How To Fix SDBALM189 - Low hit rate in the rollback cache (&1&3 < &2&3)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 189

• Message text: Low hit rate in the rollback cache (&1&3 < &2&3)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDBALM189 - Low hit rate in the rollback cache (&1&3 < &2&3) ?

  The SAP error message SDBALM189 indicates that there is a low hit rate in the rollback cache, which can affect the performance of your SAP system. This message typically appears when the number of successful accesses to the rollback cache is significantly lower than the total number of accesses, suggesting that the cache is not being utilized effectively.
  Cause:
  
  Insufficient Cache Size: The rollback cache may be too small to hold the necessary data, leading to frequent cache misses.
  High Transaction Volume: A high volume of transactions can lead to rapid turnover in the cache, resulting in a low hit rate.
  Inefficient Data Access Patterns: If the application is not accessing the data in a way that takes advantage of the cache, it can lead to low hit rates.
  Configuration Issues: Incorrect configuration settings for the rollback cache can also contribute to this issue.
  
  Solution:
  
  
  Increase Cache Size: Consider increasing the size of the rollback cache. This can be done by adjusting the relevant parameters in the SAP system configuration.
  
  You can check and modify the parameters in transaction RZ10 or RZ11.
  Look for parameters like rdisp/rollback_cache_size and adjust them according to your system's needs.
  
  
  
  Monitor and Analyze Transactions: Use transaction ST02 (Tune Summary) to monitor the performance of the rollback cache and analyze the hit rate. This can help identify specific transactions that are causing issues.
  
  
  Optimize Application Logic: Review the application logic to ensure that it is designed to make efficient use of the rollback cache. This may involve optimizing database access patterns or reducing the number of transactions that require rollback.
  
  
  Regular Maintenance: Perform regular maintenance and monitoring of the database and application to ensure that performance remains optimal.
  
  
  Consult SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or patches related to this issue.
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  ST02: Tune Summary for monitoring buffer performance.
  RZ10/RZ11: For changing instance profile parameters.
  
  
  
  SAP Documentation: Refer to the official SAP documentation for detailed information on rollback cache and performance tuning.
  
  
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools to gain insights into system performance and identify bottlenecks.
  
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the hit rate in the rollback cache and enhance the overall performance of your SAP system.