, what kind of > query would this benefit? > > I made a few queries with differenct criterias, and set explain on, > this is what I discovered. > 1. if the criteria is only on a or b or c, i…
Informix on Linux
Does anybody know how much a copy of Informix Dynamic Server would run me for use on Linux?? Thanks in advance -steve…
Upgrade Dynamic Server 7.13 - 7.24
I need to upgrade Informix Dynamic Server version 7.13 to version 7.24. Can anyone advise of any problems they may have had whilst doing this?…
Informix Dynamic Server 7.31?
Is any information available regarding the release of IDS 7.31 for Unix? We have Sun E3000 and E4000 machines and are experiencing problems with both 7.30.UC3 and 7.30.UC5 and are curious about 7.31. Thanks. Carleen Avant Naval Safety Center Internet < cavant@safecen.navy.mil …
STRING FUNCTIONS
Are there functions for manipulating varchar type, like upper() or lower() in Informix Online Dynamic Server 7.2? Thanks in advance.…
Re: Flushing Cache
Bryan Hughes wrote: > > Does anyone know a way to flush cache in Online 7.2x short of a) writing a > huge query, and b) cycling the engine? I am trying doing to query > optimization and need to do raw timing of the same query written in > different ways. Shut the engine down an…
Netscape Enterprise Connection for Informix Dynamic Server
Hi: Does anyone know the procedure for setting up a Netscape Enterprise Server to connect to an Informix Dynamic server on a remote machine? Michael…
oninit: shared library problem
I'm having problems when initialising the DB using oninit. Config: INFORMIX Dynamic Server Ver 7.23, on a UNISYS-UNIX SVR4. When Initializing, I get the error ...dynamic linker: oninit: symbol not found: gettimeofday The LD_LIBRARY_PATH is set to $INFORMIXDIR/bin and �INFORMIXDIR…
Initi DB
I'm having problems when initialising the DB. Config: INFORMIX Dynamic Server Ver 7.23, on a UNISYS-UNIX SVR4. When Initializing, I get the error ...dynamic linker: oninit: symbol not found: gettimeofday The LD_LIBRARY_PATH is set to $INFORMIXDIR/bin and �INFORMIXDIR/esql help wo…
Re: Matches not Work in 7.30
We had the same problem and I even opened a case up with Informix (and yes, we did update statistics). In our case, and probably yours as well, the matches does work, it just takes forever to come back with any rows. It turns out that it was related to the new sub-query flatten…
Re: Problem with Informix 7.3 I need a good Idea very soon
Bundesarchiv wrote: > > E posibile > to mark a table (a priori) as "AVOID_FULL"(scan) ?? > > or (i.e. with UPDATE STATS) "near fullscan disabled" ?? > > (in Informix 7.3) > > I need a good Idea very soon See other posts. Also have you tried OPT_GOAL=0 which can be set in the ap…
Re: Problem with Informix 7.3 I need a good Idea very soon
Hi Klaus, in this case you will have to deal with the different levels of update-statistics, until you get what you want. Try to do "typical" queries after 'set explain on;' in dbaccess and try to figure out, why the optimizer takes a full-table-scan. hth martin Bundesarchiv sch…
Index on Informix Online 7.22 ?
I have installed a new Informix Online Dynamic Server 7.22UC3 on our server (HP-UX 10.20). I find it is much much slower than the Informix 7.12 Online DS server if I do not create index for a same program. Why and what is the difference between the two version of Dynamic serv…
Assertion Failure at ok
07:52:16 Assert Failed: Memory block header corruption detected in mt_shm_mallo c_segid 2 07:52:16 Informix Dynamic Server Version 7.30.UC3 07:52:16 Who: Session(847, informix@, 0, 0) Thread(17, soctcplst, 0, 1) File: mtshpool.c Line: 2455 I am constantly having this problem …
Assertion Failure at ok
07:52:16 Assert Failed: Memory block header corruption detected in mt_shm_mallo c_segid 2 07:52:16 Informix Dynamic Server Version 7.30.UC3 07:52:16 Who: Session(847, informix@, 0, 0) Thread(17, soctcplst, 0, 1) File: mtshpool.c Line: 2455 I am constantly having this problem …
Re: esqlvers statement.....results are different on 2 DB servers ???
Tim Jones wrote: > > I've installed Informix 7.30UC3 with the ClientSDK 2.01 software on 2 > servers. Let's call them Server A and B. > > Both A and B had a prior ESQL/C versions. > > After the install, logged in as informix userid on A and ran "esqlvers" > and got this : > I…
esqlvers statement.....results are different on 2 DB servers ???
I've installed Informix 7.30UC3 with the ClientSDK 2.01 software on 2 servers. Let's call them Server A and B. Both A and B had a prior ESQL/C versions. After the install, logged in as informix userid on A and ran "esqlvers" and got this : INFORMIX-ESQL Version 7.22.UC1 …
Informix Dynamic Server Personal Edition
What development apps are known to work with IDS-PE for 95? Infrmx wants to sell me licenses for Dynamic 4gl, esql-c, ddvb for 150usd. Do these work and are there others? 150 sounds ok but the catch is is that the Open-Line Support is outrageous for this (3K usd for unlim. suppor…
Will informix 7.24.uc5 compatiable with solaris 7?
Hi there, I was wondering if Informix Dynamic Server 7.24.uc.5 will be compatiable with solaris 7 when it comes out? Thanks advance, Pat Militzer pmilitzer@ultracom.com…
Informix Online Dynamic Server 7.2.2
When I try to iniailize the shared memory I get an error "oninit: Critical error initializing shared memory" I checked the log and it says the base memory address is 0x80080000 and should be 0x80400000 when I change it it reverses. this is on a SCO open server 5. nay ideas.…
Informix Dynamic Server on Linux NOW!
