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A crosscheck forces RMAN to compare its repository with the real world It will check that all the backups it has made do still exist, on disk or tape Any that it finds to be missing are flagged as EXPIRED This will remove all references from the repository to expired backups If the backups have merely been moved (off site, perhaps), an alternative is to mark them as UNAVAILABLE This will force RMAN to apply its retention policy It will delete all backups that it considers to be no longer necessary from disk or tape, and remove the references to them from its repository This command lets you inform RMAN about additional user-managed backups, so that RMAN can include them in its repository If backups have been moved, CATALOG can also be used to tell RMAN the new locations
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To use these commands through Database Control, from the database home page take the Availability tab, then the Manage Current Backups link in the Manage section Figure 16-2 shows the Manage Current Backups window: note the buttons that give access to the commands in the preceding list
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Once use of a flash recovery area has been configured, it is vital to monitor how much space is being taken up within it Figure 16-3 shows the Database Control Monitoring window To reach this, from the database home page take the Availability tab, and then the Recovery Settings link in the Setup section The flash recovery area is shown in the bottom part of the window In the figure, first note on the left-hand side the values for the two parameters that manage the flash recovery area: DB_RECOVERY_FILE_DEST is set to /u01/ app/oracle/flash_recovery_area and DB_RECOVERY_FILE_DEST_SIZE is set to 35 GB Beneath these, note that there is 40 MB of reclaimable space: this is space occupied by backups that the Recovery Manager can reuse when necessary, or that could be cleared manually with the DELETE OBSOLETE command The pie chart on the right-hand side of the figure shows the contents of the flash recovery area: the bulk of the space used is backup sets (stored as pieces) and image copies, with a small amount of space taken up by archived logs
16:
Performing Database Backups
FIGURE 16-3
The flash recovery area, monitored with Database Control
The same information could be obtained by querying the views V$RECOVERY_ FILE_DEST and V$FLASH_RECOVERY_AREA_USAGE, as in Figure 16-4
FIGURE 16-4
The flash recovery area, monitored with SQL*Plus
Manage Backups,View Backup Reports, and Monitor the Flash Recovery Area
EXERCISE 16-5 Manage RMAN Backups
In this exercise, you will use the RMAN utility to manage the backups made in previous exercises 1 Connect to the database with the RMAN executable, from an operating system prompt using operating system authentication:
rman target /
2 Query the server-managed backups made so far:
list backup of database;
This will list at least four backup sets: the full backup of the whole database made in Exercise 16-1, the full partial backup (just the SYSAUX datafile) made in Exercise 16-2, and the two incremental partial backups of the SYSTEM tablespace made in Exercise 16-3 3 Catalog the user-managed backup of SYSAUX tablespace made in Exercise 16-2 Use this command, substituting the path and name you used when making the copy:
catalog datafilecopy '/u01/app/oracle/oradata/orcl11g/ sysaux01dbfbak';
4 Confirm the success of the catalog with this command:
list copy of tablespace sysaux;
5 Exit from the RMAN executable:
exit;
16:
Performing Database Backups
CERTIFICATION SUMMARY
A user-managed backup is made with operating system commands and with SQL*Plus commands Server-managed backups are made with the Recovery Manager, controlled either through the RMAN executable or Enterprise Manager Backups can be open or closed, whole or partial, full or incremental But the full range of choices is available only if the database is in archivelog mode and you use RMAN In noarchivelog mode, if making a user-managed backup, the only option is closed-whole-full A server-managed backup can also be closed-whole-incremental In archivelog mode, open and partial backups are a possibility with both server- and user-managed backups but only server-managed backups can be incremental
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