3,875 latch waits over the course of 23 hours? No worries mate. Do you have a
reason to feel that your server is slow, other than the latch waits count?
What do your metrics look like (BR, TR, RAU)?
Recommendations in a vacuum?
You have:
NETTYPE ipcshm,1,250,CPU # Configure poll thread(s) for nettype
But you have 3 CPU VPs. You should have a shared memory listener in every CPU
VP unless those connections are ONLY used for administration.
You have only 8 LRUs configured for your buffer pools, this MAY cause LRU
contention if you have large numbers of users. Check your BR metric.
You only have 256K of DS_TOTAL_MEMORY, this is used when PDQPRIORITY is non-
zero for sorting and grouping and is especially important to index build and
update statistics processing speed. Without PDQ the engine will use 15MB be
default (and up to 50MB) for in-memory sorting. PDQ should have access to
several times that if you have the memory available.
Art S. Kagel
----- Original Message -----
From: Bill Marshall <ids@iiug.org>
At: 7/06 6:56:22
System has been up and stable in OLTP from &AM to 12 Midinght and batch from
midnight till 7 AM. However it seems like the latch waits are high.
Latch waits go as high as 3875
System is stable but I always want more speed. (as long as it does not effect
stability.)
Here is onconfig
I am running IBM Informix Dynamic Server Version 10.00.UC3 Workgroup Server on
a HP dual processor Intel machine 8 Gig of memory
Red Hat Enterprise Linux ES release 3
Kernel 2.4.21-47.ELsmp on an i686
onconfig looks like
#**************************************************************************
#
# Licensed Material - Property Of IBM
#
# "Restricted Materials of IBM"
#
# IBM Informix Dynamic Server
# (c) Copyright IBM Corporation 1996, 2005 All rights reserved.
#
# Title: onconfig.std
# Description: IBM Informix Dynamic Server Configuration Parameters
#
#**************************************************************************
# Root Dbspace Configuration
ROOTNAME rootdbs # Root dbspace name
ROOTPATH /dev/cciss/inforaw1 # Path for device containing root dbspace
ROOTOFFSET 0 # Offset of root dbspace into device (Kbytes)
ROOTSIZE 8000000 # 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 40000 # Physical log file size (Kbytes)
# Logical Log Configuration
LOGFILES 15 # Number of logical log files
LOGSIZE 8000 # Logical log size (Kbytes)
LOG_BACKUP_MODE CONT # Logical log backup mode (MANUAL, CONT)
# Security
# DBCREATE_PERMISSION:
# By default any user can create a database. Uncomment DBCREATE_PERMISSON to
# limit database creation to a specific user. Add a new DBCREATE_PERMISSION
# line for each permitted user.
#DBCREATE_PERMISSION informix
# IFX_EXTEND_ROLE:
# 0 => Disable use of EXTEND role to control who can register
# external routines. This is the default behaviour.
# 1 => Enable use of EXTEND role to control who can register
# external routines.
IFX_EXTEND_ROLE 0 # To control the usage of EXTEND role.
# Tablespace Tablespace Configuration in Root Dbspace
TBLTBLFIRST 0 # First extent size (Kbytes) (0 = default)
TBLTBLNEXT 0 # Next extent size (Kbytes) (0 = default)
# Diagnostics
MSGPATH /informix10.0.uc3/online1204.log # System message log file path
CONSOLE /dev/console # System console message path
# To automatically backup logical logs, edit alarmprogram.sh and set
# BACKUPLOGS=Y
ALARMPROGRAM /informix10.0.uc3/etc/alarmprogram.sh # Alarm program path
ALRM_ALL_EVENTS 0 # Triggers ALARMPROGRAM for any event occur
TBLSPACE_STATS 1 # Maintain tblspace statistics
# System Archive Tape Device
TAPEDEV /dev/st0 # Tape device path
#TAPEDEV /dev/null # Tape device path
TAPEBLK 64 # Tape block size (Kbytes)
TAPESIZE 47201280 # Maximum amount of data to put on tape (Kbytes)
# Log Archive Tape Device
#LTAPEDEV /dev/tapedev # Log tape device path
LTAPEDEV /dev/null # Log tape device path
LTAPEBLK 32 # Log tape block size (Kbytes)
LTAPESIZE 10240 # Max amount of data to put on log tape (Kbytes)
# Optical
STAGEBLOB # Informix Dynamic Server staging area
