inofrmix 10.0 checkpoint duration时间过长问题
请教高手：我的informix 10.0 经常出现checkpoint duration 时间过长问题。不知道什么问题，希望高手能指点一下。主机为P570，P6 4.4Ghz。 8CPU 32G MEM。
onconfig文件如下：
#**************************************************************************
#
#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 /usr/informix/data/rootdbs
# Path for device containing root dbspace
ROOTOFFSET 1000 # Offset of root dbspace into device (Kbytes)
ROOTSIZE 2000000 # 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 phydbs # Location (dbspace) of physical log
PHYSFILE 200000 # Physical log file size (Kbytes)
# Logical Log Configuration
LOGFILES 60 # Number of logical log files
LOGSIZE 20000 # Logical log size (Kbytes)
LOG_BACKUP_MODE CONT # Logical log backup mode (MANUAL, CONT)
#LOG_BACKUP_MODE MANUAL # Logical log backup mode (MANUAL, CONT)
# Tablespace Tablespace Configuration in Root Dbspace
TBLTBLFIRST 0 # First extent size (Kbytes) (0 = default)
TBLTBLNEXT 0 # Next extent size (Kbytes) (0 = default)
# 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
# DB_LIBRARY_PATH:
# When loading a (C or C++) shared object (for a UDR or UDT), IDS checks that
# the user-specified path starts with one of the directory prefixes listed in
# the comma-separated list of prefixes in DB_LIBRARY_PATH. The string
# "$INFORMIXDIR/extend" must be included in DB_LIBRARY_PATH in order for
# extensibility and IBM supplied blades to work correctly.
# DB_LIBRARY_PATH $INFORMIXDIR/extend
# IFX_EXTEND_ROLE:
# 0 (or off) => Disable use of EXTEND role to control who can register
# external routines.
# 1 (or on)=> Enable use of EXTEND role to control who can register
# external routines. This is the default behaviour.
#
IFX_EXTEND_ROLE 1 # To control the usage of EXTEND role.
# Diagnostics
MSGPATH /usr/informix/online.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 /usr/informix/etc/alarmprogram.sh # Alarm program path
ALRM_ALL_EVENTS 0 # Triggers ALARMPROGRAM for any event occur
TBLSPACE_STATS1 # Maintain tblspace statistics
# System Archive Tape Device
TAPEDEV /dev/null # Tape device path
TAPEBLK 32 # Tape block size (Kbytes)
TAPESIZE 10240 # Maximum amount of data to put on tape (Kbytes)
# Log Archive Tape Device
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 online # Name of default database server
DBSERVERALIASES oncli # List of alternate dbservernames
NETTYPE ipcshm,2,200,CPU # Configure poll thread(s) for nettype
NETTYPE soctcp,4,200,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)
MULTIPROCESSOR1 # 0 for single-processor, 1 for multi-processor
#NUMCPUVPS 1 # 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 1500000 # Maximum number of locks
#NUMAIOVPS 8 # Number of IO vps
PHYSBUFF 32 # Physical log buffer size (Kbytes)
LOGBUFF 32 # Logical log buffer size (Kbytes)
CLEANERS 1 # Number of buffer cleaner processes
SHMBASE 0x700000010000000 # Shared memory base address
SHMVIRTSIZE 8192 # initial virtual shared memory segment size
SHMADD 32768 # Size of new shared memory segments (Kbytes)
EXTSHMADD 8192 # Size of new extension shared memory segments (Kbytes)
SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited
CKPTINTVL 300 # Check point interval (in sec)
TXTIMEOUT 0x12c # Transaction timeout (in sec)
STACKSIZE 64
# 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 /usr/informix/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_DSLOCKWAIT5 # 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 0,0 # 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_BACKUP0
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 # Number of pages to attempt to read ahead
RA_THRESHOLD # 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 tmpdbs # 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 /usr/informix/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 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 50 # Maximum allowed pdqpriority
DS_MAX_QUERIES2 # Maximum number of decision support queries
DS_TOTAL_MEMORY # Decision support memory (Kbytes)
DS_MAX_SCANS 1048576 # Maximum number of decision support scans
DS_NONPDQ_QUERY_MEM -1 # 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 /usr/informix/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_TIMEOUT10 # Timeout (in Seconds)
#Following are the deprecated configuration parameters, instead of these
#use BUFFERPOOL configuration parameter
#BUFFERS, LRUS, LRU_MIN_DIRTY, LRU_MAX_DIRTY
IFX_FOLDVIEW 0 # fold multiple tables or union all view with ansi joins
#
# The following are default settings for enabling Java in the database.
# Replace all occurrences of /usr/informix with the value of $INFORMIXDIR.
VPCLASS cpu,num=7
VPCLASS aio,num=8
JVPJAVAHOME /usr/informix/extend/krakatoa/jre
# JRE installation root directory
JVPHOME /usr/informix/extend/krakatoa # Krakatoa installation directory
JVPPROPFILE /usr/informix/extend/krakatoa/.jvpprops # JVP property file
JVPLOGFILE /usr/informix/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 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.jar
# The following parameters are related to the buffer pool
BUFFERPOOL size=4K,buffers=1000000,lrus=16,lru_min_dirty=50.000000,lru_max_dirty=60.000000 多长是长？
在检查点的时候输出onstat -a
onstat -g all 有时候的checkpoint 时间都达到了300多秒。严重影响了业务。
onstat -a 和onstat -g all 输出太大，用附件。麻烦了。 。。你这onstat的输出。。。。哎。。
你这个是在正常情况下的onstat输出（输出的结果并不是onstat -a /-g all呀）。
从当前的信息上看，在正常情况下，所有的写都集中在检查点写，在检查点写的信息也不多。。以当前的CHUNK的IO水平是完全可以承受的。。希望输出的onstat 信息是在长检查点时候的信息。。 首先多谢liaosnet的回复，长检查点的出现不定时。如果出现的话，我们的应用系统将会严重影响。所以很难输出onstat在长检查点的信息。
就上面的信息，我们在数据库的配置上面还应该做什么优化？望指教。 首先多谢liaosnet的回复，长检查点的出现不定时。如果出现的话，我们的应用系统将会严重影响。所以很难输出 ...
liqxy 发表于 2010-08-02 10:13 http://bbs3.chinaunix.net/images/common/back.gif
从上面的信息上看，当然配置足够正常使用。。
如果你的数据库可以重启的话，重启里加入环境TRACECKPT=1 并使用之生效，再启动数据库。这样的话，数据库在检查点的时候将会有跟踪信息写到online.log，起码可以确定是在做什么操作的时候慢。。 附件下载失败……
估计 只启动了1个CPUVP 可以用onstat -g glo统计下
只有一个的话 可以取消配置文件中对NUMCPUVPS参数的注释
系统允许的话修改为：NUMCPUVPS 4
lru_min_dirty=50.000000,lru_max_dirty=60.000000也可以改小点
比较极端的是lru_min_dirty=0,lru_max_dirty=1 附件下载失败……
估计 只启动了1个CPUVP 可以用onstat -g glo统计下
只有一个的话 可以取消配置文件中对 ...
zpc_silenthill 发表于 2010-08-02 13:37 http://bbs3.chinaunix.net/images/common/back.gif
从他提供的信息上看，就只有CHUNK写，也就是只有检查点的时候才写。。已经不存在改不改LRU的问题，因为LRU写为0 :em28: TRACECKPT=1 加在onconfig文件中吗？ 调整LRU个数=* NUMofVP
降低Lru_min_dirty=5%，lru_max_dirty=10%，如果还出现那种现象可以再次降低为Lru_min_dirty=1%，lru_max_dirty=5%
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