Guide to Resolving ORA-01113 Error in Oracle Databases

Error Overview

• Error Code: ORA-01113
• Description: File needs media recovery
• Possible Causes: Improper database shutdown, data file corruption, storage issues, etc.

Initial Diagnosis

1. Identify the Affected File: The error message usually specifies which file is problematic.
2. Check Logs: Review database logs for any related error messages.

Standard Recovery Process

1. Attempt Normal Recovery: Execute the RECOVER DATABASE command to see if it resolves the issue.
2. Manually Recover Specific File: If you know which file is affected, try using the RECOVER DATAFILE 'file path' command.

Advanced Recovery Options

• _ALLOW_RESETLOGS_CORRUPTION Parameter: This is a high-risk internal parameter, only to be considered when standard recovery methods fail.
  • Precautions Before Use:
    • Ensure no other recovery options are available.
    • Understand the risks associated with this parameter, including potential data inconsistency and database corruption.
    • Typically recommended to be used under the guidance of Oracle support personnel.
  • How to Use:
    • Set the parameter _ALLOW_RESETLOGS_CORRUPTION=TRUE.
    • Perform the recovery and reset logs operations.
    • Conduct thorough data validation to confirm the database state.

Follow-Up Steps

1. Data Export and Import: If _ALLOW_RESETLOGS_CORRUPTION is used, consider exporting all data and importing it into a new database instance.
2. Backup Update: After successful recovery, immediately perform a comprehensive backup.

Risks and Considerations

• Using the _ALLOW_RESETLOGS_CORRUPTION parameter carries a high risk, potentially leading to data inconsistency and irreparable damage.
• Always try standard recovery methods first.
• In emergency cases, seek assistance from Oracle professional support.

Conclusion

The ORA-01113 error is an indicator that a file requires media recovery. When addressing this error, the preferred method is to use standard Oracle recovery commands. If all other options are unfeasible, the _ALLOW_RESETLOGS_CORRUPTION parameter may be considered, but it is crucial to fully understand its risks and preferably proceed under professional guidance. After resolution, immediate comprehensive backup and data verification are essential to ensure the integrity and consistency of the database.