How To Fix DB11071 - Oracle library cache monitoring

SAP Error Message - Details

• Message type: E = Error

• Message class: DB11 - Oracle Monitor: messages

• Message number: 071

• Message text: Oracle library cache monitoring

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB11071 - Oracle library cache monitoring ?

  The SAP error message DB11071 related to Oracle library cache monitoring typically indicates that there are issues with the library cache in the Oracle database. This can occur when there are performance problems due to insufficient memory allocation, high contention for library cache locks, or inefficient SQL statements that are not being reused effectively.
  Cause:
  
  Library Cache Contention: High contention for library cache locks can occur when multiple sessions are trying to access the same SQL statements or PL/SQL packages simultaneously.
  Insufficient Memory: If the library cache is not adequately sized, it can lead to frequent invalidations and reloads of SQL statements, causing performance degradation.
  Inefficient SQL Statements: Poorly written SQL queries that are not optimized can lead to excessive parsing and execution, consuming more resources.
  Frequent Changes: If there are frequent changes to the SQL statements or PL/SQL packages, it can lead to invalidation of cached statements, causing performance issues.
  
  Solution:
  
  Increase Library Cache Size: Adjust the shared_pool_size parameter in the Oracle database to allocate more memory to the library cache. This can help reduce contention and improve performance.
  
  Example: 
  ALTER SYSTEM SET shared_pool_size = <new_size> SCOPE=BOTH;
  
  
  
  Optimize SQL Statements: Review and optimize SQL queries to ensure they are efficient and make use of indexes. Use tools like Oracle's SQL Tuning Advisor to identify and fix performance issues.
  Monitor and Analyze: Use Oracle's performance monitoring tools (like AWR reports) to analyze library cache usage and identify problematic SQL statements or sessions.
  Reduce Invalidations: Minimize the frequency of changes to SQL statements and PL/SQL packages to reduce the number of invalidations in the library cache.
  Use Bind Variables: Encourage the use of bind variables in SQL statements to improve the reuse of execution plans and reduce parsing overhead.
  
  Related Information:
  
  Oracle Documentation: Refer to Oracle's official documentation for detailed information on managing the library cache and tuning the shared pool.
  SAP Notes: Check SAP Notes related to database performance and tuning for specific recommendations tailored to SAP environments.
  Performance Monitoring Tools: Utilize tools like Oracle Enterprise Manager or third-party monitoring solutions to keep track of library cache performance and contention issues.
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the issues related to the DB11071 error and improve the overall performance of your SAP system running on Oracle.