How To Fix SDBALM086 - Hit rate for the OMS history 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: 086

• Message text: Hit rate for the OMS history 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 SDBALM086 - Hit rate for the OMS history data in the data cache in % ?

  The SAP error message SDBALM086 indicates that the hit rate for the Online Monitoring System (OMS) history 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 efficiency of the data cache used by the database.
  Cause:
  The hit rate for the OMS history data in the data cache is a measure of how often the requested data is found in the cache versus how often it needs to be retrieved from the database. A low hit rate can be caused by several factors, including:
  
  Insufficient Cache Size: The cache may not be large enough to hold frequently accessed data.
  High Data Volume: An increase in the volume of data being processed can lead to cache misses.
  Inefficient Queries: Poorly optimized queries may lead to excessive data retrieval from the database.
  Data Changes: Frequent changes to the data can lead to cache invalidation, resulting in more cache misses.
  Configuration Issues: Incorrect configuration settings for the database or cache parameters.
  
  Solution:
  To address the issue indicated by the SDBALM086 message, consider the following steps:
  
  Increase Cache Size: If the cache size is too small, consider increasing it to accommodate more data.
  Optimize Queries: Review and optimize the SQL queries being executed to ensure they are efficient and make better use of the cache.
  Monitor Data Changes: If data changes frequently, analyze the patterns and consider strategies to minimize cache invalidation.
  Adjust Configuration: Review the database and cache configuration settings to ensure they are optimized for your workload.
  Regular Maintenance: Perform regular database maintenance tasks, such as updating statistics and rebuilding indexes, to improve performance.
  Analyze Workload: Use SAP tools to analyze the workload and identify any bottlenecks or areas for improvement.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like ST02 (Buffer Monitor) and ST04 (Database Performance Monitor) to analyze buffer and database performance.
  SAP Notes: Check SAP Notes related to performance tuning and cache management for specific recommendations and best practices.
  Documentation: Refer to the SAP Help Portal for detailed documentation on database performance and cache management.
  
  By following these steps and monitoring the performance, you can improve the hit rate for the OMS history data in the data cache and resolve the SDBALM086 error message.