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This is because the control file allocates a finite space for backup-related activities, while the recovery catalog has more room for storing backup history One recovery catalog in your system can perform backup, restore, and recovery activities for dozens of Oracle databases Thus, you can centralize and automate backup and recovery operations by using the recovery catalog Oracle recommends that you use a dedicated database for running the recovery catalog, but it isn t absolutely necessary..

Time-based recovery: In this type of recovery RMAN restores and recovers all files in the database up to a point in time. This is helpful if you know that a problem, such as the accidental dropping of a table, occurred at a certain point in time. You use the SET UNTIL command to perform a time-based recovery, as in this example: SET UNTIL TIME 'Mar 21 2005 06:00:00' Change-based SCN: You can perform the recovery up to a specific SCN if you know it. You use the keywords SET UNTIL SCN to specify that files up to that SCN be used. Here is an example: SET UNTIL SCN 1000 Log sequence based recovery: You can recover until a particular log sequence number. RMAN selects the files to recover up to but not including the specified sequence number. You use the SET UNTIL SEQUENCE command for a log sequence based recovery: SET UNTIL SEQUENCE 9923 Let s look at an example of a time-based recovery within the current incarnation of the database. Assume that table test was accidentally dropped right before 4 PM. Listing 16-5 shows the time-based recovery process. Listing 16-5. A Time-Based Incomplete Recovery Using RMAN RMAN> STARTUP MOUNT RMAN> RUN 2> {set until time 'Jun 30 2005 18:00:00'; 3> restore database; 4> recover database; 5> } executing command: SET until clause restoring datafile 00024 to /test02/app/oracle/oradata/temp_01.dbf channel ORA_DISK_1: restored backup piece 1 piece handle=/test01/app/oracle/oradata/backup /2ddp387s_1_1 tag=null params=NULL channel ORA_DISK_1: restore complete Finished restore at 30-JUN-05 Starting recover at 30-JUN-05 using channel ORA_DISK_1 starting media recovery media recovery complete Finished recover at 30-JUN-05 RMAN> ALTER DATABASE OPEN RESETLOGS; Database opened. RMAN>

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Note You re strongly advised to use the recovery catalog so you can take advantage of the full range of features provided by RMAN. The discussion of RMAN s features in this chapter and the next assumes the existence of the recovery catalog.

For this tablespace point-in-time recovery (TSPITR) recovery to succeed, you must have backups of all data files from before the target point in time (or SCN). You must also have all archived redo logs for the period between the SCN of the backups and the target SCN.

You can make backups directly to your operating system disks using RMAN. If you want to make backups to tape, you ll need additional software called an MML or a media manager. RMAN can move backups on disk to tape and restore the tape backups if necessary. Oracle Database 11g contains a proprietary media management product, called Oracle Secure Backup, which I discuss in the Oracle Secure Backup section later in this chapter.

In Listing 16-5, the database is first mounted but not opened. RMAN is asked to restore the database (meaning that it is asked to get the backed-up data files that are necessary for this restore). It then is asked to recover the database. RMAN knows which archived redo logs are needed based

You can connect to RMAN by simply typing rman at the operating system prompt. (Make sure you ve set the path variables correctly; in some operating systems, such as SUSE Linux, you may get the operating system s utility, named rman, instead of Oracle s RMAN utility.) This will get you the RMAN> prompt, at which point you can type in the various commands. You can also use the RMAN commands in batch mode or through pipes by using Oracle s DBMS_PIPE package. You don t need to be a SYSDBA privilege holder to just connect to the RMAN catalog; you can do so with the special rman account and password. As you ll see later in the Creating the Recovery Catalog section, the user rman is the owner of the catalog. You can connect to RMAN through database password authentication. You can also connect to the database using operating system authentication. The following sections describe each of these methods.

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