How To Fix SDBALM089 - Hit rate of the rollback cache in %

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 089

• Message text: Hit rate of the rollback 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
after 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 SDBALM089 - Hit rate of the rollback cache in % ?

  The SAP error message SDBALM089 indicates that the hit rate of the rollback cache is below a certain threshold, which can lead to performance issues in the database. This message is part of the database performance monitoring and is related to the rollback cache's efficiency in handling transactions.
  Cause:
  The rollback cache is used to store the undo information for database transactions. A low hit rate means that the database is frequently needing to access the disk to retrieve rollback information rather than finding it in memory. This can occur due to several reasons:
  
  Insufficient Memory Allocation: The rollback cache may not have enough memory allocated to handle the volume of transactions.
  High Transaction Volume: A high number of concurrent transactions can lead to increased demand on the rollback cache.
  Long-Running Transactions: Transactions that take a long time to complete can hold onto rollback information longer, leading to cache pressure.
  Configuration Issues: Incorrect configuration settings for the database or rollback cache can lead to suboptimal performance.
  
  Solution:
  To address the SDBALM089 error, consider the following solutions:
  
  
  Increase Rollback Cache Size: If the rollback cache size is too small, increase it to accommodate the workload. This can often be done through database configuration settings.
  
  
  Optimize Transactions: Review and optimize long-running transactions. Ensure that transactions are as short as possible to reduce the amount of rollback information that needs to be stored.
  
  
  Monitor and Adjust Workload: Analyze the workload on the database. If there are spikes in transaction volume, consider load balancing or scheduling heavy transactions during off-peak hours.
  
  
  Database Configuration: Review the database configuration settings related to the rollback cache. 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 rebuilding indexes, to ensure optimal performance.
  
  
  Consult Documentation: Refer to the specific database documentation for detailed instructions on configuring the rollback cache and understanding performance metrics.
  
  
  Related Information:
  
  Monitoring Tools: Use SAP's monitoring tools (like DBACOCKPIT) to keep an eye on database performance metrics, including rollback cache hit rates.
  Performance Tuning: Engage in performance tuning practices for your database, which may include adjusting memory settings, optimizing queries, and ensuring efficient indexing.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message, as SAP frequently updates its knowledge base with solutions for common problems.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the hit rate of the rollback cache and enhance overall database performance.