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Configuring RMAN Defaults
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The Recovery Manager is meant to be easy to use out of the box, but the defaults may well not be appropriate for any one site By configuring the defaults, RMAN s operations can be customized to your environment Figure 15-1 shows the use of the SHOW command, followed by three CONFIGURE commands
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Use of SHOW and CONFIGURE to set defaults
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The SHOW command displays RMAN s configured defaults In the figure, they are all on their default values These are hard-coded To adjust these defaults, use the CONFIGURE command The first CONFIGURE command instructs RMAN to always launch four channels when backing up to disk unless a different number of channels is specified, and to always write out compressed backup sets unless some other form of backup is specified The second CONFIGURE command enables optimization This allows RMAN not to back up certain files if it considers that it already has sufficient copies of the files Optimization is related to the retention policy The default retention policy is 1, meaning that RMAN will attempt to have at least one copy of everything The third CONFIGURE command changes the retention policy to REDUNDANCY 3, meaning that RMAN will attempt to keep three copies of everything The result of the configuration adjustments shown in Figure 15-1 could be seen by running SHOW ALL again There are two possible retention policies that can be configured A redundancy level specifies a number of copies of files that should be kept If set to 3, then when RMAN makes a fourth backup of a file, it will consider the first backup to be redundant, and a candidate for deletion The alternative strategy is to set a recovery window:
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RMAN> configure retention policy to recovery window of 90 days;
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This command instructs RMAN always to keep backups of datafiles and archive logs such that it could do a point-in-time recovery to any time in the last 90 days This requires at least one backup of every datafile that is at least 90 days old, plus all the archive logs generated since then Backup optimization is really only applicable to archive logs and the datafiles of read-only or offline tablespaces If optimization is enabled, RMAN will not create additional backups of files if it already has sufficient identical copies of the files to meet its retention policy Since online read-write datafiles are always changing, RMAN will never consider that it has identical copies To return a configured setting to its out-of-the-box default, use the CLEAR command, as in this example, which uses SHOW to check values, and CLEAR to return them to default:
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RMAN> show device type; RMAN configuration parameters for database with db_unique_name ORCL are: CONFIGURE DEVICE TYPE DISK PARALLELISM 4 BACKUP TYPE TO COMPRESSED BACKUPSET; RMAN> configure device type disk clear; old RMAN configuration parameters: CONFIGURE DEVICE TYPE DISK PARALLELISM 4 BACKUP TYPE TO COMPRESSED BACKUPSET; RMAN configuration parameters are successfully reset to default value RMAN> show device type; RMAN configuration parameters for database with db_unique_name ORCL are: CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
Managing and Monitoring RMAN Backups
The RMAN executable provides commands for reporting on what backups have been made and what backups are required The same information can also be obtained through the Database Control interface, or it is possible to query the RMAN repository directly by querying various views that are populated from it If you are using a Recovery Catalog, this is another source of information RMAN can also physically remove backups from tape and disk
The LIST, REPORT, and DELETE Commands
As a general rule, LIST tells you about backups that have been made, whereas REPORT tells you what needs to be backed up The following table shows some examples of LIST:
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