How To Fix DB02102 - Redo log not mirrored

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 102

• Message text: Redo log not mirrored

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB02102 - Redo log not mirrored ?

  The SAP error message DB02102, which indicates "Redo log not mirrored," typically arises in the context of database management, particularly with SAP systems that use databases like Oracle, DB2, or others. This error suggests that the redo log files, which are crucial for database recovery and integrity, are not being mirrored as expected. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Configuration Issues: The database may not be configured to mirror redo logs. This can happen if the database was set up without mirroring or if the mirroring configuration was altered.
  Disk Space Issues: If the disk where the redo logs are stored is full or has insufficient space, the mirroring process may fail.
  File System Issues: Problems with the file system or permissions can prevent the database from writing to the mirrored location.
  Database Instance Issues: If the database instance is not running properly or if there are connectivity issues, mirroring may not function as intended.
  Hardware Failures: Issues with the underlying hardware, such as disk failures, can also lead to this error.
  
  Solutions:
  
  Check Configuration: Verify the database configuration settings to ensure that redo log mirroring is enabled. This may involve checking the database parameters or settings in the database management system.
  Disk Space Management: Ensure that there is sufficient disk space available on both the primary and mirrored locations. Clear up space if necessary.
  File System Permissions: Check the permissions on the directories where the redo logs are stored. Ensure that the database user has the necessary permissions to write to these locations.
  Database Health Check: Perform a health check on the database instance to ensure it is running correctly. Restart the instance if necessary.
  Review Logs: Check the database logs for any additional error messages or warnings that could provide more context about the issue.
  Consult Documentation: Refer to the specific database documentation for instructions on how to configure and troubleshoot redo log mirroring.
  Contact Support: If the issue persists, consider reaching out to SAP support or your database vendor for further assistance.
  
  Related Information:
  
  Database Documentation: Each database system (e.g., Oracle, DB2) has its own documentation regarding redo logs and mirroring. Familiarize yourself with these resources.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Backup and Recovery: Understand the implications of redo log mirroring on your backup and recovery strategy, as it plays a critical role in ensuring data integrity and availability.
  
  By addressing the underlying causes and following the suggested solutions, you should be able to resolve the DB02102 error and restore proper functionality to your SAP system.