DB2 process monitoring
======================

You should see several DB2 processes in the Task Manager window, including db2sec.exe, db2rcmd.exe, db2licd.exe, db2jds.exe, and db2syscs.exe. Most of these processes correspond to services available in the Services management console. The db2syscs.exe process is the primary database engine and db2syscs.exe processes are the DB2 agent processes. If agents are the primary resource users here, then the problem may be in the application SQL statements or in the database configuration. High resource usage in the other DB2 processes would likely indicate a problem in the database configuration. 

Main processes should monitored:

module_begin
module_name DB2Sys
module_type generic_proc
module_proc db2syscs.exe
module_description DB2 Primary database engine
module_end

module_begin
module_name DB2Jds
module_type generic_proc
module_proc db2jds.exe
module_description The DB2 JDBC applet server service
module_end


DB2 Performance counters
========================

DB2 makes its performance information available to the Performance Monitor tool. From the tool you can collect information on the DB2 Database Manager, DB2 Databases and DB2 Applications. 

Memory Monitoring
=================

The db2mtrk command is the DB2 tool used to display information on the memory usage of agents and memory pools owned by a DB2 instance. This command is available on both Windows and UNIX-like platforms. Scripts that use this to collect information may provide a historical view of memory activity. UNIX-style scripts could even run on Windows if you use Cygwin. Here is a sample of the output from the db2mtrk command:

$ db2mtrk -i -p -w -d -v
Tracking Memory on: 2002/12/03 at 10:03:26

Memory for instance

   Database Monitor Heap has watermark of 180224 bytes
   Other Memory has watermark of 5226496 bytes
   Total: 5406720 bytes

Memory for database: GDMS0401

   Backup/Restore/Util Heap has watermark of 16384 bytes
   Package Cache has watermark of 327680 bytes
   Catalog Cache Heap has watermark of 81920 bytes
   Buffer Pool Heap has watermark of 4341760 bytes
   Buffer Pool Heap has watermark of 671744 bytes
   Buffer Pool Heap has watermark of 409600 bytes
   Buffer Pool Heap has watermark of 278528 bytes
   Buffer Pool Heap has watermark of 212992 bytes
   Lock Manager Heap has watermark of 458752 bytes
   Database Heap has watermark of 1540096 bytes
   Other Memory has watermark of 0 bytes
   Total: 8339456 bytes

Memory for agent 4157

   Application Heap has watermark of 212992 bytes
   Application Control Heap has watermark of 16384 bytes
   Total: 229376 bytes

For those that prefer a GUI interface, the DB2 Memory Visualizer provides a way to monitor DB2 memory usage over time.

Text taken, from Article written by John Maenpaa
Original URL: http://www.cmg.org/measureit/issues/mit14/m_14_2.html