How To Fix DB02091 - Rollback segment extension failed. ORA-1562 found in alert_.log.

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 091

• Message text: Rollback segment extension failed. ORA-1562 found in alert_.log.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB02091 - Rollback segment extension failed. ORA-1562 found in alert_.log. ?

  The error message "DB02091 Rollback segment extension failed. ORA-1562" typically indicates an issue related to the rollback segments in an Oracle database, which is often used in conjunction with SAP systems. This error can occur when the database is unable to extend a rollback segment due to various reasons, such as insufficient space in the tablespace or issues with the database configuration.
  Causes:
  
  Insufficient Tablespace: The most common cause is that the tablespace where the rollback segments are stored does not have enough free space to accommodate the extension.
  Max Extents Reached: The rollback segment may have reached its maximum number of extents, which prevents it from being extended further.
  Database Configuration Issues: There may be configuration issues with the database that prevent it from managing rollback segments effectively.
  High Transaction Volume: A high volume of transactions can lead to rapid consumption of rollback segment space, causing extensions to fail.
  
  Solutions:
  
  
  Increase Tablespace Size:
  
  Check the current size of the tablespace where the rollback segments are located.
  If it is low on space, consider adding more space to the tablespace.
  You can do this using the following SQL command:
  ALTER DATABASE DATAFILE 'path_to_datafile' RESIZE new_size;
  
  Or add a new datafile:
  ALTER TABLESPACE tablespace_name ADD DATAFILE 'new_datafile_path' SIZE size_in_MB;
  
  
  
  
  Check and Modify Rollback Segment Settings:
  
  Review the settings for the rollback segments, including the maximum extents.
  You can increase the maximum extents for the rollback segment if necessary:
  ALTER ROLLBACK SEGMENT segment_name STORAGE (INITIAL size NEXT size MAXEXTENTS unlimited);
  
  
  
  
  Monitor and Optimize Transactions:
  
  Analyze the workload and optimize long-running transactions to reduce the pressure on rollback segments.
  Consider breaking large transactions into smaller ones if possible.
  
  
  
  Database Maintenance:
  
  Regularly perform database maintenance tasks such as gathering statistics and checking for fragmentation.
  Ensure that the database is configured correctly for the workload it is handling.
  
  
  
  Consult Oracle Documentation:
  
  Refer to Oracle's documentation for specific guidance on managing rollback segments and troubleshooting related issues.
  
  
  
  Related Information:
  
  Alert Log: The alert log (alert_<SID>.log) contains important information about the database's operation and can provide additional context for the error.
  Oracle Support: If the issue persists, consider reaching out to Oracle Support for assistance, especially if you have a support contract.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to this error, as SAP may have specific configurations or best practices for Oracle databases.
  
  By addressing the underlying causes and implementing the suggested solutions, you should be able to resolve the "DB02091 Rollback segment extension failed. ORA-1562" error in your SAP environment.