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CERTIFICATION OBJECTIVE 1604
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Enterprise Manager can schedule backups The mechanism is not related to the operating system s job scheduler, nor to the job scheduling system within the database It is purely an Enterprise Manager facility and is available whether you are using Grid Control or Database Control The Enterprise Manager agent runs the job according to a specified schedule The backups can be of any type (online or offline, whole or partial, and full or incremental) but will always be server managed: using RMAN
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EXERCISE 16-4 Define an Automatic Backup Job
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In this exercise, you will define a repeating backup job 1 Connect to the database with Database Control as user SYS 2 From the database home page, take the Availability tab and then the Schedule Backup link in the Manage section 3 Select the radio button for Whole Database, and click the Schedule Customized Backup button 4 In the Schedule Customized Backup: Options window, select the radio buttons for Incremental Backup, and Online Backup and the check boxes to back up
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and delete archive log files and delete obsolete backups (as shown in the next illustration) Click Next
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5 In the Schedule Customized Backup: Settings window, accept the defaults, which will direct the backup to the flash recovery area Click Next 6 In the Schedule Customized Backup: Schedule window, select the radio button for Repeating and set a schedule and time, such as daily at 02:00 Select the radio button for Repeat Until Specified Date, and enter tomorrow s date Click Next 7 In the Schedule Customized Backup: Review window, study the RMAN script that has been generated This will be more complex than any seen previously, but it is still self-explanatory Click Submit Job 8 To confirm the creation of the job, return to the database home page, and take the Jobs link in the Related Links section You will see the backup job scheduled
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Manage Backups,View Backup Reports, and Monitor the Flash Recovery Area
SCENARIO & SOLUTION
What is the best way to automate backup routines With Oracle facilities, or with operating system facilities Within the Oracle environment, you can automate backup jobs with Enterprise Manager If you are confident that the relevant processes (the Database Control processes, or the Grid Control agent) will always be running, then use them Otherwise, the operating system job scheduler may be a better option RMAN backups can do things that user-managed backups can t In particular, they can be incremental (vital for large databases) Also, the automation of restore and recovery is fantastic But you will often find a lot of opposition to RMAN coming from your system administrators Historically, they were the people who did backups, and they are very good at finding reasons why their techniques are better Their reasoning is not always fully informed and may be influenced by office politics
Is it best to use RMAN My system administrators insist that their backups (based on disk technology for creating snapshots) are faster and better
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Manage Backups,View Backup Reports, and Monitor the Flash Recovery Area
RMAN uses a repository to store details of all the backup operations it has carried out This repository is the key to automated restore and recovery, and the source of reports on backups By default, server-managed backups will go to the flash recovery area RMAN will attempt to manage space in the flash recovery area, but the DBA must monitor it as well
The RMAN Repository
During a backup operation, RMAN will write to its repository all detail of the backup: what was backed up, where the backup files are, the time and system change number of certain events, and so on For a datafile restore operation, RMAN must determine the most recent backup (either full or level 0) from which to extract the file should be extracted Then to
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