How To Fix DB02071 - Oracle library cache monitoring

SAP Error Message - Details

• Message type: E = Error

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

• 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 DB02071 - Oracle library cache monitoring ?

  The SAP error message DB02071 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 too small, it may not be able to hold all the necessary SQL statements, leading to frequent parsing and re-parsing of SQL.
  Inefficient SQL Statements: Poorly written SQL queries that are not optimized can lead to excessive parsing and can fill up the library cache quickly.
  Frequent Changes to SQL: If applications are frequently changing SQL statements, it can lead to a high churn rate in the library cache.
  
  Solution:
  
  Increase Library Cache Size: Adjust the shared_pool_size parameter in the Oracle database to increase the size of the shared pool, which includes the library cache. This can help accommodate more SQL statements and reduce contention.
  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 bind variables where possible. This can help reduce the number of unique SQL statements in the library cache.
  Monitor and Tune: Use Oracle's performance monitoring tools (like AWR reports) to identify SQL statements that are causing contention and tune them accordingly.
  Use Bind Variables: Encourage the use of bind variables in applications to reduce the number of unique SQL statements and improve cache hit ratios.
  Check for Invalid Objects: Ensure that there are no invalid objects in the database that could be causing issues with SQL execution.
  
  Related Information:
  
  Oracle Documentation: Refer to Oracle's documentation on tuning the shared pool and library cache for more detailed guidance.
  SAP Notes: Check SAP Notes related to database performance and tuning for specific recommendations tailored to SAP environments.
  Monitoring Tools: Utilize Oracle Enterprise Manager or other monitoring tools to keep an eye on library cache usage and contention.
  
  Conclusion:
  Addressing the DB02071 error involves a combination of increasing memory allocation, optimizing SQL, and monitoring performance. Regular maintenance and tuning can help prevent this error from occurring in the future.