rman backup database force 功能

本文详细介绍了RMAN中FORCE选项的作用及其使用场景。当启用FORCE选项时,RMAN将忽略备份优化设置,确保所有指定文件都会被备份,即使这些文件之前已被备份。通过示例演示了如何使用FORCE选项进行全库备份。

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FORCE
Causes RMAN to ignore backup optimization. In other words, even if CONFIGURE BACKUP OPTIMIZATION is set to ON, RMAN backs up all specified files.


Note: You can also specify this option in the backupSpecOperand clause.
加上FORCE选项,则RMAN忽略调CONFIGURE里的优化功能选项.
比如:你配置了RMAN优化功能为ON,之前对只读表空间作了备份,这时,再备份全库,不加FORCE.
则RMAN不会备份只读表空间,因为之前已经备份过,加上FORCE,则RMAN忽略掉优化功能,
作全库备份.


RMAN> show all;


RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION ON;


SQL> alter tablespace tools read only;


Tablespace altered.
RMAN> backup tablespace tools;


Starting backup at 21-DEC-07
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00004 name=D:ORACLEORADATAPAULTOOLS01.DBF
channel ORA_DISK_1: starting piece 1 at 21-DEC-07
channel ORA_DISK_1: finished piece 1 at 21-DEC-07
piece handle=D:BACKUP3IJ454LF_1_1 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 21-DEC-07


Starting Control File and SPFILE Autobackup at 21-DEC-07
piece handle=D:BACKUPC-1605165889-20071221-03 comment=NONE
Finished Control File and SPFILE Autobackup at 21-DEC-07


RMAN> backup database;


Starting backup at 21-DEC-07
using channel ORA_DISK_1
skipping datafile 4; already backed up 3 time(s)
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00001 name=D:ORACLEORADATAPAULSYSTEM01.DBF
input datafile fno=00002 name=D:ORACLEORADATAPAULUNDOTBS01.DBF
input datafile fno=00003 name=D:ORACLEORADATAPAULINDX01.DBF
input datafile fno=00005 name=D:ORACLEORADATAPAULUSERS01.DBF
channel ORA_DISK_1: starting piece 1 at 21-DEC-07
channel ORA_DISK_1: finished piece 1 at 21-DEC-07
piece handle=D:BACKUP3KJ454M1_1_1 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:45
Finished backup at 21-DEC-07


Starting Control File and SPFILE Autobackup at 21-DEC-07
piece handle=D:BACKUPC-1605165889-20071221-04 comment=NONE
Finished Control File and SPFILE Autobackup at 21-DEC-07


RMAN> backup database force;


Starting backup at 21-DEC-07
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00001 name=D:ORACLEORADATAPAULSYSTEM01.DBF
input datafile fno=00002 name=D:ORACLEORADATAPAULUNDOTBS01.DBF
input datafile fno=00003 name=D:ORACLEORADATAPAULINDX01.DBF
input datafile fno=00005 name=D:ORACLEORADATAPAULUSERS01.DBF
input datafile fno=00004 name=D:ORACLEORADATAPAULTOOLS01.DBF
channel ORA_DISK_1: starting piece 1 at 21-DEC-07
channel ORA_DISK_1: finished piece 1 at 21-DEC-07
piece handle=D:BACKUP3MJ454NL_1_1 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:55
Finished backup at 21-DEC-07


Starting Control File and SPFILE Autobackup at 21-DEC-07
piece handle=D:BACKUPC-1605165889-20071221-05 comment=NONE
Finished Control File and SPFILE Autobackup at 21-DEC-07


RMAN>
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