The metrics reported by ratios are indicators that you need to investigate =
further. Combining the very high BTR with the slightly low RAU i'd say tha=
t you need more buffers. How many? Hard to say. The BTR indicates that t=
he answer may be as high as 6X the current cache. But you should try to est=
imate your working set o data from application needs.=20
Art=20
-----Original Message-----
From: BRIAN AMSTUTZ <brian.amstutz@asburyseminary.edu>
Sent: Wednesday, July 15, 2009 2:15 PM
To: ids@iiug.org
Subject: Buffer Turnover Rate question [16409]
HPUX 11vi2, 4x440MHz cpu, 8GB RAM, Informix 10.00.HC5=20
I just recently downloaded the ratios.ksh script and started running it. I'=
m=20
not noticing any performance problems as such but it seems like the BTR is=
=20
quite high. onstat -c and onstat -p output is included below. Anything to=20
worry about? Thanks! -bla=20
ReadAhead Utilization (UR): 99.6735 %=20
Bufwaits Ratio(BR): 1.13657 %=20
Average Buffer Turnover Rate (BTR): 36.9059/HR=20
Stats reset 71:40:00 ago.=20
IBM Informix Dynamic Server Version 10.00.HC5 -- On-Line -- Up 2 days 23:47=
:25=20
-- 591028 Kbytes=20
Configuration File: /opt/informix/etc/onconf.cars=20
# Root Dbspace Configuration=20
ROOTNAME root # Root dbspace name=20
ROOTPATH /opt/informix/dev/root.1=20
# Path for device containing root dbspace=20
ROOTOFFSET 0 # Offset of root dbspace into device (Kbytes)=20
ROOTSIZE 1024000 # Size of root dbspace (Kbytes)=20
# Disk Mirroring Configuration Parameters=20
MIRROR 0 # Mirroring flag (Yes =3D 1, No =3D 0)=20
MIRRORPATH # Path for device containing mirrored root=20
MIRROROFFSET 0 # Offset into mirrored device (Kbytes)=20
# Physical Log Configuration=20
PHYSDBS root # Location (dbspace) of physical log=20
PHYSFILE 40960 # Physical log file size (Kbytes)=20
# Logical Log Configuration=20
LOGFILES 60 # Number of logical log files=20
LOGSIZE 14336 # Logical log size (Kbytes)=20
LOG_BACKUP_MODE MANUAL # Logical log backup mode (MANUAL, CONT)=20
# Security=20
# DBCREATE_PERMISSION:=20
# By default any user can create a database. Uncomment DBCREATE_PERMISSON t=
o=20
# limit database creation to a specific user. Add a new DBCREATE_PERMISSION=
=20
# line for each permitted user.=20
DBCREATE_PERMISSION informix=20
DBCREATE_PERMISSION root=20
# IFX_EXTEND_ROLE:=20
# 0 =3D> Disable use of EXTEND role to control who can register=20
# external routines. This is the default behaviour.=20
# 1 =3D> Enable use of EXTEND role to control who can register=20
# external routines.=20
IFX_EXTEND_ROLE 1 # To control the usage of EXTEND role.=20
# Tablespace Tablespace Configuration in Root Dbspace=20
TBLTBLFIRST 0 # First extent size (Kbytes) (0 =3D default)=20
TBLTBLNEXT 0 # Next extent size (Kbytes) (0 =3D default)=20
# Diagnostics=20
MSGPATH /opt/informix/Logs/cars.log # System message log file path=20
CONSOLE /dev/console # System console message path=20
# To automatically backup logical logs, edit alarmprogram.sh and set=20
# BACKUPLOGS=3DY=20
ALARMPROGRAM /opt/informix/etc/no_log.sh # Alarm program path=20
ALRM_ALL_EVENTS 0 # Triggers ALARMPROGRAM for any event occur=20
TBLSPACE_STATS 1 # Maintain tblspace statistics=20
# System Archive Tape Device=20
TAPEDEV /dev/rmt/1m # Tape device path=20
TAPEBLK 256 # Tape block size (Kbytes)=20
TAPESIZE 0 # Maximum amount of data to put on tape (Kbytes)=20
# Log Archive Tape Device=20
LTAPEDEV /dev/rmt/2m # Log tape device path=20
LTAPEBLK 32 # Log tape block size (Kbytes)=20
