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The Control File…
Always the initial repository of RMAN metadata
Control File contains
- Circularly reusable records
- Non-reusable records for datafiles and logs
- Persistent configuration setting records
Circularly reusable records
- Initial allocation of empty records (slots)
- LGWR and ARCH add data
- History of log switches
- Archive log history
- Backup history
Notes:
The control file is actually always used as a repository for RMAN metadata, even if you also use a recovery catalog. It is the only repository of data if you use RMAN in NOCATALOG mode. See the “NOCATALOG Mode” section later in this document.
The control file is made up of records or slots. There are 3 types of records in the control file:
Circularly reusable records – these records can be overwritten after they are older than value specified in control_file_record_keep_time parameter.
Non-Reusable records – these records cannot be overwritten.
Persistent Configuration records – these records contain the RMAN environment settings. They are changed with the CONFIGURE command.
Notes continued on the next page…