How To Fix SDBALM182 - Low hit rate in the data cache (&1&3 < &2&3)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 182

• Message text: Low hit rate in the data 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 SDBALM182 - Low hit rate in the data cache (&1&3 < &2&3) ?

  The SAP error message SDBALM182 indicates that the hit rate in the data cache is low, which can affect the performance of your SAP system. The message typically provides specific values for the current hit rate and the expected hit rate, which can help diagnose the issue.
  Cause:
  
  Low Hit Rate: The hit rate in the data cache is lower than expected, meaning that a significant number of requests are not being served from the cache and are instead requiring access to the database.
  Cache Size: The data cache may be too small to hold the frequently accessed data, leading to more cache misses.
  Data Access Patterns: Changes in data access patterns or an increase in the volume of data can lead to a lower hit rate.
  Configuration Issues: Incorrect configuration settings for the data cache can also contribute to this issue.
  Database Performance: If the underlying database is slow or experiencing issues, it can affect the overall performance and lead to a lower hit rate.
  
  Solution:
  
  Increase Cache Size: Consider increasing the size of the data cache to accommodate more data. This can be done through the SAP profile parameters (e.g., abap/heap_area_total).
  Analyze Access Patterns: Use transaction codes like ST02 (Tune Summary) to analyze the data access patterns and identify which tables or data are causing the low hit rate.
  Adjust Configuration: Review and adjust the configuration settings related to the data cache. Ensure that they are optimized for your specific workload.
  Database Optimization: Check the performance of the underlying database. Ensure that it is properly tuned and that there are no performance bottlenecks.
  Regular Monitoring: Implement regular monitoring of cache performance and hit rates to proactively address any issues before they impact system performance.
  
  Related Information:
  
  Transaction Codes: 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 data cache performance and tuning for specific recommendations and best practices.
  Performance Tuning: Consider engaging with SAP Basis consultants for performance tuning and optimization if the issue persists.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the hit rate in the data cache and enhance the overall performance of your SAP system.