LTAPESIZE 0 # Max amount of data to put on log tape (Kbytes)=20
# Optical=20
STAGEBLOB # Informix Dynamic Server staging area=20
# System Configuration=20
SERVERNUM 1 # Unique id corresponding to a OnLine instance=20
DBSERVERNAME daniel3 # Name of default database server=20
DBSERVERALIASES daniel3tcp,carsmain_tcp # List of alternate dbservernames=20
NETTYPE ipcshm,3,250,CPU # Configure poll thread(s) for nettype=20
NETTYPE soctcp,3,,NET # Configure poll thread(s) for nettype=20
DEADLOCK_TIMEOUT 60 # Max time to wait of lock in distributed env.=20
MULTIPROCESSOR 1 # 0 for single-processor, 1 for multi-processor=20
SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps to one=20
# Shared Memory Parameters=20
BUFFERPOOL=20
size=3D2K,buffers=3D100000,lrus=3D29,lru_min_dirty=3D2.000000,lru_max_dirty=
=3D4.000000=20
LOCKS 512000 # Maximum number of locks=20
PHYSBUFF 64 # Physical log buffer size (Kbytes)=20
LOGBUFF 32 # Logical log buffer size (Kbytes)=20
CLEANERS 29 # Number of buffer cleaner processes=20
SHMBASE 0x0 # Shared memory base address=20
SHMVIRTSIZE 321536 # initial virtual shared memory segment size=20
SHMADD 32768 # Size of new shared memory segments (Kbytes)=20
SHMTOTAL 0 # Total shared memory (Kbytes). 0=3D>unlimited=20
CKPTINTVL 900 # Check point interval (in sec)=20
TXTIMEOUT 0x12c # Transaction timeout (in sec)=20
STACKSIZE 512 # Stack size (Kbytes)=20
# Dynamic Logging=20
# DYNAMIC_LOGS:=20
# 2 : server automatically add a new logical log when necessary. (ON)=20
# 1 : notify DBA to add new logical logs when necessary. (ON)=20
# 0 : cannot add logical log on the fly. (OFF)=20
#=20
# When dynamic logging is on, we can have higher values for LTXHWM/LTXEHWM,=
=20
# because the server can add new logical logs during long transaction=20
rollback.=20
# However, to limit the number of new logical logs being added, LTXHWM/LTXE=
HWM=20
# can be set to smaller values.=20
#=20
# If dynamic logging is off, LTXHWM/LTXEHWM need to be set to smaller value=
s=20
# to avoid long transaction rollback hanging the server due to lack of logi=
cal=20
# log space, i.e. 50/60 or lower.=20
#=20
# In case of system configured with CDR, the difference between LTXHWM and=
=20
# LTXEHWM should be atleast 30% so that we could minimize log overrun issue=
.=20
DYNAMIC_LOGS 0=20
LTXHWM 35=20
LTXEHWM 45=20
# System Page Size=20
# BUFFSIZE - OnLine no longer supports this configuration parameter.=20
# To determine the page size used by OnLine on your platform=20
# see the last line of output from the command, 'onstat -b'.=20
# Recovery Variables=20
# OFF_RECVRY_THREADS:=20
# Number of parallel worker threads during fast recovery or an offline=20
restore.=20
# ON_RECVRY_THREADS:=20
# Number of parallel worker threads during an online restore.=20
OFF_RECVRY_THREADS 10 # Default number of offline worker threads=20
ON_RECVRY_THREADS 1 # Default number of online worker threads=20
# Data Replication Variables=20
# DRAUTO: 0 manual, 1 retain type, 2 reverse type=20
DRAUTO 0 # DR automatic switchover=20
DRINTERVAL 30 # DR max time between DR buffer flushes (in sec)=20
DRTIMEOUT 30 # DR network timeout (in sec)=20
DRLOSTFOUND /opt/informix/etc/dr.lostfound # DR lost+found file path=20
DRIDXAUTO 0 # DR automatic index repair. 0=3Doff, 1=3Don=20
# CDR Variables=20
CDR_EVALTHREADS 1,2 # evaluator threads (per-cpu-vp,additional)=20
CDR_DSLOCKWAIT 5 # DS lockwait timeout (seconds)=20
CDR_QUEUEMEM 4096 # Maximum amount of memory for any CDR queue (Kbytes)=20
