RE: Performance Issues
The checkpoint intervals are 15 minutes. I don't think that is the reason
for the extent of performance degradation being experienced.
Am currently looking at the status of by buffers to see whether there is a
need to increase them.
thanks again
regards
roger
-----Original Message-----
From: Juan Manuel de Villeros [mailto:jmdevil@gmail.com]
Sent: Tuesday, 07 December 2004 11:12 AM
To: Roger Cariah; informix-list@iiug.org
Subject: Re: Performance Issues
I think you could benefit from lowering your checkpoint interval, but
to be sure, how long do they take right now? During the checkpoint all
transaction processing is suspended, maybe that is what your users
perceive as low performance?
-- Juan de Villeros
On Tue, 7 Dec 2004 09:50:26 -0400, Roger Cariah <rogerc@ppsl.co.tt> wrote:
>
> Thanks for your prompt response
>
> Regards
> roger
>
> My checkpoints intervals are more or less 15 minutes.
>
> CONFIGURATION FILE:
>
>
#**************************************************************************
> #
> # INFORMIX SOFTWARE, INC.
> #
> # Title: onconfig.std
> # Description: INFORMIX-OnLine Configuration Parameters
> #
>
#**************************************************************************
>
> # Root Dbspace Configuration
>
> ROOTNAME rootdbs # Root dbspace name> ROOTPATH /informix/rt/chunks/rchka
> # Path for device containing root dbspace
> ROOTOFFSET 256 # Offset of root dbspace into device
> (Kbytes)
> ROOTSIZE 495722 # Size of root dbspace (Kbytes)>
> # Disk Mirroring Configuration Parameters
>
> MIRROR 1 # Mirroring flag (Yes = 1, No = 0)
> MIRRORPATH /informix/rt/chunks/mrchka
> # Path for device containing mirrored root
> MIRROROFFSET 256 # Offset into mirrored device (Kbytes)>
> # Physical Log Configuration
>
> PHYSDBS physdbs # Location (dbspace) of physical log
> PHYSFILE 64000 # Physical log file size (Kbytes)>
> # Logical Log Configuration
>
> LOGFILES 1500 # Number of logical log files
> LOGSIZE 500 # Logical log size (Kbytes)>
> # Diagnostics
>
> MSGPATH /informix/rt/exe/onl_rt.log # System message log file path
> CONSOLE /dev/console # System console message path
> ALARMPROGRAM /informix/rt/exe/etc/log_full.sh # Alarm program path
> TBLSPACE_STATS 1>
> # System Archive Tape Device
>
> TAPEDEV /dev/rmt0h # Tape device path
> TAPEBLK 512 # Tape block size (Kbytes)
> TAPESIZE 4000000 # Maximum amount of data to put on tape
> (Kbytes)>
> # Log Archive Tape Device
>
> LTAPEDEV /dev/rmt1h # Log tape device path
> LTAPEBLK 512 # Log tape block size (Kbytes)
> LTAPESIZE 4000000 # Max amount of data to put on log tape
> (Kbytes)>
> # Optical
>
> STAGEBLOB # INFORMIX-OnLine/Optical staging area
>
> # System Configuration
>
> SERVERNUM 1 # Unique id corresponding to a OnLine> instance
> DBSERVERNAME rt_soc # Name of default database server
> DBSERVERALIASES rt_shm # List of alternate dbservernames> # The following NETTYPE seems to be causing problems with 6.05 Tools.
> NETTYPE ipcshm,1,30,CPU # Configure poll thread(s) for nettype
> NETTYPE soctcp,5,25,CPU # Configure poll thread(s) for nettype
> DEADLOCK_TIMEOUT 60 # Max time to wait of lock in distributed
> env.
> RESIDENT 2 # Forced residency flag (Yes = 1, No = 0)
>
> MULTIPROCESSOR 1 # 0 for single-processor, 1 for> multi-processor
> NUMCPUVPS 6 # 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 64000 # Maximum number of shared buffers
> NUMAIOVPS 2 # Number of IO vps
> PHYSBUFF 32 # Physical log buffer size (Kbytes)
> LOGBUFF 32 # Logical log buffer size (Kbytes)> LOGSMAX 2000 # Maximum number of logical log files
> CLEANERS 10 # Number of buffer cleaner processes
> SHMBASE 0x200000000 # Shared memory base address> #SHMVIRTSIZE 186432 # initial virtual shared memory segment
> size
> SHMVIRTSIZE 186432 # initial virtual shared memory segmentsize
> SHMADD 16384 # Size of new shared memory segments
> (Kbytes)
> SHMTOTAL 0 # Total shared memory (Kbytes).
0=>unlimited
> CKPTINTVL 900 # Check point interval (in sec)
> LRUS 10 # Number of LRU queues
> LRU_MAX_DIRTY 10 # LRU percent dirty begin cleaning limit
> LRU_MIN_DIRTY 5 # LRU percent dirty end cleaning limit
> LTXHWM 45 # Long transaction high water mark> percentage
> LTXEHWM 50 # Long transaction high water mark
> (exclusive)
> TXTIMEOUT 0x12c # Transaction timeout (in sec)
> STACKSIZE 64 # 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 10 # Default number of online workerthreads
>
> # Data Replication Variables
> # DRAUTO: 0 manual, 1 retain type, 2 reverse type
> DRAUTO 0 # DR automatic switchover
> DRINTERVAL 30 # DR max time between DR buffer flushes
(in
> sec)
> DRTIMEOUT 30 # DR network timeout (in sec)
> DRLOSTFOUND /informix/rt/exe/etc/dr.lostfound # DR lost+found filepath
>
> # CDR Variables
> CDR_LOGBUFFERS 2048 # size of log reading buffer pool (Kbytes)
> 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 CDRqueue
> (Kbytes)
> CDR_LOGDELTA 30 # % of log space allowed in queue memory
> CDR_NUMCONNECT 16