RE: Informix Performance
What is your OS? Are you also using cooked chunks?
What does top (or equivalent) show on your server during the slow times?
First look in Unix to see what the limit is, if any.
Then look in Informix to determine any resource contention...
onstat -u Anything obvious for users
onstat -g rea Ready queue
onstat -g seg How many segments
Does the application reside on the database server? If not, then is it the application server or network?
MW
> -----Original Message-----
> From: owner-informix-list@iiug.org
> [mailto:owner-informix-list@iiug.org]On Behalf Of Daniel Castro
> Sent: Friday, 27 February 2004 7:55 a.m.
> To: informix-list@iiug.org
> Subject: Informix Performance
>
>
> Hi,
>
> I am having informix performance problems. I don't know where to
> start.
> Sometimes the database hangs, always from 00:00am to 5:00 am, but it
> gives no error in the log file. Can you help me?
> Sometimes the users says that the system is slow, but I can't identify
> why.
> First, the result of onstat -p:
>
> Informix Dynamic Server Version 9.30.UC1 -- On-Line -- Up 9 days
> 21:06:09 -- 1582656 Kbytes
>
> Profile
> dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
> 67223627 173897813 2077681908 96.76 12042759 61104633 222993237
> 94.60
>
> isamtot open start read write rewrite delete commit
> rollbk
> 2790216351 184683421 616967012 4148277112 65017319 12219659 28562330
> 8807460 884
>
> gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
> 0 0 0 0 0 0 0
>
> ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
> 7 0 0 336038.88 116702.45 1385 4099
>
> bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress
> seqscans
> 7192942 14028 903998567 4 0 6224 6824574
> 39496093
>
> ixda-RA idx-RA da-RA RA-pgsused lchwaits
> 12311760 5075181 15389056 32074507 56519934
>
> Second my onconfig file:
>
> #*****************************************************************
> *********
> #
> # INFORMIX SOFTWARE, INC.
> #
> # Title: onconfig.producao
> # Description: Informix Dynamic Server Configuration Parameters
> #
> #*****************************************************************
> *********
> # Root Dbspace Configuration
> ROOTNAME rootdbs # Root dbspace name> ROOTPATH /cooked_file/dbs_rootP # Path for device containing
> root dbspace
> ROOTOFFSET 0 # Offset of root dbspace into device
> (Kbytes)
> ROOTSIZE 471039 # Size of root dbspace (Kbytes)> # Disk Mirroring Configuration Parameters
> MIRROR 0 # Mirroring flag (Yes = 1, No = 0)
> MIRRORPATH # Path for device containing mirrored> root
> MIRROROFFSET 0 # Offset into mirrored device (Kbytes)> # Physical Log Configuration
> PHYSDBS wpdphlog # Location (dbspace) of physical log
> PHYSFILE 60000 # Physical log file size (Kbytes)> # Logical Log Configuration
> LOGFILES 40 # Number of logical log files
> LOGSIZE 10000 # Logical log size (Kbytes)> # Diagnostics
> MSGPATH /opt/informix/producao.log # System message log file
> path
> CONSOLE /dev/console # System console message path
> ALARMPROGRAM /opt/informix/etc/log_full.sh # Alarm program path
> TBLSPACE_STATS 1 # Maintain tblspace statistics> # System Archive Tape Device
> TAPEDEV /dev/st0 # Tape device path
> TAPEBLK 16 # Tape block size (Kbytes)
> TAPESIZE 100000000 # Maximum amount of data to put on
> tape (Kbytes)> # Log Archive Tape Device
> LTAPEDEV /dev/st0 # Log tape device path
> LTAPEBLK 16 # Log tape block size (Kbytes)
> LTAPESIZE 100000000 # Max amount of data to put on log
> tape (Kbytes)
> # Optical> STAGEBLOB # Informix Dynamic Server staging area
> # System Configuration
> SERVERNUM 1 # Unique id corresponding to a OnLine> instance
> DBSERVERNAME producao # Name of default database server
> DBSERVERALIASES # List of alternate dbservernames
> DEADLOCK_TIMEOUT 60 # Max time to wait of lock in> distributed env.
> RESIDENT 0 # Forced residency flag (Yes = 1, No =
> 0)
> MULTIPROCESSOR 1 # 0 for single-processor, 1 for> multi-processor
> # NUMCPUVPS 1 # Number of user (cpu) vps
> SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps> to one
> # NOAGE 0 # Process aging
> # AFF_SPROC 0 # Affinity start processor
> # AFF_NPROCS 0 # Affinity number of processors
> # Shared Memory Parameters
> LOCKS 200000 # Maximum number of locks
> BUFFERS 600000 # Maximum number of shared buffers> # NUMAIOVPS # Number of IO vps
> PHYSBUFF 128 # Physical log buffer size (Kbytes)
> LOGBUFF 128 # Logical log buffer size (Kbytes)
> CLEANERS 4 # Number of buffer cleaner processes
> SHMBASE 0x50000000 # Shared memory base address
> SHMVIRTSIZE 154000 # initial virtual shared memory> segment size
> SHMADD 32768 # Size of new shared memory segments
> (Kbytes)
> SHMTOTAL 0 # Total shared memory (Kbytes).
> 0=>unlimited
> CKPTINTVL 600 # Check point interval (in sec)
> LRUS 64 # Number of LRU queues
> LRU_MAX_DIRTY 3 # LRU percent dirty begin cleaning> limit
> LRU_MIN_DIRTY 1 # LRU percent dirty end cleaning limit
> TXTIMEOUT 0x12c # Transaction timeout (in sec)
> STACKSIZE 32 # Stack size (Kbytes)> # System Page Size
> # BUFFSIZE - OnLine no longer supports this configuration parameter.
> # To determine the page size used by OnLine on your
> platform
> # see the last line of output from the command, 'onstat
> -b'.
> # Recovery Variables
> # OFF_RECVRY_THREADS:
> # Number of parallel worker threads during fast recovery or an offline
> restore.
> # ON_RECVRY_THREADS:
> # Number of parallel worker threads during an online restore.
> OFF_RECVRY_THREADS 10 # Default number of offline worker> threads
> ON_RECVRY_THREADS 1 # Default number of online worker> threads
> # Data Replication Variables
> DRINTERVAL 30 # DR max time between DR buffer
> flushes (in sec)
> DRTIMEOUT 30 # DR network timeout (in sec)
> DRLOSTFOUND /usr/informix/etc/dr.lostfound # DR lost+found file> path
> # CDR Variables
> CDR_EVALTHREADS 1,2 # evaluator threads
> (per-cpu-vp,additional)
> CDR_DSLOCKWAIT 5 # DS lockwait timeout (seconds)
> CDR_QUEUEMEM 4096 # Maximum amount of memory for any CDR
> queue (Kbytes)
> CDR_NIFCO