Check out the Informix WEB Site. There is an announcement that IDS 7.3 is shipping on Linux TODAY! http://www.informix.com/ Art S. Kagel…
Problem installing to NT4.0 server
I'm trying to install Informix dynamic server workgroup edition to Primary domain Nt 4.0 Server. I have created Informix-Admin group and Informix account and grant it all Administrators rights and also Domain administrator rights. The server setup runs ok, but when setup is tryi…
Re: Distributions
Stefan Weideneder wrote: > > Jay Aymond wrote: [SNIP other stuff] > Do you think it's a good idea to give the optimizer detailled > informations for columns, if the information will not cause > a better query plan ? Don't you believe that it will slow down > those queries that d…
Deployment Licenses of Informix Dynamic Server
I need a free Deployment Licenses of Informix Dynamic Server!…
Re: Informix Dynamic Server blocks
In article <3609EB18.2AB1B1CD@bull.net>, Helmut Leininger <Helmut.Leininger@bull.net> writes >Hi, > >Sporadically, the Informix server seems to block (every try to connect >or onstat times out and no reaction on onmode -ky). In the MSGPATH I >find the following message: > >09:03:…
Informix Dynamic Server blocks
Hi, Sporadically, the Informix server seems to block (every try to connect or onstat times out and no reaction on onmode -ky). In the MSGPATH I find the following message: 09:03:42 mt.c, line 8362, thread 2139, proc id 17096, mt_notifyvp timed out. Informix server is 7.22.UC2…
Informix Dynamic Server blocks
Hi, Sporadically, the Informix server seems to block (every try to connect or onstat times out and no reaction on onmode -ky). In the MSGPATH I find the following message: 09:03:42 mt.c, line 8362, thread 2139, proc id 17096, mt_notifyvp timed out. Informix server is 7.22.UC2…
Re: SET EXPLAIN / SQL
Stefan Weideneder wrote: > > Hi David, > > as Sujit mentioned already, the results of SET EXPLAIN are > available as soon as you prepared your query. > This is not always true, but in most cases. > > If the query contains no question-mark "?", your query will > be optimized at th…
Re: 7.23 UC4 vs. 7.30 UC3
snip... > >> Also, Oyvind, we have experienced the wrong query path being selected by the > >> optimizer is 7.x for some time. We understand that 7.30 allows the user (us) > >> to control the query optimizer more directly. > > > >Yes, we have used this feature to verify that the …
Re: SET EXPLAIN / SQL
I am not sure but you can use Optimizer directives to select adhoc query plan. For more information about optimizer directives, you review the presentation slides about informix performance optimization by Kevin Fennimore on the following URL location (thank you Kevin). Good luck…
Re: Infromix & Data Warehousing Solutions
Doug Johnson wrote: > > Tim, > > Thanks for the info but we're not on the same page. I'm not talking about > the Informix query optimizer (access plan shown by 'explain plan'). There's > tons of info on www.informix.com on that optimizer. I'm talking about the > new MetaCube Ware…
Re: Infromix & Data Warehousing Solutions
Tim, Thanks for the info but we're not on the same page. I'm not talking about the Informix query optimizer (access plan shown by 'explain plan'). There's tons of info on www.informix.com on that optimizer. I'm talking about the new MetaCube Warehouse Optimizer. My understanding…
Re: OnLine Dynamic Server 7.2 Vs INFORMIX Dynamic Server 7.3
On Tue, 28 Jul 1998 14:40:44 -0500, Ben Jazi <bjazi@fallschurch.esys.com> wrote: >What are the major differences between INFORMIX-OnLine Dynamic Server >7.2 and INFORMIX Dynamic Server 7.3? Is it ORDBMS vs RDMBS? No, IDS 9.x is the ORDBMS. This autumn the 7.3 and 9.x code lin…
Re: OnLine Dynamic Server 7.2 Vs INFORMIX Dynamic Server 7.3
Ben Jazi wrote: > > What are the major differences between INFORMIX-OnLine Dynamic Server > 7.2 and INFORMIX Dynamic Server 7.3? Is it ORDBMS vs RDMBS? > > Thanks, > Ben I don't know the differences in detail but you could check the following pages, where IDS 7.3 is described …
OnLine Dynamic Server 7.2 Vs INFORMIX Dynamic Server 7.3
What are the major differences between INFORMIX-OnLine Dynamic Server 7.2 and INFORMIX Dynamic Server 7.3? Is it ORDBMS vs RDMBS? Thanks, Ben…
Informix computer Base classes
Has any body used the Informix computer base training classes. I am wondering if any of the computer based training classes: "Informix Dynamic Server System Administration" or the "Managing and Optimizing Informix Dynamic Server Databases" is good. Thank You…
Re: Informix Online Dynamic Server 7 on Linux
Piet le Roux wrote: > > If anyone has succeeded to run Informix ODS 7 (SCO) on Linux help would > be appreciated. > I have installed iBCS and the shared libraries and the binaries work, > except that the engine cannot initialize shared memory: Error message > semctl: errno 22…
Informix Online Dynamic Server 7 on Linux
If anyone has succeeded to run Informix ODS 7 (SCO) on Linux help would be appreciated. I have installed iBCS and the shared libraries and the binaries work, except that the engine cannot initialize shared memory: Error message semctl: errno 22 create_vp: cannot allocat m…
Problems with Informix Dynamic Server for NT
Hi Has anyone tried downloading and running the dynamic server product for NT? I have it installed, but get the following error when I boot the system: AdmAgent.exe - Applicatioin error The instruction at "0x10087c69 referenced memory at "0x00000000". The memory could not be r…
