The files are decompressed
automatically during a restore or recovery operation.
RMAN> configure device type disk backup type to compressed backupset;
new RMAN configuration parameters:
CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO
COMPRESSED BACKUPSET PARALLELISM 1;
new RMAN configuration parameters are successfully stored
RMAN>
Compressing backupsets may not be necessary if the operating system??™s file system has
compression enabled or if the tape device hardware automatically compresses backups; however,
RMAN??™s compression algorithm is tuned to efficiently back up Oracle data blocks, and as a result
it may do a better job of compressing the backupsets.
Initialization Parameters
A number of initialization parameters are used to control RMAN backups. We??™ll cover some of
the more important parameters in this section.
CONTROL_FILE_RECORD_KEEP_TIME
A record of all RMAN backups is kept in the target control file. This parameter specifies the number
of days that RMAN will attempt to keep a record of backups in the target control file. After this
time, RMAN will begin to reuse records older than this retention period. If RMAN needs to write
a new backup record, and the retention period has not been reached, RMAN will attempt to
expand the size of the control file. Usually, this is successful because the size of the control file
is relatively small compared to other database objects. However, if space is not available for the
expansion of the control file, RMAN will reuse the oldest record in the control file and write a
message to the alert log.
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