How To Fix DB11172 - Wait event 'log file sync'

SAP Error Message - Details

• Message type: E = Error

• Message class: DB11 - Oracle Monitor: messages

• Message number: 172

• Message text: Wait event 'log file sync'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB11172 - Wait event 'log file sync' ?

  The SAP error message DB11172, which indicates a wait event for 'log file sync', typically arises in the context of Oracle databases. This wait event occurs when a session is waiting for the redo log buffer to be written to the redo log files on disk. It is an important aspect of database performance, as it can indicate that the database is experiencing delays in writing changes to disk, which can affect overall system performance.
  Causes of DB11172 'log file sync' Wait Event
  
  
  High Transaction Volume: A high number of transactions can lead to increased contention for the redo log files, causing delays in writing.
  
  
  Slow Disk I/O: If the disks where the redo logs are stored are slow or experiencing high latency, this can lead to longer wait times.
  
  
  Insufficient Redo Log Groups: If there are not enough redo log groups or members, the database may have to wait for a log switch to complete.
  
  
  Improper Configuration: Configuration issues, such as inappropriate sizing of the redo log buffer or log files, can lead to performance bottlenecks.
  
  
  Long-running Queries: Long-running queries or transactions can hold onto resources longer than necessary, causing other transactions to wait.
  
  
  Solutions to Address DB11172
  
  
  Optimize Disk I/O:
  
  Ensure that the disks used for the redo logs are fast and have low latency. Consider using SSDs or RAID configurations that enhance performance.
  
  
  
  Increase Redo Log Size:
  
  Increase the size of the redo log files to accommodate larger transactions and reduce the frequency of log switches.
  
  
  
  Add More Redo Log Groups:
  
  Adding additional redo log groups can help distribute the load and reduce contention.
  
  
  
  Tune Redo Log Buffer:
  
  Increase the size of the redo log buffer in the database configuration to allow more data to be held in memory before being written to disk.
  
  
  
  Monitor and Optimize Queries:
  
  Analyze long-running queries and optimize them to reduce the time they hold onto resources.
  
  
  
  Review Application Logic:
  
  Ensure that the application logic is efficient and does not hold transactions open longer than necessary.
  
  
  
  Database Configuration:
  
  Review and adjust database parameters related to redo log management, such as LOG_BUFFER, LOG_CHECKPOINT_INTERVAL, and LOG_CHECKPOINT_TIMEOUT.
  
  
  
  Related Information
  
  Monitoring Tools: Use Oracle's Automatic Workload Repository (AWR) reports or SQL Trace to identify sessions that are experiencing high wait times for 'log file sync'.
  Performance Tuning: Regularly monitor database performance and tune configurations as necessary to ensure optimal performance.
  Documentation: Refer to Oracle's documentation for detailed information on managing redo logs and performance tuning.
  
  By addressing the underlying causes of the 'log file sync' wait event, you can improve the performance of your SAP system running on an Oracle database.