RE: What are the differences between Informix Dynamic Server
It is confusing! =20 Here's what I know: Prior to renaming: 7.2x =3D ODS 8.0 =3D XPS 9.1 =3D IUS After renaming: 7.2x =3D IDS 8.0 =3D IDS/AD/XP 9.1 =3D IDS/UDO=20 After the 7.3 release: 7.3 =3D IDS 9.1 =3D IDS/UDO After the 8.2 release: 8.0 =3D…
RE: What are the differences between Informix Dynamic Server and
This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------ =_NextPart_001_01BDA3AF.9242A58C Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Good quest…
Re: query optimizator
>Something strange happened to me (is not the first time) with >Informix OnLine 7.2 on UnixWare 2.1.1 with dual Pentium 133. >A query that we use frequently, suddendly stopped working. >The query optimizer decided to change something, and the query now >do not use anymore the rig…
Re: query optimizator
Marco Traini wrote: > > Something strange happened to me (is not the first time) with > Informix OnLine 7.2 on UnixWare 2.1.1 with dual Pentium 133. > A query that we use frequently, suddendly stopped working. > The query optimizer decided to change something, and the query now >…
query optimizator
Something strange happened to me (is not the first time) with Informix OnLine 7.2 on UnixWare 2.1.1 with dual Pentium 133. A query that we use frequently, suddendly stopped working. The query optimizer decided to change something, and the query now do not use anymore the right in…
Re: Index for Informix Dynamic Server
William Lai wrote: > > Hello, > > We alreay upgrade our database server from SE5.X to IDS 7.3. After we > convert all the old data to the new server, we have some problems on the > index search. For example, a table: > > table : ith ( ithitno, ithname ), total 1,500,000 records…
Re: Index for Informix Dynamic Server
William Lai <rwie@netvigator.com> offerred: +We alreay upgrade our database server from SE5.X to IDS 7.3. After we +convert all the old data to the new server, we have some problems on the +index search. For example, a table: + +table : ith ( ithitno, ithname ), total 1,500,000…
Index for Informix Dynamic Server
Hello, We alreay upgrade our database server from SE5.X to IDS 7.3. After we convert all the old data to the new server, we have some problems on the index search. For example, a table: table : ith ( ithitno, ithname ), total 1,500,000 records index : ith_1 on ithitno, ithn…
Re: I can't think of the subject name (have not words).
David Williams wrote: > > In article <35633efd.202294607@nntp.news.netcom.net>, David Kosenko > <davek@summitdata.com> writes > >Leonid Vorontsov <Leonids.Voroncovs@dati.lv> offerred: > >+OPTCOMPIND 0 > >+OPT_GOAL 0 > > What is OPT_GOAL ??? New 7.3 CONFIG file parameter to s…
Re: I can't think of the subject name (have not words).
David Williams <djw@smooth1.demon.co.uk> offerred: +>+OPTCOMPIND 0 +>+OPT_GOAL 0 + + What is OPT_GOAL ??? It is both a config parameter (in $ONCONFIG) and environment variable. Setting it to -1 is the default behavior (ALL_ROWS). Setting it to 0 (FIRST ROWS) means the optim…
Informix Dynamic Server 7.3
Hello, Since I'm planning a Data Warehouse, I would to do it with the new version of Dynamic Server. Impressions, stability and on which platform? Regards. Fernando _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ Fernando Collalti Phone: +…
Re: I can't think of the subject name (have not words).
David Kosenko wrote: > "Art S. Kagel" <kagel@bloomberg.net> offerred: > +> > An annoyed Informix user wrote: > +> Do You see index3 on table1(field1, field2)? There isn't sorting > needed. > +WRONG WRONG WRONG! > +> There isn't table reading needed too. index3 contains all > …
Re: I can't think of the subject name (have not words).
"Art S. Kagel" <kagel@bloomberg.net> offerred: +> > An annoyed Informix user wrote: +> Do You see index3 on table1(field1, field2)? There isn't sorting needed. + +WRONG WRONG WRONG! + +> There isn't table reading needed too. index3 contains all information +> queried and in righ…
Re: I can't think of the subject name (have not words).
Leonid Vorontsov wrote: > Hi, All! Next problem with IDS 7.30.TC2 for NT (ooh...). > I have table with 200000 rows (approximately): > CREATE TABLE table1 ( > ... > field1 CHAR(11), > field2 CHAR(120), > ... > ); > I have indexes: > CREATE INDEX index1 ON tabl…
Re: Data binding
"Art S. Kagel" <kagel@bloomberg.com> offerred: +Yes. Versions before 7.3 resolved the query path at PREPARE time so, +except for an EXECUTE IMMEDIATE (which prepares and executes at the +same time), these two queries MUST be treated differently. Since the +actual value of the…
Re: I can't think of the subject name (have not words).
In article <35633efd.202294607@nntp.news.netcom.net>, David Kosenko <davek@summitdata.com> writes >Leonid Vorontsov <Leonids.Voroncovs@dati.lv> offerred: >+OPTCOMPIND 0 >+OPT_GOAL 0 What is OPT_GOAL ??? -- David Williams Maintainer of the Informix FAQ Primary site (Beta V…
Re: I can't think of the subject name (have not words).
Leonid Vorontsov <Leonids.Voroncovs@dati.lv> offerred: CREATE TABLE table1 ( field1 CHAR(11), field2 CHAR(120), ); CREATE INDEX index1 ON table1 (field1); CREATE INDEX index2 ON table1 (field2); CREATE INDEX index3 ON table1 (field1, field2); CREATE INDEX index4 ON table…
Re: I can't think of the subject name (have not words).
