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Creating the Virtual Private Catalog
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Once you ve created the new virtual recovery catalog owner, create the virtual private catalog using the following steps: 1. Connect to the base recovery catalog database as the new virtual private catalog owner. For example: RMAN> CONNECT CATALOG virtual1/virtual1@catdb; 2. Issue the command to create the virtual private catalog: RMAN> CREATE VIRTUAL CATALOG;
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The user virtual1 is now ready to work with the virtual private catalog, with access to one database, prod1.
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Dropping a Virtual Private Catalog
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The base recovery catalog owner can drop the virtual private catalog in a similar fashion as the base recovery catalog, by issuing the following command: RMAN> DROP CATALOG;
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Revoking Access Granted Through a Virtual Private Catalog
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To revoke access to any database from the virtual private catalog owner, issue the REVOKE CATALOG command as shown here: RMAN> REVOKE CATALOG FOR DATABASE prod1 FROM virtual1; You can provide a database name as shown here or the DBID for the database. You can revoke the right of the virtual private owner to register new databases in the virtual private catalog (and thus in the base recovery catalog) by issuing the following command: RMAN> REVOKE REGISTER DATABASE FROM virtual1;
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Examples of RMAN Backups
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The following sections take you through a few examples of various kinds of backups you can perform using RMAN.
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Backing Up an Entire Database
If you want to back up the entire database, you use the BACKUP DATABASE command. RMAN will automatically back up all the datafiles that are part of the database, as shown in Listing 15-3. Listing 15-3. Backing Up a Database Using RMAN RMAN> BACKUP DATABASE; Starting backup at 06-JUN-08 using channel ORA_DISK_1 channel ORA_DISK_1: starting full datafile backupset channel ORA_DISK_1: specifying datafile(s) in backupset input datafile fno=00001 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\SYSTEM01.DBF input datafile fno=00003 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\SYSAUX01.DBF input datafile fno=00005 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\EXAMPLE01.DBF input datafile fno=00002 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\UNDOTBS01.DBF input datafile fno=00004 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\USERS01.DBF . . . Starting Control File Autobackup at 06-JUN-08 piece handle=C:\ORACLE\PRODUCT\10.1.0\FLASH_RECOVERY_AREA\ORCL\AUTOBACKUP\2005_06 _06\O1_MF_N_539094997_0PJ8FDBF_.BKP comment=NONE Finished Control File Autobackup at 06-JUN-08 RMAN>
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Backing Up the Archived Logs
You use the BACKUP ARCHIVELOG ALL command to back up all archived logs that you haven t backed up before. You can also use the command BACKUP DATABASE PLUS ARCHIVELOG to back up all datafiles as well as any archived redo log files, as shown in Listing 15-4. Listing 15-4. Backing Up a Database and Archived Logs Using RMAN RMAN> BACKUP DATABASE PLUS ARCHIVELOG; Starting backup at 06-JUN-08 current log archived allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=38 devtype=DISK channel ORA_DISK_1: starting archive log backupset channel ORA_DISK_1: specifying archive log(s) in backup set input archive log thread=1 sequence=4 recid=1 stamp=539702327 . . . 16\O1_MF_ANNNN_TAG20041016T132206_0Q2SPK4S_.BKP comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:00:05 Finished backup at 06-JUN-08 RMAN>
Note If you re running in archivelog mode, your redo log files are being archived continuously. Therefore, there s no need to back up your online redo log files. In fact, RMAN doesn t let you back up the online redo log files. The best way to protect the online logs against media failure is to multiplex them, with duplicate online log members on different disks attached to different disk controllers. Losing an online redo log could mean loss of data if you don t have a copy.
Performing an Online Backup with a Script
The RMAN utility performs online backups in a more efficient manner than the normal user-managed backups, besides providing many extra benefits that make the backups far easier and safer. For one thing, you don t need to place the tablespaces into the begin backup and end backup modes. In addition, you back up only the used space in the database, not the entire allocated space. You also take care of any fractured blocks, because RMAN will continue to read the blocks until it gets a consistent read.
Caution
You should never back up your online redo log files when performing an online backup, because you ll run the risk of accidentally restoring the backed up log files and thus corrupt your database.
Listing 15-5 shows a typical script that performs online backups using RMAN, assuming you are backing up to disk.
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