# System Configuration
SERVERNUM 0 # Unique id corresponding to a OnLine instance
DBSERVERNAME db3v124_shm # Name of default database server
DBSERVERALIASES db3v124fast # List of alternate dbservernames
DBSERVERALIASES db3v124link # List of alternate dbservernames
NETTYPE soctcp,2,100,NET # Configure poll thread(s) for nettype
NETTYPE ipcshm,1,250,CPU # Configure poll thread(s) for nettype
DEADLOCK_TIMEOUT 600 # 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 3 # 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 1 # Affinity start processor
AFF_NPROCS 3 # Affinity number of processors
# Shared Memory Parameters
LOCKS 200000 # Maximum number of locks
NUMAIOVPS 16 # Number of IO vps
PHYSBUFF 128 # Physical log buffer size (Kbytes)
LOGBUFF 64 # Logical log buffer size (Kbytes)
CLEANERS 20 # Number of buffer cleaner processes
SHMBASE 0x44000000L # Shared memory base address
#SHMVIRTSIZE 8192 # initial virtual shared memory segment size
SHMVIRTSIZE 131072 # initial virtual shared memory segment size
SHMADD 32768 # Size of new shared memory segments (Kbytes)
#SHMADD 64000 # Size of new shared memory segments (Kbytes)
SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited
CKPTINTVL 300 # Check point interval (in sec)
TXTIMEOUT 300 # Transaction timeout (in sec)
#TXTIMEOUT 60 # Transaction timeout (in sec)
#STACKSIZE 32 # Stack size (Kbytes)
STACKSIZE 128 # Stack size (Kbytes)
# Dynamic Logging
# DYNAMIC_LOGS:
# 2 : server automatically add a new logical log when necessary. (ON)
# 1 : notify DBA to add new logical logs when necessary. (ON)
# 0 : cannot add logical log on the fly. (OFF)
#
# When dynamic logging is on, we can have higher values for LTXHWM/LTXEHWM,
# because the server can add new logical logs during long transaction
rollback.
# However, to limit the number of new logical logs being added, LTXHWM/LTXEHWM
# can be set to smaller values.
#
# If dynamic logging is off, LTXHWM/LTXEHWM need to be set to smaller values
# to avoid long transaction rollback hanging the server due to lack of logical
# log space, i.e. 50/60 or lower.
#
# In case of system configured with CDR, the difference between LTXHWM and
# LTXEHWM should be atleast 30% so that we could minimize log overrun issue.
DYNAMIC_LOGS 2
LTXHWM 70
LTXEHWM 80
# 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
# 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 /informix10.0.uc3/etc/dr.lostfound # DR lost+found file path
DRIDXAUTO 0 # DR automatic index repair. 0=off, 1=on
# 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_NIFCOMPRESS 0 # Link level compression (-1 never, 0 none, 9 max)
CDR_SERIAL 0 # Serial Column Sequence
CDR_DBSPACE # dbspace for syscdr database
CDR_QHDR_DBSPACE # CDR queue dbspace (default same as catalog)
CDR_QDATA_SBSPACE # List of CDR queue smart blob spaces
# CDR_MAX_DYNAMIC_LOGS
# -1 => unlimited
# 0 => disable dynamic log addition
# >0 => limit the no. of dynamic log additions with the specified value.
# Max dynamic log requests that CDR can make within one server session.
CDR_MAX_DYNAMIC_LOGS 0 # Dynamic log addition disabled by default
# Backup/Restore variables
BAR_ACT_LOG /usr/informix/bar_act.log # ON-Bar Log file - not in /tmp please
BAR_DEBUG_LOG /usr/informix/bar_dbug.log # ON-Bar Debug Log - not in /tmp
please
BAR_MAX_BACKUP 0
BAR_RETRY 1
BAR_NB_XPORT_COUNT 20
BAR_XFER_BUF_SIZE 31
RESTARTABLE_RESTORE ON
BAR_PROGRESS_FREQ 0
# Informix Storage Manager variables
ISM_DATA_POOL ISMData
ISM_LOG_POOL ISMLogs
# Read Ahead Variables
RA_PAGES 64 # Number of pages to attempt to read ahead
RA_THRESHOLD 32 # Number of pages left before next group
# DBSPACETEMP:
# OnLine equivalent of DBTEMP for SE. This is the list of dbspaces
# that the OnLine SQL Engine will use to create temp tables etc.
# If specified it must be a colon separated list of dbspaces that exist
# when the OnLine 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 tmpchunk # 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 OnLine operations.