David Kosenko wrote: > > Leonid Vorontsov <Leonids.Voroncovs@dati.lv> offerred: > > CREATE TABLE table1 ( > field1 CHAR(11), > field2 CHAR(120), > ); > CREATE INDEX index1 ON table1 (field1); > CREATE INDEX index2 ON table1 (field2); > CREATE INDEX index3 ON table1 (field…
Re: Optimizing a select query
Sujata, Try creating the following index on tab2 (col2, col1). This way it will only need to do an index read. Also run update statistics high (if SQL/Server has the concept). Regards David Ashby ______________________________ Reply Separator _…
Optimizing a select query
Hi everyone, Here is a question for you guys. I am facing a problem with a simple select query running toooo slow. Before I proceed, let me explain that I am facing this problem in SQL Server not in Informix. I know the die-hard Informix fans will say "Well... there is your a…
Informix Dynamic Server & Text columns
Hi everybody, Can you help me ? I've created a table with the following structure : column type -------- ---- code smallint obs text How can I insert into this table with Java program ? I'm using Informix Java AP…
Intermittent Problem - error 529 Cannot attach to transaction
We have a HP-UX box (Ver 10.20) running Informix Online Dynamic Server Ver 7.13 and a NT Server (NT4.0) running Informix Online Dynamic Server Ver 7.23. We are trying to access some of the database tables resided in the HP-UX box from the NT Server via synonyms. But we faced inte…
Re: Optimizing..
In article <6gc0fc$qe1$1@news.xmission.com>, "ABEL ROJAS GARCIA" <abelrg@bital.com.mx> writes: > > Hi, > > What can I do for Optimizing queries? > > > Thanks How about giving an example of query you'd like optimized.…
Re: Optimizing..
Go to the Informix Advanced Development and OnLine Administration classes. They're a definite investment. Either that or do some SERIOUS reading. Vij. ABEL ROJAS GARCIA wrote in message <6gc0fc$qe1$1@news.xmission.com>... > >Hi, > >What can I do for Optimizing queries? > > >Th…
Optimizing..
Hi, What can I do for Optimizing queries? Thanks…
Re: Update statistics of the informix.xxx tables.
>Is the update statistics scenario of the informix.systables alike tables >of a database the same as for the users tables. ? For the most part the access to these tables use a "fixed plan". Since this information is mainly needed by the optimizer to generate the query plan, we …
How can I read the header tape of the archive created by ontape?
I have Informix Dynamic Server 7.23.UC1. I would like know the tape header structure created by ontape.…
Re: Prepare a Statement that uses a temporary table?
Georg Winkens wrote: > > Is there a way in ESQL/C to prepare a Statement that uses a temporary > table (e.g. "Select * from Temp_Table ...") if this temporary table is > not already created at prepare time? No there is not. The purpose of preparing a statement is to save the co…
Re: Optimizer Info
>Are there any ways to know how the optimizer is evaluating all the >possible query plans and how it decides which one it chooses. > >I know about 'set explain' and data distributions and such, but is there >a way to see the process >the optimizer went through. Basically, no. T…
Optimizer Info
I am running 7.1 on Solaris 2.5 (soon to be upgrading to 7.24). Are there any ways to know how the optimizer is evaluating all the possible query plans and how it decides which one it chooses. I know about 'set explain' and data distributions and such, but is there a way to see…
Re: Query Optimizer
>Help me please! >I need information about algorithm of Query Optimizer. >Informix Engine - OnLine Dynamic Server 7.10 One can write a book on this topic. Basically, the optimizer looks at all possible ways of scanning every table in a query. The cost for each path is calculated…
Query Optimizer
Help me please! I need information about algorithm of Query Optimizer. Informix Engine - OnLine Dynamic Server 7.10 .…
Re: Upgrading Informix from Online engine to Dynamic Server
Seth Grimes wrote: > > Jane Vohden wrote: > > > > I have been talking with Informix about upgrading our site from the > > 5.xx Online engine to 7.2x Dynamic Server. They said there was no cost > > I don't think that anyone has pointed out the mistaken terminology > h…
What's the difference between ODS 7.22 and 7.23?
What's the difference between Informix Online Dynamic Server version 7.22 and version 7.23? Thanks in advance. Bill Westphal Rodney District Council mis@rodney.govt.nz…
ODBC unix and dynamic SQL
Hi, Can someone give me some help on using informix odbc drivers (unix) with dynamic SQL on Informix-online dynamic server (7.22 unix) when I use "SQLprepare" I receive the message "too many or too few host variables given" but I think all is Ok R. Gueye…
Re: DELETE does not use index
>Sorry for my stupid question, but what does UPDATE STATISTICS do in detail? No such thing as a stupid question. UPDATE STATSTICS updates information in the database catalogue, such as systables, sysindexes, sysdistributions. Information from these catalogue tables is read by …
Re: Stored Procedures and querries.
From "Incorporating Stored Procedures and Triggers into Your Informix Databases Training Manual" Version 01-95 Page 6-128: When a stored procedure is created all optimization will be attempted at that time. If the tables cannot be examined at compile time (they may not exist o…
Re: Running UPDATE STATISTICS on a table being used
sujata_soman_at_omm-la2-infotech-001@internet.omm.com wrote: > Since the update statistics was going on parallelly with the query, will the > query use the new plan once the update statistics is over or does it still go > with the old plan ?? The query is just taking for eve…
Re: Set explain use
>Not considering indexes, does it make any difference to the informix >optimizer > if we switch the order of conditions in a where clause. For example, which >one > is better: > >select * from A where p = q and r = s or >select * from A where r = s and p = q . > >None of p,q,r,…
optimizing - sqexplain
Hi, We are developing an application with New Era 2.20 using Online 7.10 (about to upgrade to 7.23). My goal is to optimize the response times and I'm new in that function. The first idea is to search through the access plan for high cost queries, the problem is that I don't kn…
Re: Query Optimizer
Dies ist eine mehrteilige Nachricht im MIME-Format. --------------7BAFAD1E691FD235D6CAD43F Content-Type: text/plain; charset=iso-8859-1 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Content-Transfer-Encoding: 8bit Hello Mauro, but there still exis…
Re: Query Optimizer
Mauro G. Pisano wrote: > > HI all: I recently heard about the possibility of upgrade de query optimizer. > I 've got ON-LINE 5.0 and at Informix Seminary, It was listened taht by > upgradin only the query optimizer, somes exposed queries at the seminary, > had down its times fro…
Query Optimizer
HI all: I recently heard about the possibility of upgrade de query optimizer. I 've got ON-LINE 5.0 and at Informix Seminary, It was listened taht by upgradin only the query optimizer, somes exposed queries at the seminary, had down its times from 30 minutes to seconds. I want …
Next Extent Calc.
