How to fix the Oracle error ORA-19816: WARNING: Files may exist in string that are not known to database.?

In this post, you’ll learn more about the Oracle ErrorORA-19816: WARNING: Files may exist in string that are not known to database. with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

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

Reason for the Error ORA-19816: WARNING: Files may exist in string that are not known to database.

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.

How to fix the Error ORA-19816: WARNING: Files may exist in string that are not known to database. ?

You can fix this error in Oracle by following the below steps

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 reclamation before backup Do not use messages 19819; it is used to disable clearing file name

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