How To Fix SDBALM087 - Hit rate for the OMS rollback data in the data cache in %

SAP Error Message - Details

• Message type: E = Error

• Message class: SDBALM - SAP DB and liveCache Alert Monitoring

• Message number: 087

• Message text: Hit rate for the OMS rollback data in the data cache in %

Description
The system calculates and displays the hitrate since the last run of
the data collector. In the case of the first run of the data collector
since a restart of the instance or after the Alert Monitor is started,
the system does not display a hitrate.
Data Collector
<ZH>Collector B</>
(RZ20 -> SAP CCMS Technical Experts Monitors -> All Monitoring Contexts
,,-> <Name of the database connection> -> Collectors and Internals
-> Collectors -> Collector B)

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Preset runtime interval of Collector B: 15 minutes

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SDBALM087 - Hit rate for the OMS rollback data in the data cache in % ?

  The SAP error message SDBALM087 indicates that the hit rate for the Online Transaction Processing (OLTP) Message Server (OMS) rollback data in the data cache is below an acceptable threshold. This message is part of the SAP database performance monitoring and is related to the management of rollback segments in the database.
  Cause:
  The hit rate for the OMS rollback data can drop for several reasons, including:
  
  High Transaction Volume: A large number of transactions can lead to increased rollback data, which may not be efficiently cached.
  Insufficient Memory Allocation: If the memory allocated for the data cache is insufficient, it can lead to a lower hit rate as the system may need to frequently access the disk instead of the cache.
  Inefficient SQL Queries: Poorly optimized SQL queries can lead to excessive rollback data generation.
  Database Configuration Issues: Incorrect database configuration settings can affect how rollback data is managed and cached.
  Frequent Rollbacks: If transactions are frequently rolled back, it can lead to a higher volume of rollback data.
  
  Solution:
  To address the SDBALM087 error, consider the following solutions:
  
  Increase Cache Size: Review and increase the size of the data cache if it is found to be insufficient. This can help improve the hit rate.
  Optimize SQL Queries: Analyze and optimize SQL queries to reduce the amount of rollback data generated. Use tools like the SQL Trace (ST05) or the SQL Performance Tuning Worklist (ST03N) to identify problematic queries.
  Monitor Transaction Volume: Keep an eye on the transaction volume and assess if there are any spikes that could be causing the issue. If necessary, consider load balancing or optimizing transaction processing.
  Database Configuration: Review the database configuration settings related to rollback segments and caching. Ensure they are set according to best practices for your specific database system.
  Regular Maintenance: Perform regular database maintenance tasks, such as updating statistics and reorganizing tables, to ensure optimal performance.
  
  Related Information:
  
  Transaction Management: Understanding how transactions are managed in SAP and the role of rollback segments can provide insights into improving performance.
  SAP Notes: Check SAP Notes related to performance issues and rollback data management for specific recommendations and patches.
  Monitoring Tools: Utilize SAP monitoring tools like the Database Performance Monitor (DBACOCKPIT) to keep track of database performance metrics, including cache hit rates.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the hit rate for the OMS rollback data and enhance overall database performance.