Hi all,
I am facing severe performance problem. We are using DB2 9.1 for windows.
We got most of the time 95-100% CPU usage where db2syscs utilized 85-90%.We are using Misys's Trade Innovation application.

My Database backup size is more than 6GB.
Hardware is IBM xSeries_346, Intel(R) Xeon(TM) CPU 3.20GHz 3.20 GHz, 6 GB RAM.
I am explaining configuration parameter.
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Database Manager Configuration

Node type = Database Server with local and remote clients
Database manager configuration release level = 0x0b00
Maximum total of files open (MAXTOTFILOP) = 16000
CPU speed (millisec/instruction) (CPUSPEED) = 2.361721e-007
Max number of concurrently active databases (NUMDB) = 8
Federated Database System Support (FEDERATED) = NO
Transaction processor monitor name (TP_MON_NAME) =
Default charge-back account (DFT_ACCOUNT_STR) =
Java Development Kit installation path (JDK_PATH) = C:\Program Files\IBM\SQLLIB\java\jdk
Diagnostic error capture level (DIAGLEVEL) = 3
Notify Level (NOTIFYLEVEL) = 3
Diagnostic data directory path (DIAGPATH) =
Default database monitor switches
Buffer pool (DFT_MON_BUFPOOL) = OFF
Lock (DFT_MON_LOCK) = OFF
Sort (DFT_MON_SORT) = OFF
Statement (DFT_MON_STMT) = OFF
Table (DFT_MON_TABLE) = OFF
Timestamp (DFT_MON_TIMESTAMP) = ON
Unit of work (DFT_MON_UOW) = OFF
Monitor health of instance and databases (HEALTH_MON) = ON
SYSADM group name (SYSADM_GROUP) =
SYSCTRL group name (SYSCTRL_GROUP) =
SYSMAINT group name (SYSMAINT_GROUP) =
SYSMON group name (SYSMON_GROUP) =
Client Userid-Password Plugin (CLNT_PW_PLUGIN) =
Client Kerberos Plugin (CLNT_KRB_PLUGIN) = IBMkrb5
Group Plugin (GROUP_PLUGIN) =
GSS Plugin for Local Authorization (LOCAL_GSSPLUGIN) =
Server Plugin Mode (SRV_PLUGIN_MODE) = UNFENCED
Server List of GSS Plugins (SRVCON_GSSPLUGIN_LIST) =
Server Userid-Password Plugin (SRVCON_PW_PLUGIN) =
Server Connection Authentication (SRVCON_AUTH) = NOT_SPECIFIED
Database manager authentication (AUTHENTICATION) = SERVER
Cataloging allowed without authority (CATALOG_NOAUTH) = NO
Trust all clients (TRUST_ALLCLNTS) = YES
Trusted client authentication (TRUST_CLNTAUTH) = CLIENT
Bypass federated authentication (FED_NOAUTH) = NO
Default database path (DFTDBPATH) = C:
Database monitor heap size (4KB) (MON_HEAP_SZ) = 256
Java Virtual Machine heap size (4KB) (JAVA_HEAP_SZ) = 2048
Audit buffer size (4KB) (AUDIT_BUF_SZ) = 0
Size of instance shared memory (4KB) (INSTANCE_MEMORY) = AUTOMATIC
Backup buffer default size (4KB) (BACKBUFSZ) = 1024
Restore buffer default size (4KB) (RESTBUFSZ) = 1024
Agent stack size (AGENT_STACK_SZ) = 16
Minimum committed private memory (4KB) (MIN_PRIV_MEM) = 32
Private memory threshold (4KB) (PRIV_MEM_THRESH) = 20000
Sort heap threshold (4KB) (SHEAPTHRES) = 0
Directory cache support (DIR_CACHE) = YES
Application support layer heap size (4KB) (ASLHEAPSZ) = 15
Max requester I/O block size (bytes) (RQRIOBLK) = 32767
DOS requester I/O block size (bytes) (DOS_RQRIOBLK) = 4096
Query heap size (4KB) (QUERY_HEAP_SZ) = 1000
Workload impact by throttled utilities(UTIL_IMPACT_LIM) = 10
Priority of agents (AGENTPRI) = SYSTEM
Max number of existing agents (MAXAGENTS) = 200
Agent pool size (NUM_POOLAGENTS) = 100(calculated)
Initial number of agents in pool (NUM_INITAGENTS) = 0
Max number of coordinating agents (MAX_COORDAGENTS) = MAXAGENTS
Max no. of concurrent coordinating agents (MAXCAGENTS) = MAX_COORDAGENTS
Max number of client connections (MAX_CONNECTIONS) = MAX_COORDAGENTS
Keep fenced process (KEEPFENCED) = YES
Number of pooled fenced processes (FENCED_POOL) = MAX_COORDAGENTS
Initial number of fenced processes (NUM_INITFENCED) = 0
Index re-creation time and redo index build (INDEXREC) = RESTART
Transaction manager database name (TM_DATABASE) = 1ST_CONN
Transaction resync interval (sec) (RESYNC_INTERVAL) = 180
SPM name (SPM_NAME) = ABDHKTID
SPM log size (SPM_LOG_FILE_SZ) = 256
SPM resync agent limit (SPM_MAX_RESYNC) = 20
SPM log path (SPM_LOG_PATH) =
NetBIOS Workstation name (NNAME) =
TCP/IP Service name (SVCENAME) = db2inst1c
Discovery mode (DISCOVER) = SEARCH
Discover server instance (DISCOVER_INST) = ENABLE
Maximum query degree of parallelism (MAX_QUERYDEGREE) = ANY
Enable intra-partition parallelism (INTRA_PARALLEL) = NO
No. of int. communication buffers(4KB)(FCM_NUM_BUFFERS) = AUTOMATIC
No. of int. communication channels (FCM_NUM_CHANNELS) = AUTOMATIC
db2start/db2stop timeout (min) (START_STOP_TIME) = 10
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Also attached the DB2 configuration parameters.

Is there any configuration tunning for getting better performance?

Keenly awaiting for experts advice..............

With Regards
Humayun

take a snapshot for dynamic sql and check for total exec time which is high , check for queires which is doing tablescan using explain, high cpu utilization is coz bad sql statements
regds
paul

Hi Paul,

Thanks for your reply. Yesterday i got some db2 script for Index creation from my application vendor. Now it is working fine.
Anyways i may face the problem in future. Can you please tell me how to take snapshot for dynamic sql and check for total exec time ?

Waiting for your response...

____________
Best Regards
Humayun

on the monitors switches statement uow on
db2 get snapshot for dynamic sql on dbname
u will get all dynamic sql statements details
regds
Paul

Humayun,

Adding to Paul's suggestions I would like to give another option too. You can try the db2mon tool. Its a freeware and it works awesome. This tool helps you monitor the dynamic sql statements and it shows the CPU usage in time for each SQL. You can give a try !!!

Thanks

Surgeon......