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Recovery Catalog Maintenance…
RESYNC CATALOG command updates recovery catalog
- Propagate new and changed information into catalog
- Log history
- New datafiles
Automatic re-syncs when you execute:
- RMAN commands backup, copy, crosscheck, delete, duplicate, list, recover, switch
Notes:
Keeping the recovery catalog updated with the information from the current control file is critical and is easily accomplished with the RESYNC CATALOG RMAN command. If we never updated the recovery catalog with metadata from the control file, and we lost the target database and control file, RMAN would not know, for example, the most recent structure of the database and the that certain archived logs exist and would not be able to fully recover your database.
RMAN performs automatic resynchronizations whenever you issue a backup command (other commands as well).