IDS Forum

RE: Application slow and data not saved

Posted By: Marcus Haarmann
Date: Wednesday, 11 November 2009, at 8:23 a.m.

In Response To: Application slow and data not saved (MUMIN MARJUKI)

Hi,

you are definitely suffering from too low buffers.
If your system really has 1GB mem, see how much is available and give it

to BUFFERS (8000 is REALLY few, we have systems running with 2GB or
more,
in 32bit you are limited to somewhat round 3GB in total, but your
machine
has not enough memory to grant this amount.)

Monitor onstat -g seg if your shared memory is full, so users would be
rejected.
In this case, increase SHMVIRTSIZE also (each connection eats up shared
memory,
so when you have more users than in the past, you have to modify the
parameter).
You did not mention the number of users working or the number of
sessions.
Currently, your instance is working on 50MB of memory, while 1GB is
available.
Assuming you have other stuff running, (second instance ?, application
on same server ?)
I would try to set BUFFERS to 100000, SHMVIRTSIZE to 50000
(in case you have the necessary memory available) and then restart the
instance.
Monitor onstat -p and the buffer usage, maybe you get better results by
using higher values.
This should have a good effect for overall performance,
and of course in the read cache%.

Another option: do you perform update statistics periodically ?
Do you have sequential sqans on some tables ?
Do you have highly fragmented tables ?

As already said, you are running a very old unsupported instance.

Marcus

-----Original Message-----
From: MUMIN MARJUKI [mailto:mumin@akapost.com]
Sent: Wednesday, November 11, 2009 3:28 AM
To: ids@iiug.org
Subject: Application slow and data not saved [18044]

Hi,

I have IDS v7.30.UC7 running on Solaris 2.6 with 1024Mb RAM and 1 CPU
400Mhz .
There is 2 application db at this IDS. The problem is application will
running slow and sometime data cannot be saved when more user used this
application.
This application already running about 8 years and now it become slow..

this is onstat -p output :

Informix Dynamic Server Version 7.30.UC7 -- On-Line -- Up 2 days
00:14:22 --
50688 Kbytes

Profile
dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
30945890 4485340 140820758 78.02 63142 251189 609906 89.65

isamtot open start read write rewrite delete commit rollbk
4122988 338018 649682 1248899 81844 10734 911 4852 918

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
39755.92 1429.96 529 1158

bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
7385086 711 3337555672 188 0 57 2095 42989

ixda-RA idx-RA da-RA RA-pgsused lchwaits
145303 1137 29458137 29599384 0

and this is my onconfig file :

Informix Dynamic Server Version 7.30.UC7 -- On-Line -- Up 2 days
00:15:09 --
50688 Kbytes

Configuration File: /home1/informix/etc/onconfig.spplbp
#***********************************************************************
***
#
# INFORMIX SOFTWARE, INC.
#
# Title: onconfig.std
# Description: INFORMIX-OnLine Configuration Parameters #
#***********************************************************************
***

# Root Dbspace Configuration

ROOTNAME rootdbs # Root dbspace name
ROOTPATH /home1/dataspace/rootchunk

# Path for device containing root dbspace ROOTOFFSET 1024 # 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 rootdbs # Location (dbspace) of physical log PHYSFILE 10000 #
Physical log file size (Kbytes)

# Logical Log Configuration

LOGFILES 20 # Number of logical log files LOGSIZE 20000 # Logical log
size (Kbytes)

# Diagnostics

MSGPATH /home1/informix/online.log # System message log file path
CONSOLE /dev/console # System console message path ALARMPROGRAM
/home1/informix/etc/no_log.sh # Alarm program path

# System Archive Tape Device

TAPEDEV /dev/rst4 # Tape device path
TAPEBLK 16 # Tape block size (Kbytes)
TAPESIZE 12000000 # Maximum amount of data to put on tape (Kbytes)
#TAPESIZE 2097152 # Maximum amount of data to put on tape (Kbytes)

# Log Archive Tape Device

LTAPEDEV /dev/rst5 # Log tape device path LTAPEBLK 16 # Log tape block
size (Kbytes) LTAPESIZE 12000000 # Max amount of data to put on log tape
(Kbytes)

# Optical

STAGEBLOB # INFORMIX-OnLine/Optical staging area

# System Configuration

SERVERNUM 1 # Unique id corresponding to a OnLine instance DBSERVERNAME
online_spplbp # Name of default database server DBSERVERALIASES # List
of alternate dbservernames NETTYPE tlitcp,1,200,CPU # Override sqlhosts
nettype parameters #NETTYPE ipcshm,1,200,CPU # Override sqlhosts nettype
parameters DEADLOCK_TIMEOUT 60 # Max time to wait of lock in distributed
env.
RESIDENT 0 # Forced residency flag (Yes = 1, No = 0)

