Oracle® Database Backup and Recovery Advanced User's Guide 10g Release 2 (10.2) Part Number B14191-02 |
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Use the CONFIGURE
...
BACKUP
COPIES
command to specify how many copies of each backup piece should be created on the specified device type for the specified type of file. This feature is known as duplexing. The CONFIGURE
setting s for duplexing only affect backups of datafiles, control files and archived logs into backup sets, and do not affect image copies.
Note:
Control file autobackups on disk are a special case and are never duplexed: RMAN always creates one and only one copy.To configure the number of backup set copies, specify an integer. The following examples show possible configurations:
# Makes 2 disk copies of each datafile and control file backup set # (autobackups excluded) CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2; # Makes 3 copies of every archived redo log backup to tape CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE sbt TO 3;
If you use the duplexing feature in conjunction with multiple FORMAT
strings, then you can name each individual backup set copy. For example, assume that you configure BACKUP
COPIES
to 3
. Then, you can issue:
BACKUP DATABASE FORMAT '/tmp/%U', '?/dbs/%U', '?/oradata/%U';
RMAN generates 3 identical copies of each backup piece in the backup set, and names each piece according to the specified FORMAT
string: the first copy is placed in the /tmp
directory, the second in the ?/dbs
directory, and the third in the ?/oradata
directory. Note that you can specify the FORMAT
string on the BACKUP
, CONFIGURE
CHANNEL
, and ALLOCATE
CHANNEL
commands.
To return a BACKUP
COPIES
configuration to its default value, run the same CONFIGURE
command with the CLEAR
option, as in this example:
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE sbt CLEAR;
By default, CONFIGURE
...
BACKUP
COPIES
is set to 1
for each device type.
Note:
If you do not want to create a persistent copies configuration, then you can specify copies with theBACKUP
COPIES
and SET
BACKUP
COPIES
commands.See Also:
"Manual Parallelization of Backups" for concepts
Oracle Database Backup and Recovery Reference for BACKUP
syntax
Oracle Database Backup and Recovery Reference for CONFIGURE
syntax
Oracle Database Backup and Recovery Reference for SET
syntax
SHOW... BACKUP COPIES
lets you view how you have used CONFIGURE
...
BACKUP
COPIES
command to set the number of identical copies that RMAN makes of each of several types of backup.
After connecting to the target database and recovery catalog (if you use one), run the SHOW
ARCHIVELOG
BACKUP
COPIES
or SHOW
DATAFILE
BACKUP
COPIES
commands. For example, enter:
SHOW DATAFILE BACKUP COPIES; # shows CONFIGURE DATAFILE BACKUP COPIES setting
Sample output for SHOW
DATAFILE
BACKUP
COPIES
follows:
RMAN configuration parameters are: CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE SBT_TAPE TO 1; # default CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default