CDR_NIFCOMPRESS 0 # Link level compression (-1 never, 0 none, 9 max)=20
CDR_SERIAL 0,0 # Serial Column Sequence=20
CDR_DBSPACE # dbspace for syscdr database=20
CDR_QHDR_DBSPACE # CDR queue dbspace (default same as catalog)=20
CDR_QDATA_SBSPACE # List of CDR queue smart blob spaces=20
# CDR_MAX_DYNAMIC_LOGS=20
# -1 =3D> unlimited=20
# 0 =3D> disable dynamic log addition=20
# >0 =3D> limit the no. of dynamic log additions with the specified value.=
=20
# Max dynamic log requests that CDR can make within one server session.=20
CDR_MAX_DYNAMIC_LOGS 0 # Dynamic log addition disabled by default=20
# Backup/Restore variables=20
BAR_ACT_LOG /tmp/bar_act.log # ON-Bar Log file - not in /tmp please=20
BAR_DEBUG_LOG /tmp/bar_dbug.log # ON-Bar Debug Log - not in /tmp please=20
BAR_MAX_BACKUP 0=20
BAR_RETRY 1=20
BAR_NB_XPORT_COUNT 10=20
BAR_XFER_BUF_SIZE 31=20
RESTARTABLE_RESTORE off=20
BAR_PROGRESS_FREQ 0=20
# Informix Storage Manager variables=20
ISM_DATA_POOL ISMData=20
ISM_LOG_POOL ISMLogs=20
# Read Ahead Variables=20
RA_PAGES 32 # Number of pages to attempt to read ahead=20
RA_THRESHOLD 28 # Number of pages left before next group=20
# DBSPACETEMP:=20
# OnLine equivalent of DBTEMP for SE. This is the list of dbspaces=20
# that the OnLine SQL Engine will use to create temp tables etc.=20
# If specified it must be a colon separated list of dbspaces that exist=20
# when the OnLine system is brought online. If not specified, or if=20
# all dbspaces specified are invalid, various ad hoc queries will create=20
# temporary files in /tmp instead.=20
DBSPACETEMP temp0 # Default temp dbspaces=20
# DUMP*:=20
# The following parameters control the type of diagnostics information whic=
h=20
# is preserved when an unanticipated error condition (assertion failure)=20
occurs=20
# during OnLine operations.=20
# For DUMPSHMEM, DUMPGCORE and DUMPCORE 1 means Yes, 0 means No.=20
DUMPDIR /opt/informix/tmp # Preserve diagnostics in this directory=20
DUMPSHMEM 1 # Dump a copy of shared memory=20
DUMPGCORE 0 # Dump a core image using 'gcore'=20
DUMPCORE 0 # Dump a core image (Warning:this aborts OnLine)=20
DUMPCNT 1 # Number of shared memory or gcore dumps for=20
# a single user's session=20
FILLFACTOR 90 # Fill factor for building indexes=20
# method for OnLine to use when determining current time=20
USEOSTIME 0 # 0: use internal time(fast), 1: get time from OS(slow)=20
# Parallel Database Queries (pdq)=20
MAX_PDQPRIORITY 80 # Maximum allowed pdqpriority=20
DS_MAX_QUERIES 10 # Maximum number of decision support queries=20
DS_TOTAL_MEMORY 245760 # Decision support memory (Kbytes)=20
DS_MAX_SCANS 1048576 # Maximum number of decision support scans=20
DS_NONPDQ_QUERY_MEM 128 # Non PDQ query memory (Kbytes)=20
DATASKIP off # List of dbspaces to skip=20
# OPTCOMPIND=20
# 0 =3D> Nested loop joins will be preferred (where=20
# possible) over sortmerge joins and hash joins.=20
# 1 =3D> If the transaction isolation mode is not=20
# "repeatable read", optimizer behaves as in (2)=20
# below. Otherwise it behaves as in (0) above.=20
# 2 =3D> Use costs regardless of the transaction isolation=20
# mode. Nested loop joins are not necessarily=20
# preferred. Optimizer bases its decision purely=20
# on costs.=20
OPTCOMPIND 0 # To hint the optimizer=20
DIRECTIVES 1 # Optimizer DIRECTIVES ON (1/Default) or OFF (0)=20
ONDBSPACEDOWN 0 # Dbspace down option: 0 =3D CONTINUE, 1 =3D ABORT, 2 =3D W=
AIT=20
