How To Fix DB11067 - &1 &3 < &2 &3: cache hit ratio below threshold

SAP Error Message - Details

• Message type: E = Error

• Message class: DB11 - Oracle Monitor: messages

• 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 DB11067 - &1 &3 < &2 &3: cache hit ratio below threshold ?

  The SAP error message DB11067 indicates that the cache hit ratio for the 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.
  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 being filled quickly, causing a drop in the hit ratio.
  Inefficient Queries: Poorly optimized SQL queries can lead to excessive cache misses.
  Database Configuration: Incorrect database configuration settings can affect how the cache is utilized.
  Data Changes: Frequent changes to the data can lead to cache invalidation, reducing the hit ratio.
  
  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 causing the issue.
  Database Configuration: Review and adjust database configuration settings related to caching to ensure optimal performance.
  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 and identify which objects are frequently accessed and which are not.
  
  Related Information:
  
  Monitoring Tools: Use SAP transaction codes like ST02 (Tune Summary) and ST04 (Database Performance Monitor) to monitor cache performance and hit ratios.
  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 for your specific SAP version and database.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the cache hit ratio and overall database performance.