Potential of “import catalog” command

Originally posted on “Databases at CERN” blog

Since version 11.1 of Oracle database, there is very useful command available, allowing DBAs to easily move RMAN recovery catalog schemas between databases. Its functionality is even broader, as it also allows one catalog schema to be merged into another – either the whole schema or just the metadata of chosen databases. Command I’m writing about is of course IMPORT CATALOG, which I had a chance to use recently, to move our recovery catalog to the new database. It was moved from Oracle 11.2.0.3 database to 11.2.0.4, with recovery catalog schema using below version:

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Datafile without backups – how to restore?

Originally posted on “Databases at CERN” blog

Have you ever had a problem with restoring datafiles without any backups available? It’s easy, of course if you have all archived logs from the time datafile was created. Please check it here: Re-Creating Data Files When Backups Are Unavailable. Moreover, RMAN is clever enough to create empty datafile automatically during restore phase and then recover it using archived logs. So far, so good, but…

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