OPCACHEMAX 0 # Maximum optical cache size (Kbytes)=20
# HETERO_COMMIT (Gateway participation in distributed transactions)=20
# 1 =3D> Heterogeneous Commit is enabled=20
# 0 (or any other value) =3D> Heterogeneous Commit is disabled=20
HETERO_COMMIT 0=20
SBSPACENAME # Default smartblob space name - this is where blobs=20
# go if no sbspace is specified when the smartblob is=20
# created. It is also used by some datablades as=20
# the location to put their smartblobs.=20
SYSSBSPACENAME # Default smartblob space for use by the Informix=20
# Server. This is used primarily for Informix Server=20
# system statistics collection.=20
BLOCKTIMEOUT 3600 # Default timeout for system block=20
SYSALARMPROGRAM /opt/informix/etc/evidence.sh # System Alarm program path=20
# Optimization goal: -1 =3D ALL_ROWS(Default), 0 =3D FIRST_ROWS=20
OPT_GOAL -1=20
ALLOW_NEWLINE 0 # embedded newlines(Yes =3D 1, No =3D 0 or anything but 1)=
=20
#=20
# The following are default settings for enabling Java in the database.=20
# Replace all occurrences of /usr/informix with the value of /opt/informix.=
=20
JVPJAVAHOME /opt/informix/extend/krakatoa/jre=20
# JRE installation root directory=20
JVPHOME /opt/informix/extend/krakatoa # Krakatoa installation directory=20
JVPPROPFILE /opt/informix/extend/krakatoa/.jvpprops # JVP property file=20
JVPLOGFILE /opt/informix/Logs/jvp.log # JVP log file.=20
JDKVERSION 1.3 # JDK version supported by this server=20
# The path to the JRE libraries relative to JVPJAVAHOME=20
JVPJAVALIB /lib/PA_RISC=20
# The JRE libraries to use for the Java VM=20
JVPJAVAVM hpi:server:java:net:zip:jpeg=20
# use JVPARGS to change Java VM configuration=20
#To display jni call=20
#JVPARGS -verbose:jni=20
# Classpath to use upon Java VM start-up (use _g version for debugging)=20
#JVPCLASSPATH=20
/opt/informix/extend/krakatoa/krakatoa_g.jar:/opt/informix/extend/krakatoa/=
jdbc_g.jar=20
JVPCLASSPATH=20
/opt/informix/extend/krakatoa/krakatoa.jar:/opt/informix/extend/krakatoa/jd=
bc.jar=20
RESIDENT 0 # Forced residency flag (Yes =3D 1, No =3D 0)=20
EXTSHMADD 8192 # Size of new extension shared memory segments (Kbytes)=20
ONLIDX_MAXMEM 5120 # Per pool per index (Kbytes)=20
LISTEN_TIMEOUT 10 # Timeout (in Seconds)=20
IFX_FOLDVIEW 0 # fold multiple tables or union all view with ansi joins=20
NUMCPUVPS 3 # Number of user (cpu) vps=20
NOAGE 0 # Process aging=20
AFF_SPROC 0 # Affinity start processor=20
AFF_NPROCS 0 # Affinity number of processors=20
NUMAIOVPS 3 # Number of IO vps=20
DD_HASHSIZE 101 # Set 5/5/2008 as per B.Pang - Abtech sys=20
DD_HASHMAX 20=20
IBM Informix Dynamic Server Version 10.00.HC5 -- On-Line -- Up 2 days 23:58=
:42=20
-- 591028 Kbytes=20
Profile=20
dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached=20
25948698 84051523 3811712387 99.33 1153692 7544307 181137449 99.55=20
isamtot open start read write rewrite delete commit rollbk=20
2627748403 90544476 251539174 1563253711 58314988 2347689 329232 270095 222=
=20
gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs=20
0 0 0 0 0 0 0=20
ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes=20
0 0 0 115043.47 12873.40 365 734=20
bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans=20
3011346 41 2769673454 0 0 295 6592869 14355320=20
ixda-RA idx-RA da-RA RA-pgsused lchwaits=20
8983783 1129973 7040984 17098680 2620933=20
***************************************************************************=
****=20
Forum Note: Use "Reply" to post a response in the discussion forum.=20
