How To Fix DB02067 - &1 &3 < &2 &3: Cache hit ratio below threshold

SAP Error Message - Details

• Message type: E = Error

• Message class: DB02 - For Oracle Component of the Database Monitor

• Message number: 067

• Message text: &1 &3 < &2 &3: Cache hit ratio below threshold

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB02067 - &1 &3 < &2 &3: Cache hit ratio below threshold ?

  The SAP error message DB02067 indicates that the cache hit ratio for a database is below a specified threshold. This can lead to performance issues, as a low cache hit ratio means that the database is not effectively utilizing its cache, resulting in more frequent disk I/O operations and slower response times.
  Cause:
  
  Insufficient Cache Size: The cache may not be large enough to hold frequently accessed data.
  High Workload: An increase in the number of transactions or queries can lead to cache saturation.
  Inefficient Queries: Poorly optimized SQL queries can lead to excessive cache misses.
  Data Changes: Frequent updates to the data can cause cache entries to be invalidated, leading to more cache misses.
  Configuration Issues: Incorrect database or cache configuration settings can lead to suboptimal cache performance.
  
  Solution:
  
  Increase Cache Size: If possible, increase the size of the database cache to accommodate more data.
  Optimize Queries: Review and optimize SQL queries to ensure they are efficient and make better use of the cache.
  Monitor Workload: Analyze the workload on the database to identify any spikes or patterns that may be affecting cache performance.
  Adjust Configuration: Review and adjust database configuration settings related to caching to ensure they are optimal for your workload.
  Regular Maintenance: Perform regular database maintenance tasks, such as updating statistics and rebuilding indexes, to improve performance.
  Analyze Cache Usage: Use monitoring tools to analyze cache usage patterns and identify areas for improvement.
  
  Related Information:
  
  Monitoring Tools: Use SAP's monitoring tools (like ST04, ST03, or DBACOCKPIT) to analyze database performance and cache statistics.
  Database Documentation: Refer to the documentation for your specific database (e.g., HANA, Oracle, SQL Server) for best practices on cache management and performance tuning.
  SAP Notes: Check SAP Notes for any known issues or patches related to cache performance.
  Performance Tuning: Consider engaging with a database administrator or SAP Basis consultant for in-depth performance tuning and analysis.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the cache hit ratio and overall database performance.