How To Fix SDBALM188 - Low hit rate in the catalog cache (&1&3 < &2&3)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 188

• Message text: Low hit rate in the catalog 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 SDBALM188 - Low hit rate in the catalog cache (&1&3 < &2&3) ?

  The SAP error message SDBALM188 indicates that there is a low hit rate in the catalog cache, which can affect the performance of database operations. This message typically appears when the hit rate in the catalog cache falls below a certain threshold, suggesting that the system is frequently accessing the database rather than retrieving data from the cache.
  Cause:
  
  Low Cache Hit Rate: The primary cause of this error is that the catalog cache is not effectively storing frequently accessed data, leading to a high number of cache misses.
  Insufficient Cache Size: The cache may be too small to hold the necessary data, resulting in frequent evictions of cached entries.
  High Data Volume: If the volume of data being processed is high, it may exceed the capacity of the cache.
  Inefficient Queries: Poorly optimized queries can lead to excessive database access, which can further reduce the cache hit rate.
  Database Configuration: Incorrect database configuration settings can also contribute to low cache performance.
  
  Solution:
  
  Increase Cache Size: Consider increasing the size of the catalog cache to accommodate more entries. This can be done through database configuration settings.
  Optimize Queries: Review and optimize the SQL queries being executed to ensure they are efficient and make better use of the cache.
  Monitor Cache Usage: Use monitoring tools to analyze cache usage patterns and identify which queries are causing cache misses.
  Database Statistics: Ensure that database statistics are up to date, as outdated statistics can lead to inefficient query plans.
  Adjust Configuration Parameters: Review and adjust relevant database configuration parameters that control caching behavior.
  Regular Maintenance: Perform regular database maintenance tasks, such as re-indexing and updating statistics, to improve overall performance.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like ST02 (Tune Summary) and ST04 (Database Performance Analysis) to monitor and analyze the performance of the database and cache.
  SAP Notes: Check for relevant SAP Notes that may provide additional insights or specific fixes related to this error message.
  Performance Tuning: Consider engaging in performance tuning activities, which may include analyzing workload patterns and adjusting system resources accordingly.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the cache hit rate and overall database performance in your SAP environment.