Oracle Archiver Error: ORA-00257 - How to Fix

The error message 'ORA-00257: archiver error. Connect internal only, until freed.' indicates an issue with the Oracle database archiver. This process manages archived redo logs, crucial for database recovery and backup. The error suggests the archiver can't archive redo logs, possibly due to insufficient disk space or archiving problems.

To resolve this, consider these steps:

1. Check disk space: Verify available space on the server hosting the Oracle database. If full, free up space to enable proper archiver function.

2. Force archiver processing: Connect to the database as a privileged user (e.g., 'sys') and execute the command:

   ALTER SYSTEM ARCHIVE LOG CURRENT;

   This forces the archiver to process pending redo logs.

3. Delete archived logs (caution!): If the archiver still fails, you can manually delete archived logs to free up space. Connect as a privileged user and execute:

   RMAN> DELETE ARCHIVELOG ALL;

   This removes all archived redo logs. Exercise caution, as this prevents database recovery to a point before deletion.

4. Restart the database: After freeing up space, restart the database to see if the archiver resumes working.

If the issue persists, contact your database administrator or Oracle support for further assistance.