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3. Use the RECOVER DATABASE command to start recovering the database. The AUTOMATIC keyword tells Oracle to automate the application of the archived redo logs. In this example, I m assuming that you re placing the archived redo logs in the default location specified in the init.ora file or SPFILE. SQL> RECOVER AUTOMATIC DATABASE; If you ve placed them in a different location, you ll have to supply the location to Oracle by using the LOGSOURCE parameter of the SET statement, or the RECOVER FROM parameter of the ALTER DATABASE statement. Here are examples of each method of specifying an alternative location for the archived redo log files: SQL> SET LOGSOURCE /new_directory; SQL> ALTER DATABASE RECOVER FROM '/new_directory'; 4. Open the database once you re sure Oracle has completed media recovery: Media recovery complete. SQL> ALTER DATABASE OPEN;

Order Processing System (OPS)

You need to perform a tablespace recovery when you lose one or more datafiles that belong to the tablespace and you don t have a mirrored copy of the files. The recovery may be open or closed, and it may be a full recovery or a point-in-time recovery, as explained at the beginning of this chapter. You can recover using either RMAN or user-managed techniques.

Sometimes you may have to recover a tablespace or a set of tablespaces. You can use the RESTORE and RECOVER commands at the tablespace level for these situations. Since only a part of the database is affected, you don t have to shut down the database you can leave it open instead. If you wish, you can shut down the database in the mount mode, if several tablespaces or a single very large tablespace is affected. Here are the recovery steps: 1. Take the tablespace you re going to recover offline. The rest of the database will be functioning normally after you do this: RMAN> ALTER TABLESPACE sysaux OFFLINE; 2. Restore the tablespace using the RESTORE TABLESPACE command, as follows: RMAN> RESTORE TABLESPACE sysaux; Starting restore at 29-MAR-08 using channel ORA_DISK_1 . . . channel ORA_DISK_1: restore complete Finished restore at 29-MAR-08 RMAN>

3. Recover the tablespace, as follows: RMAN> RECOVER TABLESPACE sysaux; Starting recover at 29-MAR-08 using channel ORA_DISK_1 starting media recovery archive log thread 1 sequence 12 is already on disk as file . . . media recovery complete Finished recover at 29-MAR-08 RMAN> 4. Finally, bring the recovered tablespace online, as follows: RMAN> ALTER TABLESPACE sysaux ONLINE;

Messaging Server (MS)

Say your database is online, and one or more files belonging to it are damaged. If the database writer can t write to the damaged files, Oracle will take the files offline automatically. Otherwise, you must first take the tablespace offline. Then you need to restore the damaged datafiles and perform a recovery. Here s a summary of the recovery process: 1. Take the affected tablespace offline: SQL> ALTER TABLESPACE sales01 OFFLINE IMMEDIATE; 2. Restore the damaged files: SQL> HOST cp /u01/app/oracle/backup/shan/sales_01.dbf /u01/app/oracle/oradata/shan/sales_01.dbf 3. Recover the offline tablespace: SQL> RECOVER TABLESPACE sales01; 4. Bring the tablespace you just recovered online: SQL> ALTER TABLESPACE sales01 ONLINE;

The procedures for recovering from the loss of a datafile depend on the type of tablespace the datafile belongs to. You can use the dynamic performance view V$RECOVER_FILE to determine the files you need to recover. Let s see what happens when your instance encounters media errors, assuming you are operating in the archivelog mode. If your instance encounters a read error and can t read a datafile, you ll see an operating system error stating this fact, but the database will continue to operate. When the database tries writing the file header during a checkpoint, a write error will be issued. If the instance encounters a write error and can t write to a System or undo tablespace datafile, the instance will immediately shut down. If the write error pertains to any other tablespace, the database will take that datafile offline the other datafiles in the tablespace containing this datafile will remain online. Your job then is to restore and recover the affected datafile. The following discussion deals with the loss of a datafile from a non-System tablespace.

Email Server (ES)