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RMAN (Recovery Manager) is an Oracle tool for backing up (backup), restoring (restore), and restoring (recover) databases. RMAN can only be used in ORACLE8 or later. It can back up the entire database or database parts, such as tablespaces, data files, control files, archive files, and Spfile parameter files. RMAN also allows you to perform incremental block-level backups, and incremental RMAN backups are time-and space-efficient because they only back up those blocks that have changed since the last backup. Moreover, through the interface provided by RMAN, third-party backup and recovery software such as veritas will provide more powerful backup and recovery management functions. Through RMAN, it also provides other more functions, such as database cloning, using RMAN to establish a standby database, using RMAN to back up and move files on bare devices (RAW) and other work will become more convenient and simple. 9i's RMAN will make backup and recovery faster and more perfect through enhanced automatic configuration and management, as well as unique block-level recovery.

There are certain restrictions on storing archival information in control files. If too much content is stored, the previously expired or useless records will be overwritten after the storage is finished. In general, recyclable records in the control file need to be retained for at least 7 days before they can be overwritten.

Configuring the RMAN control file to back up automatically avoids the loss of RMAN backup information when all copies of the control file are unavailable. In this way, whenever you use the backup command or the structure of the database changes, RMAN backs up the control files.

RMAN > CONFIGURE CONTROLFILE AUTOBACKUP ON; replaces the recovery directory with the target database control file

New RMAN configuration parameters:

CONFIGURE CONTROLFILE AUTOBACKUP ON; successfully stored new RMAN configuration parameters

Summary

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