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 OMS cache hitrate <percentage>%, <number> of <number of> accesses failed


This message can occur for SAP liveCache technology only.

The hit rate when accessing the OMS data in the data cache is too low. In a running SAP liveCache application, the hit rate should not fall below 100%, otherwise the data must be read physically.

The hit rate may fall for short periods of time, for example, when objects are accessed for the first time.

User Response

 Check the following points:

  • The data cache load
  • The size of the plan version
  • Long-running OMS versions
  • Configuration of the SAP liveCache and the hardware

More Information

Relevant  DB-Analyzer Files
Helpful with ...
DBAN_CACHE_OCCUPANCY.csvCache load and occupancy (proportion of OMS, SQL, and history pages in the data cache)
DBAN_OMS.csv Number of calls by DB procedures, dereferences, deleted objects, history accesses
DBAN_OMS_CONTAINER.csv  Information on class containers (such as number of classes, occupancy, number of free pages)
DBAN_OMS_HEAP.csv Information on the OMS heap (such as occupancy, current size, collisions)
SAP Note
Helpful with ...
Expert Sessions (Link to trainings)
Content / Helpful with ...
Documentation (links)
Helpful with ...
Concepts of the Database System
Working Memory Areas
Database Administration in CCMS 
Monitoring OMS Versions
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