IDS Forum

Buffer Turnover Rate question

Posted By: BRIAN AMSTUTZ
Date: Wednesday, 15 July 2009, at 2:15 p.m.

HPUX 11vi2, 4x440MHz cpu, 8GB RAM, Informix 10.00.HC5

I just recently downloaded the ratios.ksh script and started running it. I'm not noticing any performance problems as such but it seems like the BTR is quite high. onstat -c and onstat -p output is included below. Anything to worry about? Thanks! -bla

ReadAhead Utilization (UR): 99.6735 %
Bufwaits Ratio(BR): 1.13657 %
Average Buffer Turnover Rate (BTR): 36.9059/HR
Stats reset 71:40:00 ago.

IBM Informix Dynamic Server Version 10.00.HC5 -- On-Line -- Up 2 days 23:47:25 -- 591028 Kbytes

Configuration File: /opt/informix/etc/onconf.cars
# Root Dbspace Configuration

ROOTNAME root # Root dbspace name
ROOTPATH /opt/informix/dev/root.1

# Path for device containing root dbspace
ROOTOFFSET 0 # Offset of root dbspace into device (Kbytes)
ROOTSIZE 1024000 # 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 root # Location (dbspace) of physical log
PHYSFILE 40960 # Physical log file size (Kbytes)

# Logical Log Configuration

LOGFILES 60 # Number of logical log files
LOGSIZE 14336 # Logical log size (Kbytes)
LOG_BACKUP_MODE MANUAL # 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
DBCREATE_PERMISSION root

# 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 1 # 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 /opt/informix/Logs/cars.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 /opt/informix/etc/no_log.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/rmt/1m # Tape device path
TAPEBLK 256 # Tape block size (Kbytes)
TAPESIZE 0 # Maximum amount of data to put on tape (Kbytes)

# Log Archive Tape Device

LTAPEDEV /dev/rmt/2m # Log tape device path
LTAPEBLK 32 # Log tape block size (Kbytes)
LTAPESIZE 0 # Max amount of data to put on log tape (Kbytes)

# Optical

STAGEBLOB # Informix Dynamic Server staging area

# System Configuration

SERVERNUM 1 # Unique id corresponding to a OnLine instance
DBSERVERNAME daniel3 # Name of default database server
DBSERVERALIASES daniel3tcp,carsmain_tcp # List of alternate dbservernames
NETTYPE ipcshm,3,250,CPU # Configure poll thread(s) for nettype
NETTYPE soctcp,3,,NET # Configure poll thread(s) for nettype
DEADLOCK_TIMEOUT 60 # Max time to wait of lock in distributed env.

MULTIPROCESSOR 1 # 0 for single-processor, 1 for multi-processor
SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps to one

# Shared Memory Parameters
BUFFERPOOL size=2K,buffers=100000,lrus=29,lru_min_dirty=2.000000,lru_max_dirty=4.000000
LOCKS 512000 # Maximum number of locks
PHYSBUFF 64 # Physical log buffer size (Kbytes)
LOGBUFF 32 # Logical log buffer size (Kbytes)
CLEANERS 29 # Number of buffer cleaner processes
SHMBASE 0x0 # Shared memory base address
SHMVIRTSIZE 321536 # initial virtual shared memory segment size
SHMADD 32768 # Size of new shared memory segments (Kbytes)
SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited
CKPTINTVL 900 # Check point interval (in sec)
TXTIMEOUT 0x12c # Transaction timeout (in sec)
STACKSIZE 512 # 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 0
LTXHWM 35
LTXEHWM 45

# 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 /opt/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_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 0,0 # 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 /tmp/bar_act.log # ON-Bar Log file - not in /tmp please
BAR_DEBUG_LOG /tmp/bar_dbug.log # ON-Bar Debug Log - not in /tmp please
BAR_MAX_BACKUP 0
BAR_RETRY 1
BAR_NB_XPORT_COUNT 10
BAR_XFER_BUF_SIZE 31
RESTARTABLE_RESTORE off
BAR_PROGRESS_FREQ 0

# Informix Storage Manager variables
ISM_DATA_POOL ISMData
ISM_LOG_POOL ISMLogs

# Read Ahead Variables
RA_PAGES 32 # Number of pages to attempt to read ahead
RA_THRESHOLD 28 # 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 temp0 # 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 /opt/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 80 # Maximum allowed pdqpriority
DS_MAX_QUERIES 10 # Maximum number of decision support queries
DS_TOTAL_MEMORY 245760 # 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 0 # To hint the optimizer

DIRECTIVES 1 # Optimizer DIRECTIVES ON (1/Default) or OFF (0)

ONDBSPACEDOWN 0 # 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 /opt/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)

#
# The following are default settings for enabling Java in the database.
# Replace all occurrences of /usr/informix with the value of /opt/informix.

JVPJAVAHOME /opt/informix/extend/krakatoa/jre

# JRE installation root directory
JVPHOME /opt/informix/extend/krakatoa # Krakatoa installation directory

JVPPROPFILE /opt/informix/extend/krakatoa/.jvpprops # JVP property file
JVPLOGFILE /opt/informix/Logs/jvp.log # JVP log file.

JDKVERSION 1.3 # JDK version supported by this server

# The path to the JRE libraries relative to JVPJAVAHOME
JVPJAVALIB /lib/PA_RISC

# The JRE libraries to use for the Java VM

JVPJAVAVM hpi:server: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 /opt/informix/extend/krakatoa/krakatoa_g.jar:/opt/informix/extend/krakatoa/jdbc_g.jar
JVPCLASSPATH /opt/informix/extend/krakatoa/krakatoa.jar:/opt/informix/extend/krakatoa/jdbc.jar
RESIDENT 0 # Forced residency flag (Yes = 1, No = 0)
EXTSHMADD 8192 # Size of new extension shared memory segments (Kbytes)
ONLIDX_MAXMEM 5120 # Per pool per index (Kbytes)
LISTEN_TIMEOUT 10 # Timeout (in Seconds)
IFX_FOLDVIEW 0 # fold multiple tables or union all view with ansi joins
NUMCPUVPS 3 # Number of user (cpu) vps
NOAGE 0 # Process aging
AFF_SPROC 0 # Affinity start processor
AFF_NPROCS 0 # Affinity number of processors
NUMAIOVPS 3 # Number of IO vps

DD_HASHSIZE 101 # Set 5/5/2008 as per B.Pang - Abtech sys
DD_HASHMAX 20

IBM Informix Dynamic Server Version 10.00.HC5 -- On-Line -- Up 2 days 23:58:42 -- 591028 Kbytes

Profile
dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
25948698 84051523 3811712387 99.33 1153692 7544307 181137449 99.55

isamtot open start read write rewrite delete commit rollbk
2627748403 90544476 251539174 1563253711 58314988 2347689 329232 270095 222

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 115043.47 12873.40 365 734

bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
3011346 41 2769673454 0 0 295 6592869 14355320

ixda-RA idx-RA da-RA RA-pgsused lchwaits
8983783 1129973 7040984 17098680 2620933

Messages In This Thread

• Buffer Turnover Rate question
  BRIAN AMSTUTZ -- Wednesday, 15 July 2009, at 2:15 p.m.
  • RE: Buffer Turnover Rate question
    Art S. Kagel -- Wednesday, 15 July 2009, at 11:41 p.m.
    • RE: Buffer Turnover Rate question
      Brian Amstutz -- Thursday, 16 July 2009, at 5:35 p.m.
      • Re: Buffer Turnover Rate question
        Art Kagel -- Thursday, 16 July 2009, at 6:18 p.m.

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