Hi, I have INFORMIX-OnLine Dynamic Server Version 7.14.UD2. Does anyone know of a script or program to calculate the next extent size ? Thanks in advance Manuel…
Re: First N records in SELECT
Slavik Anosov wrote: > > Does anybody know something in Informix ODS 7.1 that perform functions of > Oracle's ROWNUM pseudo-column? I need to retrieve only first N records in > select. > No, there is no such feature. Assuming that you are using ESQL-C or 4GL you can simply close…
Re: Query Optimization question
Ignatius In version 7.x (not in 5.x) you can do: UPDATE STATISTICS MEDIUM FOR table(column) DISTRIBUTIONS ONLY The MEDIUM will do data sampling whether or not you create an index on the column. The DISTRIBUTIONS ONLY update the sysdistrib table in your database. In case you …
Re: Query Optimization question
On Thu, 10 Jul 1997, Ignatius Cristina Michelle wrote: > Hi. > > What statistical information can Informix draw upon to determine how > many rows will be satisified by a query coondition of the form "column = > value", for example, "department = 'D'" where "department" may or ma…
Query Optimization question
Hi. What statistical information can Informix draw upon to determine how many rows will be satisified by a query coondition of the form "column = value", for example, "department = 'D'" where "department" may or may not be an "indexed" column. Where is this statistical informati…
Java and Informix Dynamic Server 7.x
Hi friends! I am trying to do server-side java cgi programming to connect to I-ODS 7.x. Do you know how I can do that? I heard it is possible to use the jdbc-odbc bridge( intersolve or openlink's), but the performance is too slow, because of jdbc to odbc and odbc to jdbc convert…
Re: Set explain utility
>The sqexplain.out file exists immediately after the prepare. >Please, try it again. How can this be? At the PREPARE stage (for any real-life query) crucial information - values to use - are still missing. It is only at OPEN CURSOR when we tell the engine the values, and only t…
Re: DSA follies
> Correct - hold cursor declared with hold are not parallelized... > Several other types 'queries' are not parallelized - can't remember > which... Wow, what a coincidence! I just read a page on this in the Performance Tuning Training manual. Queries NOT parallelized: * Th…
Access to Optimizer results
We are using version 7.2 on HP-UX 10.10, and would like to know if there is any way to access to "cost" (from the optimizer) of a query while the query is executing without having the explain plan written out to a dataset. We are trying to develop a quey govenor that can be used…
Re: understanding On-Line's Optimizer
Steve Romankiw wrote: > > I am new the Informix On-Line engine. I am looking for information on > On-Line v7.13 Cost Based Optimizer. We are migrating to Informix from > SQLBase and the optimizers work differently. In informix, we often get > sequential scans on queries that w…
Re: understanding On-Line's Optimizer
At 10:05 AM 19-12-96 -0500, you wrote: >I am new the Informix On-Line engine. I am looking for information on >On-Line v7.13 Cost Based Optimizer. We are migrating to Informix from >SQLBase and the optimizers work differently. In informix, we often get >sequential scans on que…
Re: understanding On-Line's Optimizer
sromankiw@execrisk.com (Steve Romankiw) wrote: :I am new the Informix On-Line engine. I am looking for information on :On-Line v7.13 Cost Based Optimizer. We are migrating to Informix from :SQLBase and the optimizers work differently. In informix, we often get :sequential sca…
Re: understanding On-Line's Optimizer
On 19 Dec 96 at 10:05, Steve Romankiw wrote: > I am new the Informix On-Line engine. I am looking for information on > On-Line v7.13 Cost Based Optimizer. We are migrating to Informix from > SQLBase and the optimizers work differently. In informix, we often get > sequential s…
understanding On-Line's Optimizer
I am new the Informix On-Line engine. I am looking for information on On-Line v7.13 Cost Based Optimizer. We are migrating to Informix from SQLBase and the optimizers work differently. In informix, we often get sequential scans on queries that we feel should be using an index.…
Re: update stats resolution
Manoj Shroff wrote: > > Hi All, > > Does anyone have any guide lines for the use of the > resolution clause in "update statistics" ? Hi All, data distribution is an additional overhead for the optimizer. Therefore you should try to avoid data distributions whereever pos…
Re: Optimize A Simple Query -- Help
Chao Y. Din wrote: > > I have a simple select count statement that takes three minutes to > execute, yet I only have about 300,0000 rows. Here is the SQL. > > SELECT COUNT(*) FROM table WHERE key[1,7] = "B02800A" AND col1 = 2010 > > Is it possible to force the query to …
Re: Optimize A Simple Query -- Help
Chao Y. Din wrote: > > I have a simple select count statement that takes three minutes to > execute, yet I only have about 300,0000 rows. Here is the SQL. > > SELECT COUNT(*) FROM table WHERE key[1,7] = "B02800A" AND col1 = 2010 > AND col2 = 10; > [SNIP] > Is it possible…
