How To Fix SDBALM085 - Hit rate for the history/undo 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: 085

• Message text: Hit rate for the history/undo 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
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 SDBALM085 - Hit rate for the history/undo data in the data cache (in %) ?

  The SAP error message SDBALM085 indicates that there is a concern regarding the hit rate for the history/undo data in the data cache. This message is typically related to the performance of the database and the efficiency of the data cache in handling requests.
  Cause:
  The hit rate for the history/undo data in the data cache is a performance metric that indicates how often the system is able to retrieve data from the cache rather than having to access the database directly. A low hit rate can be caused by several factors, including:
  
  Insufficient Cache Size: The data cache may not be large enough to hold all the necessary data, leading to frequent cache misses.
  High Volume of Transactions: A high number of transactions can lead to rapid turnover of cached data, resulting in a lower hit rate.
  Inefficient Data Access Patterns: If the application accesses data in a way that does not align well with how the cache is structured, it can lead to poor hit rates.
  Configuration Issues: Incorrect configuration settings for the database or cache can also lead to suboptimal performance.
  
  Solution:
  To address the SDBALM085 error, consider the following solutions:
  
  Increase Cache Size: If the cache size is too small, consider increasing it to accommodate more data. This can help improve the hit rate.
  Monitor and Analyze Usage: Use monitoring tools to analyze the usage patterns of the cache. Identify which data is frequently accessed and optimize the caching strategy accordingly.
  Optimize Database Configuration: Review and optimize the database configuration settings related to caching. Ensure that they are set according to best practices for your specific workload.
  Review Application Logic: If possible, review the application logic to ensure that it is accessing data in a way that maximizes cache efficiency.
  Regular Maintenance: Perform regular maintenance on the database to ensure that it is running optimally. This includes tasks like updating statistics, rebuilding indexes, and purging old data.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like ST02 (Buffer Monitor) and ST04 (Database Performance Monitor) to monitor cache performance and identify issues.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to this error message.
  Performance Tuning: Consider engaging in performance tuning exercises, which may involve analyzing SQL queries, optimizing indexes, and adjusting database parameters.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the hit rate for the history/undo data in the data cache and resolve the SDBALM085 error.