# For DUMPSHMEM, DUMPGCORE and DUMPCORE 1 means Yes, 0 means No.
DUMPDIR /tmp1204 # 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 OnLine)
DUMPCNT 1 # Number of shared memory or gcore dumps for
# a single user's session
FILLFACTOR 90 # Fill factor for building indexes
# method for OnLine to use when determining current time
USEOSTIME 0 # 0: use internal time(fast), 1: get time from OS(slow)
# Parallel Database Queries (pdq)
MAX_PDQPRIORITY 100 # Maximum allowed pdqpriority
DS_MAX_QUERIES 2 # Maximum number of decision support queries
DS_TOTAL_MEMORY 256 # Decision support memory (Kbytes)
DS_MAX_SCANS 1048576 # Maximum number of decision support scans
DS_NONPDQ_QUERY_MEM 128 # Non PDQ query memory (Kbytes)
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 2 # To hint the optimizer
DIRECTIVES 1 # Optimizer DIRECTIVES ON (1/Default) or OFF (0)
ONDBSPACEDOWN 2 # Dbspace down option: 0 = CONTINUE, 1 = ABORT, 2 = WAIT
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
SBSPACENAME # Default smartblob space name - this is where blobs
# go if no sbspace is specified when the smartblob is
# created. It is also used by some datablades as
# the location to put their smartblobs.
SYSSBSPACENAME # Default smartblob space for use by the Informix
# Server. This is used primarily for Informix Server
# system statistics collection.
BLOCKTIMEOUT 3600 # Default timeout for system block
SYSALARMPROGRAM /informix10.0.uc3/etc/evidence.sh # System Alarm program path
# Optimization goal: -1 = ALL_ROWS(Default), 0 = FIRST_ROWS
OPT_GOAL -1
ALLOW_NEWLINE 0 # embedded newlines(Yes = 1, No = 0 or anything but 1)
#Create Index Online Shared Memory usage limitation
ONLIDX_MAXMEM 5120 # Per pool per index (Kbytes)
#Timeout for client connection request
LISTEN_TIMEOUT 10 # Timeout (in Seconds)
#Following are the deprecated configuration parameters, instead of these
#use BUFFERPOOL configuration parameter
#BUFFERS, LRUS, LRU_MIN_DIRTY, LRU_MAX_DIRTY
#
# The following are default settings for enabling Java in the database.
# Replace all occurrences of /usr/informix with the value of $INFORMIXDIR.
#VPCLASS jvp,num=1 # Number of JVPs to start with
JVPJAVAHOME /informix10.0.uc3/extend/krakatoa/jre # JRE installation root
directory
JVPHOME /informix10.0.uc3/extend/krakatoa # Krakatoa installation directory
JVPPROPFILE /informix10.0.uc3/extend/krakatoa/.jvpprops # JVP property file
JVPLOGFILE /informix10.0.uc3/jvp.log # JVP log file.
JDKVERSION 1.3 # JDK version supported by this server
# The path to the JRE libraries relative to JVPJAVAHOME
JVPJAVALIB /bin
# The JRE libraries to use for the Java VM
JVPJAVAVM jsig:hpi:jvm:java:net:zip:jpeg
# use JVPARGS to change Java VM configuration
#To display jni call
#JVPARGS -verbose:jni
# Classpath to use upon Java VM start-up (use _g version for debugging)
#JVPCLASSPATH
/usr/informix/extend/krakatoa/krakatoa_g.jar:/usr/informix/extend/krakatoa/jdbc_
g.jar
#JVPCLASSPATH
/usr/informix/extend/krakatoa/krakatoa.jar:/usr/informix/extend/krakatoa/jdbc.ja
r
JVPCLASSPATH
/informix10.0.uc3/extend/krakatoa/krakatoa.jar:/informix10.0.uc3/extend/krakatoa
/jdbc.jar
# The following parameters are related to the buffer pool
#BUFFERPOOL
default,buffers=800000,lrus=8,lru_min_dirty=20.000000,lru_max_dirty=25.000000
BUFFERPOOL
default,buffers=800000,lrus=8,lru_min_dirty=0.000010,lru_max_dirty=25.000000
#BUFFERPOOL
size=2K,buffers=800000,lrus=8,lru_min_dirty=20.000000,lru_max_dirty=25.000000
BUFFERPOOL
size=2K,buffers=800000,lrus=8,lru_min_dirty=0.000010,lru_max_dirty=10.000000
thanks for your opinion
*******************************************************************************
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