MULTIPROCESSOR 0 # 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 10000 # Maximum number of locks
BUFFERS 8000 # Maximum number of shared buffers NUMAIOVPS 4 # Number of
IO vps PHYSBUFF 128 # Physical log buffer size (Kbytes) LOGBUFF 64 #
Logical log buffer size (Kbytes) LOGSMAX 40 # Maximum number of logical
log files CLEANERS 4 # Number of buffer cleaner processes SHMBASE
0xa000000 # Shared memory base address SHMVIRTSIZE 8000 # initial
virtual shared memory segment size SHMADD 8192 # Size of new shared
memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes).
0=>unlimited CKPTINTVL 300 # Check point interval (in sec) LRUS 8 #
Number of LRU queues LRU_MAX_DIRTY 60 # LRU percent dirty begin cleaning
limit LRU_MIN_DIRTY 50 # LRU percent dirty end cleaning limit LTXHWM 50
# Long transaction high water mark percentage LTXEHWM 60 # Long
transaction high water mark (exclusive) TXTIMEOUT 0x12c # Transaction
timeout (in sec) STACKSIZE 32 # Stack size (Kbytes)

# 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
/home1/informix/dr.lostfound # DR lost+found file path

# 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 tempchunk1 # 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 /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

# ADT*
# The following parameters control the type and level of secure auditing
# present in the OnLine system. By default, ADTMODE is 0 and auditing #
is disabled

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)

# OFF => 0, LOW => 1, HIGH => 100
MAX_PDQPRIORITY 100 # Maximum allowed pdqpriority DS_MAX_QUERIES #
Maximum number of decision support queries DS_TOTAL_MEMORY # Decision
support memory (Kbytes) DS_MAX_SCANS 1048576 # Maximum number of
decision support scans 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

ONDBSPACEDOWN 0 # Dbspace down option: 0 = CONTINUE, 1 = ABORT, 2 = WAIT
LBU_PRESERVE 0 # Preserve last log for log backup OPCACHEMAX 0 # Maximum
optical cache size (Kbytes) SYSALARMPROGRAM
/home1/informix/etc/evidence.sh # System Alarm program path
TBLSPACE_STATS 1 CDR_LOGBUFFERS 2048 # size of log reading buffer pool
(Kbytes) CDR_EVALTHREADS 1,1 # 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) BAR_ACT_LOG
/tmp/bar_act.log BAR_MAX_BACKUP 4 BAR_RETRY 1 BAR_NB_XPORT_COUNT 10
BAR_XFER_BUF_SIZE 31 ISM_DATA_POOL ISMData # If the data pool name is
changed, be sure to ISM_LOG_POOL ISMLogs HETERO_COMMIT 0 OPT_GOAL -1
DIRECTIVES 1 RESTARTABLE_RESTORE off

I think bufwaits little bit high at onstat -p.
Does anything wrong with my onconfig file?

thanks

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Messages In This Thread

• Application slow and data not saved
  MUMIN MARJUKI -- Tuesday, 10 November 2009, at 9:28 p.m.
  • Re: Application slow and data not saved
    Jonathan Leffler -- Tuesday, 10 November 2009, at 10:57 p.m.
    • Re: Application slow and data not saved
      James Horn -- Wednesday, 11 November 2009, at 9:55 a.m.
    • Re: Application slow and data not saved
      Jonathan Leffler -- Thursday, 12 November 2009, at 10:26 p.m.
  • RE: Application slow and data not saved
    Marcus Haarmann -- Wednesday, 11 November 2009, at 8:23 a.m.
  • Re: Application slow and data not saved
    Art Kagel -- Wednesday, 11 November 2009, at 10:33 p.m.
    • Re: Application slow and data not saved
      Peter_Logan@spartanstores.com -- Thursday, 12 November 2009, at 8:25 a.m.
      • Re: Application slow and data not saved
        Art Kagel -- Thursday, 12 November 2009, at 8:30 a.m.
        • Re: Application slow and data not saved
          Peter_Logan@spartanstores.com -- Thursday, 12 November 2009, at 8:37 a.m.
    • Re: Application slow and data not saved
      MUMIN MARJUKI -- Thursday, 12 November 2009, at 11:28 p.m.
      • Re: Application slow and data not saved
        MUMIN MARJUKI -- Friday, 13 November 2009, at 1:31 a.m.

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