Reducing checkpoints

Hi,i have a database with 80gigabytes of data with 360users and up to 400 when at peak.I use IDS 7.31 running on HP-UX 11.0 and 8 Gig of memory.The checkpoints get to as high as 58sec at peak periods .Users often run out of connections into informix.How can i reduce these checkpoints to acceptable levels like 3seconds.What others measures can help me.Below is the configuration from the onconfig.live in informix ******************************************************************** # # INFORMIX SOFTWARE, INC. # # Title: onconfig.std # Description: Informix Dynamic Server Configuration Parameters # #************************************************************************** # Root Dbspace Configuration ROOTNAME rootdbs # Root dbspace name ROOTPATH /dev/rootdbs # Path for device containing rootdbspace ROOTOFFSET 0 # Offset of root dbspace into device (Kbytes) ROOTSIZE 1000000 # Size of root dbspace (Kbytes) # Disk Mirroring Configuration Parameters MIRROR 0 # Mirroring flag (Yes = 1, No = 0) MIRRORPATH # Path for device containing mirroredroot MIRROROFFSET 0 # Offset into mirrored device (Kbytes) # Physical Log Configuration# Physical Log Configuration PHYSDBS rootdbs # Location (dbspace) of physical log PHYSFILE 250000 # Physical log file size (Kbytes) # Logical Log Configuration LOGFILES 30 # Number of logical log files LOGSIZE 5000 # Logical log size (Kbytes) # Diagnostics MSGPATH /u/informix/online.log # System message log file path CONSOLE /dev/console # System console message path ALARMPROGRAM /u/informix/etc/log_full.sh # Alarm program pathSYSALARMPROGRAM /u/informix/etc/evidence.sh # System Alarm program path TBLSPACE_STATS 0 # System Archive Tape Device TAPEDEV /dev/rmt/c5t3d0BEST # Tape device path TAPEBLK 6144 # Tape block size (Kbytes)TAPEDEV /dev/rmt/c5t3d0BEST # Tape device path TAPEBLK 6144 # Tape block size (Kbytes) TAPESIZE 80000000 # Maximum amount of data to put on tape (Kbytes) # Log Archive Tape Device LTAPEDEV /dev/rmt/c5t4d0BEST dev/rmt/1m # Log tape device pat LTAPEBLK 6144 # Log tape block size (Kbytes) LTAPESIZE 80000000 # Max amount of data to put on log tape (Kbytes) # Optical STAGEBLOB # Informix Dynamic Server/Optical staging area # System Configuration SERVERNUM 2 # Unique id corresponding to a Dynamic Serverinstance DBSERVERNAME ok_srvr # Name of default database server DBSERVERALIASES ok_tcp # List of alternate dbservernames NETTYPE ipcshm,1,800,CPU # Configure poll thread(s) for nettype NETTYPE soctcp,1,100,NET # Configure poll thread(s) fornettype DEADLOCK_TIMEOUT 60 # Max time to wait of lock indistributed env. RESIDENT 0 # Forced residency flag (Yes = 1, No =0)ERVERNUM 2 # Unique id corresponding to a Dynamic Server instance DBSERVERNAME ok_srvr # Name of default database server DBSERVERALIASES ok_tcp # List of alternate dbservernames NETTYPE ipcshm,1,800,CPU # Configure poll thread(s) for nettype NETTYPE soctcp,1,100,NET # Configure poll thread(s) fornettype DEADLOCK_TIMEOUT 60 # Max time to wait of lock indistributed env. RESIDENT 0 # Forced residency flag (Yes = 1, No = 0) MULTIPROCESSOR 1 # 0 for single-processor, 1 formulti-processor NUMCPUVPS 4 # Number of user (cpu) vps SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vpsto one NOAGE 1 # Process aging AFF_SPROC 0 # Affinity start processor AFF_NPROCS 0 # Affinity number of processors # Shared Memory Parameters LOCKS 500000 # Maximum number of locks BUFFERS 200000 # Maximum number of shared buffers NUMAIOVPS 8 # Number of IO vps PHYSBUFF 128 # Physical log buffer size (Kbytes)CKS 500000 # Maximum number of locks BUFFERS 200000 # Maximum number of shared buffers NUMAIOVPS 8 # Number of IO vps PHYSBUFF 128 # Physical log buffer size (Kbytes) LOGBUFF 128 # Logical log buffer size (Kbytes)LOGSMAX 100 # Maximum number of logical log files CLEANERS 127 # Number of buffer cleaner processes SHMBASE 0x0 # Shared memory base address SHMVIRTSIZE 300000 # initial virtual shared memory segmentsize SHMADD 40000 # Size of new shared memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited CKPTINTVL 360 # Check point interval (in sec) LRUS 127 # Number of LRU queues LRU_MAX_DIRTY 1 # LRU percent dirty begin cleaninglimit LRU_MIN_DIRTY 0 # LRU percent dirty end cleaning limit LTXHWM 50 # Long transaction high water markpercentage LTXEHWM 60 # Long transaction high water mark (exclusive) TXTIMEOUT 0x12c # Transaction timeout (in sec) STACKSIZE 64 # Stack size (Kbytes) # System Page Size # BUFFSIZE - Dynamic Server no longer supports this configuration parameter. # To determine the page size used by Dynamic Server on # System Page Size # BUFFSIZE - Dynamic Server no longer supports this configuration parameter. # To determine the page size used by Dynamic Server 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 workerthreads ON_RECVRY_THREADS 1 # 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 /u/informix/etc/dr.lostfound # DR lost+found file pathDRLOSTFOUND /u/informix/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