Re: Optimize A Simple Query -- Help
At 08:29 AM 9/16/96 -0400, you wrote: }I have a simple select count statement that takes three minutes to }execute, yet I only have about 300,0000 rows. Here is the SQL. } } SELECT COUNT(*) FROM table WHERE key[1,7] = "B02800A" AND col1 = 2010 }AND col2 = 10; } }The "key" field …
Re: Optimize A Simple Query -- Help
tvarnas@compulink.gr (Apostolos Varnas) wrote: :Chao Y. Din wrote: :} :} I have a simple select count statement that takes three minutes to :} execute, yet I only have about 300,0000 rows. Here is the SQL. :} :} SELECT COUNT(*) FROM table WHERE key[1,7] = "B02800A" AND …
RE: Optimize A Simple Query -- Help
Chao Try creating an index on table (col1, col2, key). This should make the = optimizer utilize the index path. Also since col1 and col2 are highly = duplicate values, this will give the index some degree of uniquenss so = the optimizer finds it worth giving the new index a try.…
Re: Optimize A Simple Query -- Help
Chao Y. Din wrote: } } I have a simple select count statement that takes three minutes to } execute, yet I only have about 300,0000 rows. Here is the SQL. } } SELECT COUNT(*) FROM table WHERE key[1,7] = "B02800A" AND col1 = 2010 } AND col2 = 10; } } The "key" field is th…
Re: Optimize A Simple Query -- Help
Chao - have you tried "update statistics medium..." or high...? That might induce the optimizer to choose the more discriminating index. If you're running "low", the optimizer is flying pretty blind when it comes to data distributions. Greg Chao Y. Din wrote: > > I have a s…
Optimize A Simple Query -- Help
I have a simple select count statement that takes three minutes to execute, yet I only have about 300,0000 rows. Here is the SQL. SELECT COUNT(*) FROM table WHERE key[1,7] = "B02800A" AND col1 = 2010 AND col2 = 10; The "key" field is the primary key with data type char(11). …
Re: Update Statistics Low, Medium & High
billy@west.co.za (Billy Wheeler) wrote: :> >In our system, we discover sometimes some tables in index searching is much :> >faster while we update their statistics low or medium instead of high. :> I heard a discussion the other day which indicated that when you update :> stati…
Re: Update Statistics Low, Medium & High
Clem Akins wrote: > > >In our system, we discover sometimes some tables in index searching is much > >faster while we update their statistics low or medium instead of high. > > > >We have an idea that update all tables high statistics with reference to the > >server admin. guide.…
Informix Certified Professional Program Update
Informix offers two certification paths. Each path requires the successful completion of two exams. Each exam is US $250 and is between 60-90 minutes long. * Database Specialist for INFORMIX-OnLine Dynamic Server 7.x 111 - Database Fundamentals Exam 112 - Managin…
Set Explain with SP's
In attempting to determine how the optimizer is processing queries in stored procedures, we've tried turning 'set explain on' within a procedure. However, when executing the procedure, I get an empty file. Is there anything special which needs to be done, to get set explain outp…
Re: EXPLAIN result diff. in TEST and REALITY
: In our TEST DB the result of a joined query and SET EXPLAIN is INDEX PATH : for the two tables. On our REAL enviroment this result is for one table : is SEQUENTIAL SCAN, and for the other one is INDEX PATH. Is this normal ?? : The query is awful slow, maybe thatsway ?? Hi, am…
Re: INFORMIX-Online Dynamic Server intallation
copy the standard onconfig file and make as few changes as possible to the different parameters. after you are sure you can bring informix online, should you begin to make changes to the onconfig parameters. Use ONMONITOR to make the changes. It will protect you from many mista…
INFORMIX-Online Dynamic Server intallation
I'm about to install INFORMIX-Online Dynamic Server V.7.1 on a SPARC 1000. Has anyone installed this database on a sparc before? If yes...do you have any suggestions or could you give me any advice on certain aspects of the installation you felt might be important to take notice?…
Re: Distributed Join
>I remain very sceptical. To optimize a join across multiple vendor databases >requires that your 'joining' product must fully familiar with all >the individual optimizers in each database to understand how they will process >their portion of the query. Next it must be familiar…
about INDEX
Good day people, somebody could tell me which is the use of INDEX and one example. I think that with INDEX, I can to optimize my querys in 4gl, thanks in advanced. Atte. German Velazquez…
Re: Query Optimising Problem !!
Optimizing a query can be very quick once you type set explain on and then run your query. The output will tell you how the optimizer has decided to process your request: it will show you what indexes it uses, what filters and when it is doing a sequential read. It can be su…
Re: Query Optimizing Problem !!
