ORA-19816: WARNING: Files may exist in string that are not known to database

Cause: One of the following events caused this:

1. A database crash happened during file creation

2. A backup control file was restored

3. The control file was re-created

4. DB_RECOVERY_FILE_DEST has previously been enabled and then disabled

Action: Use RMAN command CATALOG RECOVERY AREA to re-catalog any such files. If the file header is corrupted, then delete those files using an OS utility. Do not use messages 19817; it is used for simulating lock failure Do not use messages 19818; it is used for space reclaimation before backup

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