CONFIGURE RETENTION POLICY TO REDUNDANCY 0

Question

Our database is 11g R2, below is our RMAN script
Presently our retention policy is 1, so 1 backup is retained along with the current backup.
I Just want to have 1 backup, i.e RMAN should take the backup and delete the old bacup.
Will it work if i change the retention policy to 0 ?
RUN
  ALLOCATE CHANNEL ch1 DEVICE TYPE DISK;
  ALLOCATE CHANNEL ch2 DEVICE TYPE DISK;
  ALLOCATE CHANNEL ch3 DEVICE TYPE DISK;
  DELETE NOPROMPT OBSOLETE;
  BACKUP DATABASE INCLUDE CURRENT CONTROLFILE format 'G:\Oracle\flash_recovery_area\BACKUPSET\tmp\rman_backup\df_%d_%s_%p_%T';
  SQL "ALTER SYSTEM ARCHIVE LOG CURRENT";
  BACKUP ARCHIVELOG ALL DELETE INPUT format 'G:\Oracle\flash_recovery_area\BACKUPSET\tmp\rman_backup\df_%d_%s_%p_%T';
RMAN> show all
2> ;
using target database control file instead of recovery catalog
CONFIGURE RETENTION POLICY TO REDUNDANCY 1;
CONFIGURE BACKUP OPTIMIZATION OFF; # defaultEdited by: user10243788 on Apr 24, 2012 1:14 AM

Answer 1

user10243788 wrote:
Our database is 11g R2, below is our RMAN script
Presently our retention policy is 1, so 1 backup is retained along with the current backup.
I Just want to have 1 backup, i.e RMAN should take the backup and delete the old bacup.
Will it work if i change the retention policy to 0 ?You cannot set the retention policy to redundancy 0 because redundancy count must be greater than zero.
>
RUN
ALLOCATE CHANNEL ch1 DEVICE TYPE DISK;
ALLOCATE CHANNEL ch2 DEVICE TYPE DISK;
ALLOCATE CHANNEL ch3 DEVICE TYPE DISK;
DELETE NOPROMPT OBSOLETE;
BACKUP DATABASE INCLUDE CURRENT CONTROLFILE format 'G:\Oracle\flash_recovery_area\BACKUPSET\tmp\rman_backup\df_%d_%s_%p_%T';
SQL "ALTER SYSTEM ARCHIVE LOG CURRENT";
BACKUP ARCHIVELOG ALL DELETE INPUT format 'G:\Oracle\flash_recovery_area\BACKUPSET\tmp\rman_backup\df_%d_%s_%p_%T';
}Just switch the order of operation:
use
BACKUP DATABASE INCLUDE CURRENT CONTROLFILE format 'G:\Oracle\flash_recovery_area\BACKUPSET\tmp\rman_backup\df_%d_%s_%p_%T';
DELETE NOPROMPT OBSOLETE;
instead of
DELETE NOPROMPT OBSOLETE;
BACKUP DATABASE INCLUDE CURRENT CONTROLFILE format 'G:\Oracle\flash_recovery_area\BACKUPSET\tmp\rman_backup\df_%d_%s_%p_%T';
You can also exclude the operation SQL "ALTER SYSTEM ARCHIVE LOG CURRENT" because BACKUP ARCHIVELOG ALL implicitly switch logfile before archiving.