Monitoring the Memory Management System

Use

You should monitor the SAP system during operation to check that memory management has the necessary resources, and that frequent paging at operating system level does not slow down the system or cause any bottlenecks.

Process

The following tools are suitable for monitoring:

• Tune Summary (transaction ST02)

  The current status and the memory resource usage for a specific SAP application server are displayed here. The procedure is described in Checking Roll /Paging Area and Extended Memory using Transaction ST02.

• Transaction ST06 for monitoring the available swap space in the host system.

  More information: Monitoring Memory Resources Using Transaction ST06.

• CCMS Alert Monitor (transaction RZ20):

  More information: Tutorial in the CCMS documentation

• Overview of Users (transaction SM04):

  Call transaction SM04 or choose Tools   Administration  Monitoring   System Monitoring   User Overview.

  In transaction SM04 you can display various columns for memory values. You can show the possible columns with icon .

• Overview of Work Processes (transaction SM50)

  Select the Detail button to display the memory resources that have been reserved for a certain work process.

  More information: Displaying and Controlling Work Processes.

  By monitoring work processes in the SAP system (transaction SM50) or from outside the system (dpmon program at operating system level), you can determine the status of the work processes in relation to the PRIV mode. If work processes are often switched to the PRIV mode, you must increase the extended memory and/or adjust the limit for the extended memory.

• With the in transaction SM50 you can evaluate this information for all the work processes. Alternatively, you can call this system-wide list with transaction SM66.

• You can determine the Swap Space Requirements at SAP and operating system level.