How To Fix DB11179 - Wait event 'enqueue enq:-'

SAP Error Message - Details

• Message type: E = Error

• Message class: DB11 - Oracle Monitor: messages

• Message number: 179

• Message text: Wait event 'enqueue enq:-'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB11179 - Wait event 'enqueue enq:-' ?

  The SAP error message DB11179, which indicates a wait event related to "enqueue enq:-", typically arises in the context of database locking mechanisms. This error suggests that a process is waiting for a lock that is held by another process, which can lead to performance issues or deadlocks if not addressed.
  Cause:
  
  Lock Contention: Multiple processes are trying to access the same resource (e.g., a database table or row) simultaneously, leading to contention for locks.
  Long-Running Transactions: A transaction that holds a lock for an extended period can block other transactions from acquiring the necessary locks.
  Deadlocks: Two or more processes are waiting for each other to release locks, creating a deadlock situation.
  Inefficient Queries: Poorly optimized queries can take longer to execute, holding locks longer than necessary.
  
  Solution:
  
  Identify Blocking Sessions: Use database monitoring tools or SQL queries to identify which sessions are holding locks and which are waiting for them. In Oracle, for example, you can use the V$SESSION and V$LOCK views.
  Optimize Transactions: Review and optimize long-running transactions to ensure they complete as quickly as possible. This may involve breaking large transactions into smaller ones or optimizing the SQL queries involved.
  Increase Lock Timeout: If appropriate, consider increasing the lock timeout settings to allow processes to wait longer for locks before timing out.
  Implement Proper Indexing: Ensure that the database tables involved are properly indexed to speed up query execution and reduce lock duration.
  Review Application Logic: Check the application logic to ensure that locks are acquired and released in a timely manner. Avoid holding locks longer than necessary.
  Deadlock Resolution: If deadlocks are occurring, consider implementing deadlock detection and resolution strategies. Most databases have built-in mechanisms to handle deadlocks, but application logic should also be reviewed to minimize their occurrence.
  
  Related Information:
  
  Database Monitoring Tools: Use tools like SAP Solution Manager, Oracle Enterprise Manager, or SQL Server Management Studio to monitor database performance and lock contention.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to this error message.
  Performance Tuning: Regularly perform database performance tuning and maintenance to ensure optimal performance and reduce the likelihood of lock contention.
  Documentation: Refer to the official SAP documentation and database documentation for best practices on managing locks and transactions.
  
  By addressing the underlying causes of the lock contention and optimizing the database and application logic, you can mitigate the impact of the DB11179 error and improve overall system performance.