Personal tools
You are here: Home Forums DB2 package cache hit ratio is so less????
Navigation
Log in


Forgot your password?
 
Document Actions

package cache hit ratio is so less????

Up to DB2

package cache hit ratio is so less????

Posted by Pawan at July 21. 2008


Hi ,
i am facing problem in package cache hit ratio its between 37-45%
which is very less.

here are my database configuration snapshot


Database Configuration for Database tamlogin

Database configuration release level = 0x0a00
Database release level = 0x0a00

Database territory = US
Database code page = 1208
Database code set = UTF-8
Database country/region code = 1
Database collating sequence = BINARY
Alternate collating sequence (ALT_COLLATE) =
Database page size = 4096

Dynamic SQL Query management (DYN_QUERY_MGMT) = DISABLE

Discovery support for this database (DISCOVER_DB) = ENABLE

Default query optimization class (DFT_QUERYOPT) = 5
Degree of parallelism (DFT_DEGREE) = 1
Continue upon arithmetic exceptions (DFT_SQLMATHWARN) = NO
Default refresh age (DFT_REFRESH_AGE) = 0
Default maintained table types for opt (DFT_MTTB_TYPES) = SYSTEM
Number of frequent values retained (NUM_FREQVALUES) = 10
Number of quantiles retained (NUM_QUANTILES) = 20

Backup pending = NO

Database is consistent = NO
Rollforward pending = NO
Restore pending = NO

Multi-page file allocation enabled = YES

Log retain for recovery status = RECOVERY
User exit for logging status = NO

Data Links Token Expiry Interval (sec) (DL_EXPINT) = 60
Data Links Write Token Init Expiry Intvl(DL_WT_IEXPINT) = 60
Data Links Number of Copies (DL_NUM_COPIES) = 1
Data Links Time after Drop (days) (DL_TIME_DROP) = 1
Data Links Token in Uppercase (DL_UPPER) = NO
Database heap (4KB) (DBHEAP) = 1200
Size of database shared memory (4KB) (DATABASE_MEMORY) = AUTOMATIC
Catalog cache size (4KB) (CATALOGCACHE_SZ) = (MAXAPPLS*4)
Log buffer size (4KB) (LOGBUFSZ) = 128
Utilities heap size (4KB) (UTIL_HEAP_SZ) = 5000
Buffer pool size (pages) (BUFFPAGE) = 1000
Extended storage segments size (4KB) (ESTORE_SEG_SZ) = 16000
Number of extended storage segments (NUM_ESTORE_SEGS) = 0
Max storage for lock list (4KB) (LOCKLIST) = 8096

Max size of appl. group mem set (4KB) (APPGROUP_MEM_SZ) = 30000
Percent of mem for appl. group heap (GROUPHEAP_RATIO) = 70
Max appl. control heap size (4KB) (APP_CTL_HEAP_SZ) = 128

Sort heap thres for shared sorts (4KB) (SHEAPTHRES_SHR) = (SHEAPTHRES)
Sort list heap (4KB) (SORTHEAP) = 256
SQL statement heap (4KB) (STMTHEAP) = 2048
Default application heap (4KB) (APPLHEAPSZ) = 256
Package cache size (4KB) (PCKCACHESZ) = (MAXAPPLS*8)
Statistics heap size (4KB) (STAT_HEAP_SZ) = 4384

Interval for checking deadlock (ms) (DLCHKTIME) = 10000
Percent. of lock lists per application (MAXLOCKS) = 15
Lock timeout (sec) (LOCKTIMEOUT) = -1

Changed pages threshold (CHNGPGS_THRESH) = 60
Number of asynchronous page cleaners (NUM_IOCLEANERS) = 1
Number of I/O servers (NUM_IOSERVERS) = 3
Index sort flag (INDEXSORT) = YES
Sequential detect flag (SEQDETECT) = YES
Default prefetch size (pages) (DFT_PREFETCH_SZ) = AUTOMATIC

Track modified pages (TRACKMOD) = OFF

Default number of containers = 1
Default tablespace extentsize (pages) (DFT_EXTENT_SZ) = 32

Max number of active applications (MAXAPPLS) = AUTOMATIC
Average number of active applications (AVG_APPLS) = 1
Max DB files open per application (MAXFILOP) = 64

Log file size (4KB) (LOGFILSIZ) = 1000
Number of primary log files (LOGPRIMARY) = 3
Number of secondary log files (LOGSECOND) = 2
Changed path to log files (NEWLOGPATH) =
Path to log files = /san/db/smsdb/smsdb/NODE0000/SQL00001/SQLOGDIR/
Overflow log path (OVERFLOWLOGPATH) =
Mirror log path (MIRRORLOGPATH) =
First active log file = S0000858.LOG
Block log on disk full (BLK_LOG_DSK_FUL) = NO
Percent of max active log space by transaction(MAX_LOG) = 0
Num. of active log files for 1 active UOW(NUM_LOG_SPAN) = 0

Group commit count (MINCOMMIT) = 1
Percent log file reclaimed before soft chckpt (SOFTMAX) = 100
Log retain for recovery enabled (LOGRETAIN) = RECOVERY
User exit for logging enabled (USEREXIT) = OFF

HADR database role = STANDARD
HADR local host name (HADR_LOCAL_HOST) =
HADR local service name (HADR_LOCAL_SVC) =
HADR remote host name (HADR_REMOTE_HOST) =
HADR remote service name (HADR_REMOTE_SVC) =
HADR instance name of remote server (HADR_REMOTE_INST) =
HADR timeout value (HADR_TIMEOUT) = 120
HADR log write synchronization mode (HADR_SYNCMODE) = NEARSYNC

First log archive method (LOGARCHMETH1) = LOGRETAIN
Options for logarchmeth1 (LOGARCHOPT1) =
Second log archive method (LOGARCHMETH2) = OFF
Options for logarchmeth2 (LOGARCHOPT2) =
Failover log archive path (FAILARCHPATH) =
Number of log archive retries on error (NUMARCHRETRY) = 5
Log archive retry Delay (secs) (ARCHRETRYDELAY) = 20
Vendor options (VENDOROPT) =

Auto restart enabled (AUTORESTART) = ON
Index re-creation time and redo index build (INDEXREC) = SYSTEM (RESTART)
Log pages during index build (LOGINDEXBUILD) = OFF
Default number of loadrec sessions (DFT_LOADREC_SES) = 1
Number of database backups to retain (NUM_DB_BACKUPS) = 12
Recovery history retention (days) (REC_HIS_RETENTN) = 366

TSM management class (TSM_MGMTCLASS) =
TSM node name (TSM_NODENAME) =


I update parameter PCKCACHESZ by 2000 but hit ratio same then by 4096 and again then by 8096 but the hit ration is still same...please look the snapshot and suggest what to do for increasing package hit ratio....

waiting for the reply...


__________________
Regards
Pawan Kumar

Powered by Ploneboard
Security Awareness
Would you like your company to implement gamification into your security awareness program?





Polls