Post the results of onstat -a onstat -g iov please. -- Neil Truby t:01932 724027 Director m:07798 811708 Ardenta Limited e:neil.truby@ardenta.com "PapaKiKi" <agwanzura@okzim.co.zw> wrote in message news:1150748005.559929.80750@p79g2000cwp.googlegroups.com... > Hi,i have a database with 80gigabytes of data with 360users and up to > 400 when at peak.I use IDS 7.31 running on HP-UX 11.0 and 8 Gig of > memory.The checkpoints get to as high as 58sec at peak periods .Users > often run out of connections into informix.How can i reduce these > checkpoints to acceptable levels like 3seconds.What others measures can > help me.Below is the configuration from the onconfig.live in informix > ******************************************************************** > # > # INFORMIX SOFTWARE, INC. > # > # Title: onconfig.std > # Description: Informix Dynamic Server Configuration Parameters > # > #************************************************************************** > > # Root Dbspace Configuration > > ROOTNAME rootdbs # Root dbspace name > ROOTPATH /dev/rootdbs # Path for device containing root> dbspace > ROOTOFFSET 0 # Offset of root dbspace into device > (Kbytes) > ROOTSIZE 1000000 # 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# Physical Log Configuration > > PHYSDBS rootdbs # Location (dbspace) of physical log > PHYSFILE 250000 # Physical log file size (Kbytes)> > # Logical Log Configuration > > LOGFILES 30 # Number of logical log files > LOGSIZE 5000 # Logical log size (Kbytes)> > # Diagnostics > > MSGPATH /u/informix/online.log # System message log file path > CONSOLE /dev/console # System console message path > ALARMPROGRAM /u/informix/etc/log_full.sh # Alarm program path> SYSALARMPROGRAM /u/informix/etc/evidence.sh # System Alarm program path > TBLSPACE_STATS 0> > # System Archive Tape Device > > TAPEDEV /dev/rmt/c5t3d0BEST # Tape device path > TAPEBLK 6144 # Tape block size (Kbytes)TAPEDEV > /dev/rmt/c5t3d0BEST # Tape device path > TAPEBLK 6144 # Tape block size (Kbytes) > TAPESIZE 80000000 # Maximum amount of data to put on tape > (Kbytes)> > # Log Archive Tape Device > > LTAPEDEV /dev/rmt/c5t4d0BEST dev/rmt/1m # Log tape device > pat > LTAPEBLK 6144 # Log tape block size (Kbytes) > LTAPESIZE 80000000 # Max amount of data to put on log tape > (Kbytes)> > # Optical > > STAGEBLOB # Informix Dynamic Server/Optical > staging area > > # System Configuration > > SERVERNUM 2 # Unique id corresponding to a Dynamic Server> instance > DBSERVERNAME ok_srvr # Name of default database server > DBSERVERALIASES ok_tcp # List of alternate dbservernames > NETTYPE ipcshm,1,800,CPU # Configure poll thread(s) for nettype > NETTYPE soctcp,1,100,NET # Configure poll thread(s) for> nettype > DEADLOCK_TIMEOUT 60 # Max time to wait of lock in> distributed env. > RESIDENT 0 # Forced residency flag (Yes = 1, No => 0)ERVERNUM 2 # Unique id corresponding to a Dynamic Server > instance > DBSERVERNAME ok_srvr # Name of default database server > DBSERVERALIASES ok_tcp # List of alternate dbservernames > NETTYPE ipcshm,1,800,CPU # Configure poll thread(s) for nettype > NETTYPE soctcp,1,100,NET # Configure poll thread(s) for> nettype > 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 4 # Number of user (cpu) vps > SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps> to one > > NOAGE 1 # Process aging > AFF_SPROC 0 # Affinity start processor > AFF_NPROCS 0 # Affinity number of processors> > # Shared Memory Parameters > > LOCKS 500000 # Maximum number of locks > BUFFERS 200000 # Maximum number of shared buffers > NUMAIOVPS 8 # Number of IO vps > PHYSBUFF 128 # Physical log buffer size (Kbytes)CKS > 500000 # Maximum number of locks > BUFFERS 200000 # Maximum number of shared buffers > NUMAIOVPS 8 # Number of IO vps > PHYSBUFF 128 # Physical log buffer size (Kbytes) > LOGBUFF 128 # Logical log buffer size (Kbytes)> LOGSMAX 100 # Maximum number of logical log files > CLEANERS 127 # Number of buffer cleaner processes > SHMBASE 0x0 # Shared memory base address > SHMVIRTSIZE 300000 # initial virtual shared memory segment> size > SHMADD 40000 # Size of new shared memory segments > (Kbytes) > SHMTOTAL 0 # Total shared memory (Kbytes). > 0=>unlimited > CKPTINTVL 360 # Check point interval (in sec) > LRUS 127 # Number of LRU queues > LRU_MAX_DIRTY 1 # LRU percent dirty begin cleaning> limit > LRU_MIN_DIRTY 0 # LRU percent dirty end cleaning limit > LTXHWM 50 # Long transaction high water mark> percentage > LTXEHWM 60 # Long transaction high water mark > (exclusive) > TXTIMEOUT 0x12c # Transaction timeout (in sec) > STACKSIZE 64 # Stack size (Kbytes)> > # System Page Size > # BUFFSIZE - Dynamic Server no longer supports this configuration > parameter. > # To determine the page size used by Dynamic Server on > # System Page Size > # BUFFSIZE - Dynamic Server no longer supports this configuration > parameter. > # To determine the page size used by Dynamic Server 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 > # DRAU