How to Diagnose and Fix the ORA-01265 Error in Oracle: Installed DLM Does Not Support Releasable Locking Mode

If you have encountered the ORA-01265 error in Oracle, it means that the installed Distributed Lock Manager (DLM) does not support the releasable locking mode. This error can occur for various reasons, and it’s important to diagnose and fix it in order to ensure the smooth operation of your Oracle database.

Here are some steps to diagnose and fix the ORA-01265 error:

Diagnosing the ORA-01265 Error

1. Check the Oracle alert log for any additional error messages related to the ORA-01265 error.
2. Review the database configuration and settings to ensure that the DLM is properly installed and configured.
3. Check for any recent changes or updates to the database that may have triggered the ORA-01265 error.

Fixing the ORA-01265 Error

Once you have diagnosed the ORA-01265 error, you can take the following steps to fix it:

1. Verify DLM Support

First, verify that the installed DLM supports releasable locking mode. You can do this by checking the Oracle documentation or contacting Oracle support for assistance.

2. Update DLM Configuration

If the installed DLM does not support releasable locking mode, you may need to update the DLM configuration or install a different DLM that supports the required locking mode. Consult the Oracle documentation or a qualified Oracle DBA for guidance on updating the DLM configuration.

3. Review Database Locking Mode

Review the database locking mode settings to ensure that they are compatible with the installed DLM. You may need to adjust the database locking mode to align with the capabilities of the DLM.

4. Apply Oracle Patches or Updates

In some cases, the ORA-01265 error may be resolved by applying Oracle patches or updates that address DLM compatibility issues. Check the Oracle support website for any available patches or updates related to the ORA-01265 error.

5. Seek Expert Assistance

If you are unable to resolve the ORA-01265 error on your own, consider seeking assistance from a qualified Oracle DBA or contacting Oracle support for further guidance.

In conclusion, the ORA-01265 error in Oracle can be diagnosed and fixed by verifying DLM support, updating DLM configuration, reviewing database locking mode, applying Oracle patches or updates, and seeking expert assistance if needed. It’s important to carefully review the error message, diagnose the underlying cause, and take appropriate steps to address the issue in order to ensure the continued stability and performance of your Oracle database.

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