While troubleshooting a DB2 performance problem for Websphere Portal 6.1.0 using DB2 9.5 Enterprise Edition , one of the DB2 tuning recommendations from the Portal Tuning guide was to set MAXFILOP = 512 or higher
MAXFILOP is the Maximum database files open per application configuration parameter.
What level to set it?
The MAXFILOP parameter defines the maximum file handles that can be opened by a database agent. If the number is to small , a CPU overhead is incurred.
To view the existing MAXFILOP value do a :
db2 get db cfg for WMMDB | grep 'MAXFILOP'
One method of assessing the right level is to monitor the Database Snapshots. If the Database Snapshots regularly show "Database Files Closed > 0" then the MAXFILOP is one configuration to increase.
To view the Database Files Closed > 0 , turn on DFT_MON_BUFPOOL with :
db2 “update dbm cfg using DFT_MON_BUFPOOL”
db2 "get snapshot for database on myDB"
Look for Database Files Closed. If the Database Files Closed is greater than zero , consider increasing MAXFILOP
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