|Oracle® Database Recovery Manager Reference
10g Release 1 (10.1)
Part Number B10770-01
To manually allocate a channel in preparation for issuing a
CROSSCHECK command. Note that if you use
CONFIGURE to set up automatic channels, then RMAN can use these automatic channels for maintenance operations; you do not have to manually allocate them.
If RMAN allocates the automatic maintenance channel for you, then it uses the same naming convention as any other automatically allocated channel. If you explicitly invoke
MAINTENANCE, then RMAN uses the following convention for channel naming:
devicetype refers to
n refers to the channel number. For example, RMAN uses these names for two manually allocated disk channels:
You can allocate multiple maintenance channels for a single job, but you should only use this feature in these scenarios:
Oracle Database Backup and Recovery Advanced User's Guide to learn how to crosscheck and delete on multiple channels
ORA_to a channel name. RMAN reserves channel names beginning with the
ORA_prefix for its own use.
See Also: "deviceSpecifier"
Note: If you do not specify the
See Also: "allocOperandList"
This example deletes backup sets from tape created more than a week ago:
ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE sbt; DELETE NOPROMPT BACKUP OF DATABASE COMPLETED BEFORE 'SYSDATE-7';
This example crosschecks all archived logs on disk (by using the preconfigured disk channel) and tape. If the logs are not found, then RMAN marks them as
EXPIRED in the repository:
In this example, you perform a crosscheck of backups on two nodes of an Oracle Real Application Clusters configuration:
ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE DISK CONNECT 'SYS/change_on_install@inst1'; ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE DISK CONNECT 'SYS/change_on_install@inst2'; CROSSCHECK BACKUP;
In this example, you delete a backup from both disk and tape:
# back up datafile to disk and tape BACKUP DEVICE TYPE DISK DATAFILE 1 TAG "weekly_bkup"; BACKUP DEVICE TYPE sbt DATAFILE 1 TAG "weekly_bkup"; # manually allocate sbt channel and disk channel ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE DISK; ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE sbt; DELETE BACKUPSET TAG "weekly_bkup";