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it will back up all data blocks changed since level 0 or level 1. Although you can perform a level 2 incremental backup, according to Oracle, only level 0 and level 1 are permitted. The size of your incremental backup file will depend on the number of changed blocks and the incremental level. Cumulative backups will, in general, be larger than differential backups, since they duplicate the data copied by backups at the same level. However, cumulative backups have the advantage that they reduce recovery time, because you apply only one backup. Thus, Oracle recommends using cumulative backups, if space isn t a problem on your server. Here s an example that shows how you can use a combination of incremental backups to come up with your backup strategy: On Sunday, perform an incremental level 0 backup. On Monday through Saturday, perform differential incremental level 1 backups. Repeat the cycle next week. In this strategy, if you need to recover data on Thursday evening, you apply the incremental backups from Monday, Tuesday, and Wednesday to Sunday s level 0 backup. Consider an alternative strategy using cumulative backups: On Sunday, perform an incremental level 0 backup. On Monday through Saturday, perform cumulative incremental level 1 backups. Repeat the cycle next week. Note that in this case, the daily cumulative level 1 backup backs up all blocks changed since the Sunday backup. Thus, if you need to recover your database on Thursday, you need to apply only one cumulative backup from the night before to Sunday s incremental level 0 backup.
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You can t use the ALLOCATE CHANNEL and SWITCH commands as stand-alone commands. You must use them with the RUN command, as follows: RMAN> RUN {ALLOCATE CHANNEL c1 DEVICE TYPE PARMS='ENV=(NSR_GROUP=default)'; BACKUP DATAFILE 1; } allocated channel: c1 channel c1: sid=11 devtype=SBT_TAPE channel c1: MMS Version 2.2.0.1 sbt
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The SWITCH command is similar to the ALTER DATABASE RENAME DATAFILE command. It lets you replace a datafile with file copy made by RMAN.
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The RMAN BACKUP AS COPY command makes a plain copy of a datafile (you can also use the old COPY command to do this, but Oracle deprecated the COPY command in Oracle Database 10g). These image copies are identical to the copies made by using operating system utilities. Here s an example: RMAN> BACKUP AS COPY DATAFILE 1; Starting backup at 05-JUN-08 using channel ORA_DISK_1 channel ORA_DISK_1: starting datafile copy input datafile fno=00001 name=C:\ORALE\PRODUCT\11.1.0\ORADATA\NEWS\SYSTEM01.DBF
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output filename=C:\ORALE\PRODUCT\11.1.0\FLASH_RECOVERY_AREA\NEWS\DATAFILE\O1_MF_ SYSTEM_0Q2XPZ1Y_.DBF tag=TAG20041016T143037 recid=2 stamp=539706790 channel ORA_DISK_1: datafile copy complete, elapsed time: 00:02:35 channel ORA_DISK_1: starting datafile copy copying current controlfile output filename=C:\ORALE\PRODUCT\11.1.0\FLASH_RECOVERY_AREA\NEWS\CONTROLFILE\O1_ MF_TAG20041016T143037_0Q2XVT4T_.CTL tag=TAG20041016T143037 recid=3 stamp=5397067 96 channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07 Finished backup at 05-JUN-08 RMAN> The following example illustrates the use of the older COPY command: RMAN> COPY DATAFILE 1 TO 'c:\download\test.copy'; Starting backup at 05-JUN-08 using channel ORA_DISK_1 channel ORA_DISK_1: starting datafile copy input datafile fno=00001 name=C:\ORALE\PRODUCT\11.1.0\ORADATA\ORCL\SYSTEM01.DBF output filename=C:\DOWNLOAD\TEST.COPY tag=TAG20041009T124719 recid=2 stamp=53909 channel ORA_DISK_1: datafile copy complete, elapsed time: 00:01:35 Finished backup at 05-JUN-08 RMAN>
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You use the DELETE command to remove physical backups made by RMAN. The DELETE command deletes physical backups, updates control file records to indicate that the backups are deleted, and also removes their records from the recovery catalog (if you use one). You can delete backup sets, archived redo logs, and datafile copies.
Caution
Always use RMAN S DELETE command, rather than an operating system deletion command, to remove RMAN backups. Otherwise, the RMAN repository will contain records of backups that are no longer available.
The following example deletes all archived redo logs that RMAN has backed up at least twice to tape: RMAN> DELETE ARCHIVELOG ALL BACKED UP 2 TIMES TO DEVICE TYPE sbt; The DELETE OBSOLETE command will remove all backups you no longer need. You can run DELETE OBSOLETE periodically to delete all backups that are obsolete. A backup is obsolete if it s no longer needed for database recovery, according to your retention policy. The DELETE EXPIRED command removes the recovery catalog records for expired backups and marks them as DELETED. This command is handy when you think you might have deleted RMAN backups or archived logs from disk with an operating system utility. You can first run the CROSSCHECK command so RMAN can mark the backups it can t find as expired. An expired backup means that the backup file can t be found by RMAN. You can then use the DELETE EXPIRED command to remove the records for these files from the control file and the recovery catalog.
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