Start of Content Area

Procedure documentation Monitoring OMS Versions  Locate the document in its SAP Library structure

Pay attention to the following aspects when you monitor OMS versions:

·        Age of an OMS Version

OMS versions can be processed for several hours and therefore use up increasingly more main memory in the OMS heap.
If OMS versions are open for a very long time, the liveCache database instance has to hold a lot of history data (links to Undo Log Entries) which increasingly fills up the data cache. In some circumstances, data is even written from the data cache to the data area. The increase in I/O has a negative effect on liveCache performance.
Therefore, do not keep OMS versions open for longer than eight hours.

·        Name of the OMS heap

If OMS versions are swapped from the OMS heap, then this data is no longer accessed from the OMS heap but from the data cache. This type of access is significantly bad for performance and should be avoided if possible.

Procedure

Use the OMS Versions display in the liveCache Assistant. You can check the ratio of history data to OMS data in the data cache in the Caches display.

Use the Monitor display in the liveCache Alert Monitor.

Critical Situations

·        An OMS version is older than eight hours.
The application must close this OMS version.
- Schedule the report /SAPAPO/OM_REORG_DAILY once a day in the APO system. All OMS versions older than eight hours are deleted.
- Schedule the report /SAPAPO/OM_DELETE_OLD_SIMSESS every 30 minutes.

·        Some pages of the OMS versions are displaced from the OMS heap (displaced pages).
- The application must work with less data within an OMS version.
- You can reduce the size of the data cache ( general database parameter CACHE_SIZE) and increase the OMS heap ( liveCache parameter OMS_HEAP_LIMIT) instead.
- You can make more main memory available to increase the size of the OMS heap (parameter OMS_HEAP_LIMIT).

·        The amount of history data (link to Undo Log Entries) has risen significantly compared with the OMS data.
Check whether old OMS versions exist.
Check whether the reports /SAPAPO/OM_REORG_DAILY and /SAPAPO/OM_DELETE_OLD_SIMSESS have run.

 

End of Content Area