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The previous examples dealt with complete-recovery scenarios. The database or the tablespace, as the case may be, are fully recovered and there s no loss of data. You use incomplete recovery in situations where you want to recover to a previous point in time, perhaps because you made a data entry error or because an online redo log was lost. After recovery, you end up with a database that s not current to the latest point in time, but it is consistent. In the following sections, you ll see how to perform incomplete recovery using RMAN and user-managed recovery procedures.
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Using RMAN for Incomplete Recovery
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You can perform three types of incomplete recovery using RMAN, provided you are running your database in the archivelog mode. You can specify a time, SCN, or log sequence number with the SET UNTIL command before using the RESTORE and RECOVER commands. Your choice of recovery type depends on the problem that prompts the incomplete recovery.
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CHAPTER 16 DATABASE RECOVERY
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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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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.
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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
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CHAPTER 16 DATABASE RECOVERY
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on the information about backups stored in its recovery catalog. RMAN applies the archived redo logs and finishes the recovery process. You can then open the database with the ALTER DATABASE OPEN RESETLOGS command. This is a point-in-time recovery (PITR), and you need to make sure that the database doesn t apply the old redo logs by mistake. You ensure this by resetting or reinitializing the redo log files. Here s the entire script for performing a tablespace PITR using RMAN: RMAN> RUN { Allocate channel s1 type 'sbt_tape'; Allocate channel s2 type 'sbt_tape'; Set until time '28-JUL-05 06:00:00'; Restore database; Recover database; Sql "alter database open reset logs"; Release channel s1; Release channel s2; } Once you query the database and verify that you have recovered it to the current point in time, you can open the database using the following command, which will undo all changes after the point in time you ve recovered to: RMAN> ALTER DATABASE OPEN USING RESETLOGS; The previous command will archive all online redo logs, reset the log sequence numbers, and give the online redo logs a new time stamp and SCN. You thus eliminate the possibility of corrupting your data files by mistakenly applying older redo logs. If you want to use a specific log sequence number instead of a point in time, you modify the script by replacing the SET UNTIL TIME line with the following: RMAN> SET UNTIL SEQUENCE 1234;
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