In article <3i16po$c1s@raffles.technet.sg>, Alan Chen <sgs@technet.sg> wrote: >I have never done any query optimization practise in Informix Online >before, can anyone provide me some pointers ?? Any good reference book ?? >Any idea will be appreciated. > >Thanks in Advance. > >A…
Re: Optimizing Many-Table Joins
mmueller@calvin.bellahs.com (Michael Mueller RD) writes: >Can anyone tell me the tactics that the query optimizer uses for >optimizing joins, especially queries joining a large number (e.g. >4) >of tables? What is the max number of tables allowed in a query? >How does this comp…
Optimizing Many-Table Joins
Can anyone tell me the tactics that the query optimizer uses for optimizing joins, especially queries joining a large number (e.g. >4) of tables? What is the max number of tables allowed in a query? How does this compare to Sybase's handling? Thanks! --Michael mmueller@bella…
RE: Optimize Query for slow responce
> 26-Oct-1994 > >I can not understand the Informix Query Optimizer ! >--------------------------------------------------- > > >I have a fine large table and I create a query, where I select all fields from >the table. To lookup the records I have an unique index on a field…
Re: Optimize Query for slow responce
In article <38lia4$97d@emory.mathcs.emory.edu>, pp@q8.dk (Poul Pedersen) says: > > 26-Oct-1994 > >I can not understand the Informix Query Optimizer ! >--------------------------------------------------- > > >I have a …
Re: Optimize Query for slow responce
In article <38lia4$97d@emory.mathcs.emory.edu>, pp@q8.dk (Poul Pedersen) writes: |> Now look at the Optimizer Query Plan: |> |> |> QUERY: (LOW) |> ------ |> select * from ks_gdkonto |> where gd_kontonr = "0003573508" |> and gd_prod_kode < 90000 |> |> |> Estimated Cost: 2 |> Es…
RE: Optimize Query for slow responce
} 26-Oct-1994 } }I can not understand the Informix Query Optimizer ! }--------------------------------------------------- } } }I have a fine large table and I create a query, where I select all fields from }the table. To lookup the records I have an unique index on a field…
Optimize Query for slow responce
26-Oct-1994 I can not understand the Informix Query Optimizer ! --------------------------------------------------- I have a fine large table and I create a query, where I select all fields from the table. To lookup the records I have an unique index on a field called '…
Re: Query Optimizer
In article <dennisp.762623729@puma>, Dennis Pimple <dennisp@informix.com> wrote: >root@perk.jpr.com (Joseph A. Miele) writes: > > >>The following two queries QUERY 1 and QUERY 2 are the output of SET EXPLAIN >>ON. I do not understand why the query optimizer does a sequential sca…
Re: Query Optimizer
root@perk.jpr.com (Joseph A. Miele) writes: >The following two queries QUERY 1 and QUERY 2 are the output of SET EXPLAIN >ON. I do not understand why the query optimizer does a sequential scan on >root.alujobsh in QUERY 2. The only difference in the two queries are these >lines…
Query Optimizer
The following two queries QUERY 1 and QUERY 2 are the output of SET EXPLAIN ON. I do not understand why the query optimizer does a sequential scan on root.alujobsh in QUERY 2. The only difference in the two queries are these lines: QUERY 1: atkliquh.inv_num = '12316' and QUER…
Re: Optimizing queries info
Greg Sheppard (imop%uspfo.wa-ngnet.army.mil@wa-ngnet.army.mil) wrote: : We've recently written a couple of reports which take FOREVER (hours) : to run...and are getting very interested in streamlineing our queries : for speed and efficiency. Is there a book or useful info on ho…
Re: Optimizing queries info
}From: bt@irl3b2c.att.com }Date: Thu Dec 16 9:15:34 GMT 1993 }Subject: Optimizing queries info }X-Informix-List-Id: <list.3228> } }Greg Shepard wrote } }> We've recently written a couple of reports which take }>FOREVER (hours) to run...and are getting very interested in streamlin…
Re: Optimizing queries info
Greg, The best way to speed up queries is temp tables. If you use set explain on you might find informix is creating its own temp tables but not making good choices. You know you data better that the engine so you should be able to build better (smaller) temp tables. -- Greg …
Query Optimizer or Lack Thereof
Yet another example of a slooooooow query. This does get frustrating because there are too many times that a perfectly good query has to be split into parts (ie. temp tables) in order to get some decent access time. In the query described below, Does anybody have a clue as to …
Re: Optimizing queries info
> > > } > }I suggest that Jonathan Leffler's book - "Using Informix-Sql" [ISBN > }0-201-51240-8] is *required* reading if you want to do anything with isql. > > Thank you very much. > Well deserved I might add (the compliment - not the thanks). j. _____________________________…
Re: Optimizing queries info
}From: bt@irl3b2c.att.com }Date: Thu Dec 16 9:15:34 GMT 1993 }Subject: Optimizing queries info }X-Informix-List-Id: <list.3228> } }Greg Shepard wrote } }> We've recently written a couple of reports which take }>FOREVER (hours) to run...and are getting very interested in streamlin…
Re: Optimizing queries info
Greg Sheppard (imop%uspfo.wa-ngnet.army.mil@wa-ngnet.army.mil) wrote: : We've recently written a couple of reports which take FOREVER (hours) : to run...and are getting very interested in streamlineing our queries : for speed and efficiency. Is there a book or useful info on ho…
Optimizing queries info
Greg Shepard wrote > We've recently written a couple of reports which take >FOREVER (hours) to run...and are getting very interested in streamlineing >our queries for speed and efficiency. Is there a book or useful info on >how best to get the quickest results with queries using…
Optimizing queries info
We've recently written a couple of reports which take FOREVER (hours) to run...and are getting very interested in streamlineing our queries for speed and efficiency. Is there a book or useful info on how best to get the quickest results with queries using iSQL? Or is it just a…
Re: Query Optimiser
John B writes: |Has anyone noticed the 5.X optimizer making bad choices when |choosing a query plan? choosing a query plan? In my case the |optimizer insists in performing a sequential read of a detail table |ignoring the unique index used to join to the master. Performance, …
Query optimizer in 5.01 Informix
Has anyone noticed the 5.X optimizer making bad choices when choosing a query plan? In my case the optimizer insists in performing a sequential read of a detail table ignoring the unique index used to join to the master. Performance, as you can imagine is very, very poor. Infor…
Informix query optimizer info please
