How To Fix SDBALM183 - Low hit rate for OMS data 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: 183

• Message text: Low hit rate for OMS data 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 SDBALM183 - Low hit rate for OMS data in the data cache (&1&3 < &2&3) ?

  The SAP error message SDBALM183 indicates that there is a low hit rate for the Online Monitoring System (OMS) data in the data cache. This typically means that the system is not efficiently retrieving data from the cache, leading to performance issues. The message provides specific values for the hit rate, which can help diagnose the problem.
  Cause:
  
  Cache Configuration: The cache may not be properly configured, leading to a low hit rate. This can happen if the cache size is too small or if the data being cached is not relevant to the queries being executed.
  Data Volatility: If the data being monitored changes frequently, it may not be retained in the cache long enough to be reused, resulting in a low hit rate.
  Inefficient Queries: Queries that do not leverage the cache effectively can lead to a low hit rate. This can occur if the queries are not optimized or if they are accessing data that is not cached.
  System Load: High system load or resource contention can affect the performance of the cache, leading to lower hit rates.
  
  Solution:
  
  Increase Cache Size: If the cache size is too small, consider increasing it to accommodate more data. This can help improve the hit rate.
  Optimize Queries: Review and optimize the queries being executed to ensure they are making effective use of the cache. This may involve rewriting queries or adjusting how data is accessed.
  Monitor Data Volatility: If the data changes frequently, consider strategies to manage this volatility, such as adjusting the caching strategy or using different caching mechanisms.
  Check System Performance: Monitor the overall performance of the system to identify any bottlenecks or resource contention that may be affecting the cache performance.
  Adjust Cache Parameters: Review and adjust the parameters related to the cache configuration in the SAP system settings. This may include settings for cache expiration, refresh rates, and other related parameters.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like ST02 (Buffer Monitor) and ST04 (Database Performance Monitor) to analyze performance issues related to caching and database access.
  SAP Notes: Check SAP Notes related to caching and performance issues for specific recommendations and patches that may address known issues.
  Performance Tuning: Consider engaging in performance tuning activities, which may include analyzing workload, adjusting database settings, and optimizing application code.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the hit rate for OMS data in the data cache and enhance overall system performance.