DB2 MAXFILOP

12 December,2011 by Jack Vamvas

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

Author: Jack Vamvas(http://www.dba-db2.com)
Author: Jack Vamvas(http://www.dba-db2.com)

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