I am looking for detailed information on how the Informix query optimizer operates (i.e. makes its decisions, what it looks for, good tips on how to formulate tricky queries, etc.) I have a reasonable amount of experience in the land of Sybase, but I'm new to Informix. After I …
Re: SQL query
Bob Baskett writes: |netters, |can someone explain why the optimizer doesnt short circuit on the |following query: | QUERY: | ------ | select * | from book_bill_back | where 1=2 | Estimated Cost: 370832 | Estimated # of Rows…
False queries and optimizer
Is there any way to slip fake queries past the online5 optimizer? E.g., select * from foo where field1=42 works fine, uses the index on field1, while select * from foo where 1=0 or field1=42 has the optimzer doing a sequential scan on all of foo... (As for "why do I care", I…
Informix Online 5.0 Query Optimizer
We have a problem concerning Informix Online 5.0 query optimization. Informix seems to be choosing extremely inefficient paths for no apparent reason. The part_ref table originally had only one index, a composite of partnumber and option. When a query was performed that joined …
Re: Indexing strategy
1rk2ciINNrhr@emory.mathcs.emory.edu writes: >: Stuff deleted.. >: If you define the unique 3-part index before the >: non-unique 2-part index, the query optimizer may already be using the 3-part >: index (so I have heard), since the optimizer finds the 3-part index first, >: an…
Re: re:choosing idx to use
Ann Barnes@letterkenn-emh1.army.mil writes: |> |> When you create a composite index, the first field is also, effectively an |> index of its own. This was mentioned in the query optimization article here |> yesterday, but perhaps not specifically stated. Actually we have found i…
Re: Query Optimism
%UNIPLEX %TO informix-list@rmy.emory.edu %FROM rridley %SYSTEM DHLNET %SUBJECT Re: Query Optimism %VERIFY y %DATE 29/03/93 16:30 %REFERENCE 17053 Organization: Informix Software, Inc. Re: >In article <billd.733006990@cheetah…
Re: Help: SQL query optimizer
In article <billd.733006990@cheetah>, billd@informix.com (William Daul) writes: |> |> From: Spring 1987 TechNotes |> |> Query Optimization |> ================== |> Uh, Bill? This article is on the Rule-Based optimizer, which we have not used since 1989 (the 4.0 release of p…
Re: Help: SQL query optimizer
Anique Van der Vlugt (anique@sun-4.cs.uct.ac.za) wrote: : : Hi : : I am presently involved in a project for a SQL query optimizer for INFORMIX. : Has anyone done any research in this field or knows of anyone who does? I : am also interested in any articles related to the field o…
Re: Help: SQL query optimizer
In <anique.732967452@sun-4> anique@sun-4.cs.uct.ac.za (Anique Van der Vlugt) writes: >I am presently involved in a project for a SQL query optimizer for INFORMIX. >Has anyone done any research in this field or knows of anyone who does? I >am also interested in any articles rela…
Help: SQL query optimizer
Hi I am presently involved in a project for a SQL query optimizer for INFORMIX. Has anyone done any research in this field or knows of anyone who does? I am also interested in any articles related to the field of query optimization. If you can help me in any way please email m…
Re: Two index query optimization problem
Devin Wala writes: > > >I'm having some problems with Informix over optimizing my query. >I have a table with > 500000 rows and I can't get Informix to >use what I deem to be the "correct" index. > >There are two indexes on the table: > > index1: unique index on A, B; > index…
Re: Two index query optimization problem
> I'm having some problems with Informix over optimizing my query. > I have a table with > 500000 rows and I can't get Informix to > use what I deem to be the "correct" index. > > There are two indexes on the table: > > index1: unique index on A, B; > index2: unique index o…
Two index query optimization problem (fwd)
} I'm having some problems with Informix over optimizing my query. } I have a table with > 500000 rows and I can't get Informix to } use what I deem to be the "correct" index. } } There are two indexes on the table: } } index1: unique index on A, B; } index2: unique index o…
Re: Two index query optimization problem
In article <1992Dec12.000653.7004@anasaz> devin@anasaz (Devin Wala) writes: > > >There are two indexes on the table: > > index1: unique index on A, B; > index2: unique index on C, D, A, B; > >The problem I'm having is that I can't run a query with A and B mentioned >in the WH…
Two index query optimization problem
I'm having some problems with Informix over optimizing my query. I have a table with > 500000 rows and I can't get Informix to use what I deem to be the "correct" index. There are two indexes on the table: index1: unique index on A, B; index2: unique index on C, D, A, B; …
Re: QUERY Optimizer
> Hi netters > > I have observed that the optimizer (SQL 4.0 and an On-Line 4.0 DB) is > very often guessing wrong, even if we run update statistics. > > The estimated number of rows returned does very much depend on the > sequence in which you enter the SELECT statement. In one …
QUERY Optimizer
Christian Hansen write: >I have observed that the optimizer (SQL 4.0 and an On-Line 4.0 DB) is >very often guessing wrong, even if we run update statistics. > >The estimated number of rows returned does very much depend on the >sequence in which you enter the SELECT statement. …
QUERY Optimizer
Hi netters I have observed that the optimizer (SQL 4.0 and an On-Line 4.0 DB) is very often guessing wrong, even if we run update statistics. The estimated number of rows returned does very much depend on the sequence in which you enter the SELECT statement. In one case we had …
query optimization
jmn@pdx.csd.mot.com (Jim Nielsen) write : >Can anyone tell me where I might find some definitive information on >how to optimize wildcard searches. > >I have a table which contains 300,000 records and I need to look up >records based on 6 possible fields. Some of the fields can…
Query Optimizer
What follows are some excerts from my previous posting and an update: > > In running the query described below on my OLD version 2.10.03K performance > was completely acceptable. On version 4.0, ouch!!!! Queries that took seconds > were now taking lots........ of minutes like 15…
Re: Update Statistics
> > Does anyone have a recommendation on how often the update statistics > command should be run? 'update statistics' only updates the system catalogs with the correct number of rows and the 'next-to-highest' and 'next-to-lowest' values so that the optimizer can make an educated…
(no subject)
rhlab!kuhn@uunet.uu.net writes: > In running the query described below on my OLD version performance was > completely acceptable. On version 4.0, ouch!!!! Queries that took seconds > were now taking lots........ of minutes like 15,20,25 minutes. > > After sending tech support a s…