When do we need to change database identifier (DBID)?

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Never. In all my years as an Oracle DBA, I have never once had to change the DBID. The only reason I can think of to change the DBID has to do with RMAN and a Recovery Catalog. But even then, I'd just blow away that DBID in the Recovery Catalog and reregister the db with the RC and take a good backup.

This was first published in February 2008

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