File Name: oracle rman backup and recovery .zip
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Enterprise Manager's distributed architecture necessitates a multi-pronged approach to backup, recovery and disaster recovery planning. This chapter covers practical approaches to implementing an efficient and robust backup and recovery environment and discusses the best practices for backup and recovery of different tiers of Enterprise Manager. Although Enterprise Manager functions as a single entity, technically, it is built on a distributed, multi-tier software architecture composed of the following software components:. Each component, being uniquely different in composition and function, requires different approaches to backup and recovery. For this reason, the backup and recovery strategies are discussed on a per-tier basis in this chapter.
Table Recovery Manager Commands. Run a command file in the same directory as another command file that is currently running. The command differs from the command only when run from within a command file. Configure persistent RMAN settings. These settings apply to all RMAN sessions until explicitly changed or disabled. Determine whether files managed by RMAN, such as archived logs, data file copies, and backup pieces, still exist on disk or tape. Delete backups and copies, remove references to them from the recovery catalog, and update their control file records to status DELETED.
Use these guidelines to effectively configure, backup and restore the Oracle database. If you run more than one database application on the same UNIX client, perform the following administration on the client before you install the Oracle Agent:. You can configure the Commvault software resynchronize the metadata in the RMAN catalog with the Oracle database on a schedule for example, a weekly full schedule. Use the archive log subclient that the Commvault software creates by default, to run archive logs backup. Take the following into consideration when plan your log backup schedule:.
Database Backup. Database systems, like any other computer system, are subject to failures but the data stored in it must be available as and when required. When a database fails it must possess the facilities for fast recovery. It is a safeguard against unexpected data loss and application errors. To rectify the error, the database needs to be restored to the point in time before the error occured.
As noted earlier, using RMAN gives you access to several data backup and recovery techniques and features not available at all with user-managed backup and recovery. The most noteworthy are:. Incremental backups , which provide more compact backups storing only changed blocks and faster datafile media recovery reducing the need to apply redo during datafile media recovery. Block media recovery , in which a datafile with only a small number of corrupt data blocks can be repaired without being taken offline or restored from backup. Unused block compression , where RMAN can in some cases skip unused datafile blocks during backups.
The following sections illustrate the use of RMAN restore and recovery techniques in advanced scenarios. To move the database to a new host by means of datafile copies, you must transfer the copies manually to the new machine. This example assumes that you are using a recovery catalog. After connecting to the target database and recovery catalog, run a LIST command to see a listing of datafile copies and their associated primary keys, as in the following example:. For example, run:. Perform the restore and recovery operation described in "Performing Disaster Recovery".
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