Detailed approach when the used Live cache data area crosses the threshold

Question

Hi,
Could any of you please let me know the detailed approach when the used Live cache data area crosses the threshold in APO system?
The approach I have as of now is :
1) When it is identified that data cache usage is nearly 100%, check for hit rate for OMS data in data cache in LC10 .Because generally hit rate for OMS data in data cache should be atleaset 99.8% and Data Cache usage should be well below 100%.
2) To monitor unsuccessful accesses to data cache choose refresh and compare value now and before unsuccessful accesses result in physical disk I/O and should generally be avoided.
3) The number of OMS data pages (OMS Data) should be much higher than the number of OMS history pages (History/Undo).A ratio of 4:1 is desirable. If OMS history has nearly the same size as OMS data, use Problem AnalysisPerformanceOMS versions to find out if named consistent views (Versions) are open for a long time. Maximum age should be 8hrs.
4)If consumption of OMS heap and data cache is large, one reason may be a long running transaction simulation that accumulates heap memory and prevents the garbage collector from releasing old object images.
5) To display existing transactional simulations in LC10,use Problem AnalysisPerformanceOMS versions and SM04 to find out user of corresponding transaction and may be required to cancel the session after contacting user if the version open for long time..
Please help me by providing additional information on the issue.
Thanks,
Varada Reddy.

Answer 1

Hi Mayank, sorry, one basic question - are you using some selection criteria during extraction? If yes, then try extraction without the selection criteria.
If you maintain selection based on, let's say, material, you need to use the right number of zeros as prefix (based on how you have defined the characteristic for material) otherwise no records would be selected.
Is this relevant in your case?
One more option is to try to repair teh datasource. In the planning area, go to extraction tools, select the datasource, and then choose the option of repair datasource.
If you need more info, pls let me know.
- Pawan