Guys thanks for your contributions.
there are some points that have helped me like, A checkpoint cannot
proceed while a user is in a critical session.Have been actin on this.

Thanks guys.
"Dirk Moolman" <DirkM@mxgroup.co.za> wrote in message news:<br7lpe$sc7$1@terabinaries.xmission.com>...
> You say showing signs of slowing down. You need to know what those
> plus minus 300 users are running on your server. One thing to
> investigate - are they running any / more reports than they normally do
> ? Any new batch processes ?
> These things can have a big impact on system performance.
>
>
> -----Original Message-----
> From: owner-informix-list@iiug.org [mailtowner-informix-list@iiug.org]
> On Behalf Of Bonny
> Sent: Wednesday, December 10, 2003 12:47 PM
> To: informix-list@iiug.org
> Subject: Perfomance Tuning
>
> I have IDS 7.31 running on HP-UX 11.0 and 4 Gig of memory.
>
> I have a 40 Gig database with on average 260 users and at peak about
> 315 users.
> I want to tune my database , as it has shown signs of slowing down
> recently.
> Checkpoints are taking on average 10 seconds,under normal processing
> there should be 6 seconds.
> I have posted my onconfig file,onstat -p .What parameters should i
> consider for tuning both from the Informix side and Unix side.
>
> Onconfig
>
> #************************************************* **********************
> ***
> #
> # 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
>
> 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/c8t3d0BEST # 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/1m # Log tape device pat
> LTAPEBLK 1024 # Log tape block size (Kbytes)
> LTAPESIZE 4000000 # Max amount of data to put on log
> tape (Kbytes)
>
> # Optical
>
> STAGEBLOB # Informix Dynamic Server/Optical
> staging area
>
> # System Configuration
>
> SERVERNUM 1 # 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,1,500,CPU # Configure poll thread(s) for
> nettype
> NETTYPE soctcp,1,5,NET # Configure poll thread(s) for nettype
> DEADLOCK_TIMEOUT 60 # Max time to wait of lock in
> distributed env.
> RESIDENT -1 # Forced residency flag (Yes = 1, No =
> 0)
>
> MULTIPROCESSOR 1 # 0 for single-processor, 1 for
> multi-processor
> NUMCPUVPS 2 # 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 400000 # 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 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
> # 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 path
>
> # 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 CDR
> queue (Kbytes)
> CDR_LOGDELTA 30 # % of log space allowed in queue
> memory
> CDR_NUMCONNECT 400 # Expected connections per server
> CDR_NIFRETRY 300 # Connection retry (seconds)
> CDR_NIFCOMPRESS 0 # Link level compression (-1 never, 0
> none, 9 max)
>
> # Backup/Restore variables
> BAR_ACT_LOG /tmp/bar_act.log
> BAR_MAX_BACKUP 0
> BAR_RETRY 1
> BAR_NB_XPORT_COUNT 10
> BAR_XFER_BUF_SIZE 31
>
> # Informix Storage Manager variables
> ISM_DATA_POOL ISMData # If the data pool name is changed, be
> sure to
> # update $INFORMIXDIR/bin/onbar. Change
> to
> # ism_catalog -create_bootstrap -pool
> <new name>
> ISM_LOG_POOL ISMLogs
>
> # Read Ahead Variables
> RA_PAGES # Number of pages to attempt to read
> ahead
> RA_THRESHOLD # Number of pages left before next
> group
>
> # DBSPACETEMP:
> # Dynamic Server equivalent of DBTEMP for SE. This is the list of
> dbspaces
> # that the Dynamic Server SQL Engine will use to create temp tables
> etc.
> # If specified it must be a colon separated list of dbspaces that
> exist
> # when the Dynamic Server system is brought online. If not specified,
> or if
> # all dbspaces specified are invalid, various ad hoc queries will
> create
> # temporary files in /tmp instead.
>
> DBSPACETEMP tempdbs # Default temp dbspaces
>
> # DUMP*:
> # The following parameters control the type of diagnostics information
> which
> # is preserved when an unanticipated error condition (assertion
> failure) occurs
> # during Dynamic Server operations.
> # For DUMPSHMEM, DUMPGCORE and DUMPCORE 1 means Yes, 0 means No.
>
> DUMPDIR /tmp # Preserve diagnostics in this
> directory
> DUMPSHMEM 1 # Dump a copy of shared memory
> DUMPGCORE 0 # Dump a core image using 'gcore'
> DUMPCORE 0 # Dump a core image (Warning:this
> aborts Dynamic Server)
> DUMPCNT 1 # Number of shared memory or gcore
> dumps for
> # a single user's session
>
> FILLFACTOR 90 # Fill factor for building indexes
>
> # method for Dynamic Server to use when determining current time
> USEOSTIME 0 # 0: use internal time(fast), 1: get
> time from OS(slow)
>
> MAX_PDQPRIORITY 100 # Maximum allowed pdqpriority
> DS_MAX_QUERIES 4 # Maximum number of decision support
> queries
> DS_TOTAL_MEMORY 512 # Decision support memory (Kbytes)
> DS_MAX_SCANS 1048576 # Maximum number of decision support
> scans
> DATASKIP off # List of dbspaces to skip
>
> # OPTCOMPIND
> # 0 => Nested loop joins will be preferred (where
> # possible) over sortmerge joins and hash joins.
> # 1 => If the transaction isolation mode is not
> # "repeatable read", optimizer behaves as in (2)
> # below. Otherwise it behaves as in (0) above.
> # 2 => Use costs regardless of the transaction isolation
> # mode. Nested loop joins are not necessarily
> # preferred. Optimizer bases its decision purely
> # on costs.
> OPTCOMPIND 0 # To hint the optimizer
>
> ONDBSPACEDOWN 2 # Dbspace down option: 0 = CONTINUE, 1
> = ABORT, 2 = WAIT
> LBU_PRESERVE 0 # Preserve last log for log backup
> OPCACHEMAX 0 # Maximum optical cache size (Kbytes)
>
> # HETERO_COMMIT (Gateway participation in distributed transactions)
> # 1 => Heterogeneous Commit is enabled
> # 0 (or any other value) => Heterogeneous Commit is disabled
> HETERO_COMMIT 0
>
> # Optimization goal: -1 = ALL_ROWS(Default), 0 = FIRST_ROWS
> OPT_GOAL -1
>
> # Optimizer DIRECTIVES ON (1/Default) or OFF (0)
> DIRECTIVES 1
>
> # Status of restartable restore
> RESTARTABLE_RESTORE off
>
> onstat -p
>
> Profile
>
> dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
> 43516129 30668426 1667352873 97.39 2423970 3864252 13071436 81.46
>
> isamtot open start read write rewrite delete commit
> rollbk
> 2925597306 23707928 806452050 695971992 1808636 1005737 367626
> 662257 64
>
> 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
> 0 0 0 82474.80 3116.64 221 442
>
> bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress
> seqscans
> 13577857 470 1390483266 4 0 1583 98573
> 2061845
>
> ixda-RA idx-RA da-RA RA-pgsused lchwaits
> 17761876 257123 8912823 26921277 873324
>
> sending to informix-list