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CHAPTER 15 BACKING UP DATABASES
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Media familites are a way of grouping together tape volumes with similar write periods and retention policies. You could, for example, create a media family for all of your onsite full backups. Similarly, you can create another media family for your offsite full backups. You could also define a separate media family for all your incremental backups. Oracle Backup lets you classify your backup media using the following criteria: Volume identification sequence: Each tape volume has a unique identifier attached to it, when it s either written to the first time or overwritten from the beginning of the tape. Write-allowed period: Oracle Backup can write to a volume set until a predetermined writeallowed period has expired, at which time it closes the volume to further updates. Retention period: Oracle Backup determines the expiration date and time for each volume set when you first create the set. You can t write to the set past the expiration date.
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You use Oracle database objects to represent backup and restore parameters that describe your Oracle database. RMAN accesses the database, and Oracle Backup manages the media. Database objects act as intermediaries between RMAN and the Oracle Backup software. Oracle database objects provide necessary information for Oracle Backup to interact with RMAN. RMAN provides the database name, content type, and copy number to Oracle Backup. Based on that information, Oracle Backup determines the Oracle database object.
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Performing Backups with Oracle Backup
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Before you can back up data, you must log in to Oracle Backup as a user having the privileges to perform the backup and create a dataset. A dataset is a description file that identifies data you want to back up. You can back up data in two different ways: On demand: You can create immediate, one-time use backup jobs and send your requests to the scheduler when you re ready. Oracle Backup then turns it into a dataset job, making it eligible to run. Scheduled jobs: You can use the Oracle Backup scheduler to schedule jobs. You can specify backups in terms of day, days of the week, month, quarter, or year.
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Expert users can use the obtar command-line tool to work directly with tape drives, bypassing the Oracle Backup s scheduler.
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You can also specify backup windows, to minimize the impact on day-day-day operations.
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User-Managed Backups
RMAN is the Oracle-recommended method for backing up and recovering databases. RMAN is designed to take advantage of its knowledge of Oracle s block structures to provide excellent performance, including features like compression, resumable backups and recovery, block-change tracking, and integration with the MML. However, you can make completely valid backups yourself,
CHAPTER 15 BACKING UP DATABASES
without the use of RMAN or the Oracle Backup tool, by using operating system copy commands such as cp and dd in UNIX, and the copy command in Windows systems. You can also connect to a media manager if you want to make tape backups. If you choose this approach, you must keep track of all the backups, check their validity, and also decide which of the backups you ll need during a recovery session. This is the reason Oracle calls this method user-managed backups. If you have a simple Oracle database and your backup requirements aren t onerous, you may decide that it s not worth the time and effort that you need to invest in ascending the learning curve associated with RMAN. For you, user-managed backups are probably the ideal solution, even if it means that you lose all the special features that Oracle has built into the RMAN tool.
Making Whole Database Backups
You can make a backup of the entire database when the database is closed or when it s open, provided you re operating in archivelog mode. If you re using noarchivelog mode, you can make only a closed database backup.
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