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IDS Forum

Optimizer Question

Posted By: Mary Gregory
Date: Wednesday, 6 June 2007, at 10:07 a.m.

Could the addition of memory to IDS (BUFFERS, SHMVIRTSIZE) cause the
optimizer to act differently? Over the past month or two we've added
memory to our server and increased these two parameters (as well as
CLEANERS and LRUS) and we keep coming across queries that have run for
years and now take forever to complete. We are still running update
statistics like we always have, and nothing has changed with any table
structures, indexes or programs. Here is a little info about our
system:

HPUX 11.11

6 CPU's

12 GB Memory

IDS 9.40.FC4

Some of the config File:

# Root Dbspace Configuration
ROOTNAME a_rootdbs # Root dbspace name
ROOTPATH /dev/inf/chunk001 # Path for device containing root
dbspace
ROOTOFFSET 0 # Offset of root dbspace into device
(Kbytes)
ROOTSIZE 500000 # Size of root dbspace (Kbytes)
# Physical Log Configuration
PHYSDBS a_plogdbs # Location (dbspace) of physical log
PHYSFILE 100000 # Physical log file size (Kbytes)
# Logical Log Configuration
LOGFILES 41 # Number of logical log files
#LOGSIZE 2000 # Logical log size (Kbytes)
LOGSIZE 50000 # Logical log size (Kbytes)

ALARMPROGRAM /home/informix/9.40/etc/log_full.sh # Alarm program path
TBLSPACE_STATS 1 # Maintain tblspace statistics

# System Configuration

SERVERNUM 1 # Unique id corresponding to a OnLine
instance
DBSERVERNAME online_shm # Name of default database server
DBSERVERALIASES online_tcp # List of alternate dbservernames
NETTYPE ipcshm,3,75,CPU # Configure poll thread(s) for nettype
NETTYPE soctcp,6,200,NET # Configure poll thread(s) for nettype
DEADLOCK_TIMEOUT 240 # 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 5 # 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 500000 # Maximum number of locks
BUFFERS 200000 # Maximum number of shared buffers
NUMAIOVPS 2 # Number of IO vps
PHYSBUFF 64 # Physical log buffer size (Kbytes)
LOGBUFF 64 # Logical log buffer size (Kbytes)
CLEANERS 127 # 5/10/07 M. Gregory
SHMBASE 0x0 # Shared memory base address
SHMVIRTSIZE 1792000 # initial virtual shared memory segment
size
SHMADD 256000 # Size of new shared memory segments
(Kbytes)
SHMTOTAL 6292484 # Total shared memory (Kbytes).
0=>unlimited
CKPTINTVL 600 # Check point interval (in sec)
LRUS 127 # 5/10/07 - M. Gregory
LRU_MAX_DIRTY 4.000 # LRU percent dirty begin cleaning limit
LRU_MIN_DIRTY 2.000 # LRU percent dirty end cleaning limit
TXTIMEOUT 0x12c # Transaction timeout (in sec)
STACKSIZE 64 # Stack size (Kbytes)

DYNAMIC_LOGS 2
LTXHWM 40
LTXEHWM 55

OFF_RECVRY_THREADS 30 # Default number of offline worker
threads
ON_RECVRY_THREADS 20 # Default number of online worker
threads

# 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 0 # Dynamic log addition disabled by
default
# Read Ahead Variables
RA_PAGES 20 # Number of pages to attempt to read
ahead
RA_THRESHOLD 8 # Number of pages left before next group

# DBSPACETEMP:
DBSPACETEMP
tempdbs1,tempdbs2,tempdbs3,tempdbs4,tempdbs5,tempdbs6,tempdbs7

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 0 # Maximum allowed pdqpriority
#DS_MAX_QUERIES # Maximum number of decision support
queries
#DS_TOTAL_MEMORY # Decision support memory (Kbytes) TURN THIS
OFF AFTER THE IMPORT
DS_TOTAL_MEMORY # Decision support memory (Kbytes) TURN
THIS OFF AFTER THE IMPORT
DS_MAX_SCANS 1048576 # Maximum number of decision support
scans
DATASKIP off
# 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)

BLOCKTIMEOUT 3600 # Default timeout for system block
SYSALARMPROGRAM /home/informix/9.40/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)

BAR_BSALIB_PATH /opt/omni/lib/libob2informix_64bit.sl
DS_MAX_QUERIES 6 # Maximum number of decision support
queries

And our onstat -p output:

Profile

dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached

853365810 1694740843 21147087047 95.96 32177895 72548903 233327825
86.21

isamtot open start read write rewrite delete commit
rollbk

16032208597 74657947 503175174 12697405047 52576047 12624733 7721511
10778784 4

599

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 193051.85 123974.95 1063 3084

bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans

77516285 3282 20350227577 7 0 2145 4501445
3945343

ixda-RA idx-RA da-RA RA-pgsused lchwaits

343504294 25831160 120490006 486820227 19178796

Mary Gregory
Senior Systems Programmer
Rheem Water Heating
Office (334) 260-1460
Cell (334) 462-1852
mgregory@rheem.com

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