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Finally, remember that Oracle may automatically purge objects from the Recycle Bin if it experiences space pressure. It will start with the oldest objects.

Make sure that the database in which the recovery catalog is being created runs in archivelog mode. This ensures that you can always perform a PITR.

To retrieve a table using the FLASHBACK TABLE table_name TO BEFORE DROP command, you must either be the owner or have the drop privileges (DROP TABLE or DROP ANY TABLE) on a table. To use the PURGE command, you need similar privileges. You must have the SELECT privilege and the FLASHBACK privilege on an object in order to query that object in the Recycle Bin.

To create the recovery catalog, you must first connect to the database in which you want to create the recovery catalog. You need to create a new recovery catalog owner schema (usually named rman), grant the necessary privileges to it, and then create the recovery catalog. Once you create the catalog, you can register databases in it.

Before Oracle Database 10g, if you suffered logical database corruption, you would undertake traditional point-in-time recovery techniques, restoring data file backup copies and then using archived

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In order to use the recovery catalog, you need to first create a recovery catalog schema. You can create this schema or user in an existing tablespace or in a new tablespace created for this purpose. The recovery catalog itself is stored in the default tablespace of this schema. The following example creates a schema called rman: SQL> CREATE USER RMAN IDENTIFIED BY rman TEMPORARY TABLESPACE temp DEFAULT TABLESPACE rman_tbsp QUOTA UNLIMITED ON rman_tbsp User created. SQL> Make sure you first create the rman_tbsp tablespace for the user rman.

redo logs to advance the database forward. This was often time-consuming and cumbersome. No matter how limited the extent of the corruption, you would need to restore entire data files and apply the archived redo logs.

The new rman schema owner, rman, needs privileges to maintain and query the recovery catalog. You do this by granting the user the RECOVERY_CATALOG_OWNER role. The following code shows how to make the necessary grants to user rman: SQL> GRANT RECOVERY_CATALOG_OWNER TO rman; Grant succeeded. SQL>

Oracle can check data block integrity by computing checksums before writing the data blocks to disk. When the block is subsequently read again, the checksum for the data block is computed again, and if the two checksums differ, there is likely corruption in the data block. By setting the DB_BLOCK_CHECKSUM initialization parameter to FULL, you can make the database perform the check in the database buffer cache itself, thus eliminating the possibility of corruption at the physical disk level. The DB_BLOCK_CHECKSUM parameter is FALSE by default.

You can connect to RMAN in one of two ways. One way is to first invoke RMAN, and then use the CONNECT CATALOG command to connect to it, as shown here (nicko is the database containing the recovery catalog in this example): $ rman Recovery Manager: Release 11.1.0.6.0 - Production on Thu Mar 27 11:36:34 2008 Copyright (c) 1982, 2007, Oracle. All rights reserved. RMAN> CONNECT CATALOG rman/rman@nicko connected to recovery catalog database RMAN> You can also connect directly from the operating system level, as follows: $ rman CATALOG rman/rman@nicko connected to recovery catalog database RMAN> When you connect to the catalog database directly, you still aren t connected to the target database (unless the target and the catalog database are the same). To connect to the target database, you must now use the following command from within the RMAN interface (nina is the target database name): RMAN> connect target nina Connected to target database: NINA (DBID=1974138212) RMAN>

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