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