How To Fix DB11177 - Wait event 'latch free latch: '

SAP Error Message - Details

• Message type: E = Error

• Message class: DB11 - Oracle Monitor: messages

• Message number: 177

• Message text: Wait event 'latch free latch: '

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB11177 - Wait event 'latch free latch: ' ?

  The SAP error message DB11177, which indicates a wait event for "latch free latch: ", typically arises in Oracle databases when a session is waiting for a latch that is currently held by another session. Latches are lightweight synchronization mechanisms used in Oracle to protect shared data structures in memory. When a session cannot acquire a latch, it will wait, leading to potential performance issues.
  Causes:
  
  High Contention: Multiple sessions are trying to access the same latch simultaneously, leading to contention.
  Inefficient Code: Poorly optimized SQL queries or PL/SQL code can lead to excessive latch contention.
  Configuration Issues: Incorrect database configuration or insufficient resources can exacerbate latch contention.
  Heavy Load: A sudden increase in workload can lead to more sessions competing for the same latches.
  Bug in Oracle: Sometimes, specific versions of Oracle may have bugs that lead to latch contention.
  
  Solutions:
  
  
  Identify the Latch: Use Oracle's performance views (like V$LATCH, V$SESSION, and V$SESSION_WAIT) to identify which latch is causing the contention and which sessions are waiting.
  SELECT * FROM V$LATCH WHERE NAME = '<latch_name>';
  SELECT * FROM V$SESSION_WAIT WHERE EVENT LIKE 'latch free%';
  
  
  Optimize SQL Queries: Review and optimize the SQL queries that are causing high contention. Use execution plans to identify bottlenecks.
  
  
  Increase Resources: If the database is under heavy load, consider increasing the resources (CPU, memory) allocated to the database.
  
  
  Adjust Initialization Parameters: Some initialization parameters can be tuned to reduce latch contention. For example, increasing the size of the shared pool or buffer cache can help.
  
  
  Upgrade Oracle: If the issue is due to a bug in the Oracle version, consider upgrading to a more recent version where the issue is resolved.
  
  
  Monitor and Analyze: Continuously monitor the database performance and analyze the wait events to identify patterns and take proactive measures.
  
  
  Related Information:
  
  Oracle Documentation: Refer to Oracle's documentation for detailed explanations of latches and their management.
  Performance Tuning: Consider using Oracle's Automatic Workload Repository (AWR) reports to analyze performance and identify areas for improvement.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to this error message.
  
  Conclusion:
  Resolving the DB11177 error requires a combination of monitoring, analysis, and optimization. By identifying the root cause of latch contention and applying the appropriate solutions, you can improve the performance of your SAP system running on Oracle.