![]() ![]() If you change the DB_NAME for a database, but not its DBID, then RMAN considers backups made of the database with the previous DB_NAME as eligible to be restored.Īn INCREMENTAL backup at level 0 backs up all data blocks in data files being backed up. RMAN backups made in a previous release of Oracle Database are usable after a database migration or upgrade. RMAN backups made on one platform are not transportable to a different platform. RMAN reports a message in V$RMAN_OUTPUT and in the output to the interactive session or log file when channel failover occurs. If multiple channels are allocated, and if one channel fails or encounters a problem during a backup step, then RMAN attempts to complete the work on another channel. RMAN can execute each independent step on any channel allocated for a specific device. RMAN decomposes a BACKUP command into multiple independent backup steps. Likewise, some features of Oracle Database, such as external tables or the BFILE data type, store data in files other than those in the preceding list. RMAN cannot make backups of other database-related files such as network configuration files, password files, the block change tracking file, and the contents of the Oracle home directory. RMAN can only back up data files, control files, server parameter files, archived redo log files, and RMAN backups of these files. RMAN has a DISK channel preconfigured but no preconfigured sbt channels. If no manual channel is allocated, then RMAN uses the default channels set with the CONFIGURE command. If no automatic channel is configured for the specified device type, then you must manually allocate a channel for each BACKUP execution. DEVICE TYPE DISK to back your database up to a writeable CD or DVD, or some other device that has a larger physical block size. However, you can encounter this limitation when using BACKUP. In practice, most disk drives have physical block sizes of 512 bytes, so this limitation rarely affects backup. For example, a disk device with a block size of 2 KB can only be used as a destination for backups of Oracle files with logical block sizes of 2 KB, 4 KB, 6 KB and so on. When backing up Oracle Database files to disk, the logical block size of the files must be an even multiple of the physical block size of the destination device. If you specify DEVICE TYPE sbt, then you can back up files to any media supported by the media manager. If the statement CREATE TABLESPACE tablespace_name DATAFILE 'filename' works, then 'filename' is a valid backup path name. You can make a backup on any device that can store a data file. If you specify DEVICE TYPE DISK, then RMAN makes backups to random access disks. RMAN can only back up files onto valid media. You cannot use RMAN to back up a NOARCHIVELOG database after an instance failure or SHUTDOWN ABORT. The shutdown is only consistent if you successfully execute the SHUTDOWN command with the NORMAL, IMMEDIATE, or TRANSACTIONAL options. If the target database is in NOARCHIVELOG mode, then the database must be mounted after a consistent shutdown when you make the backup. You must apply redo log files after restoring an inconsistent backup to make the database consistent. Backups made while the database is open are inconsistent. If the target database is in ARCHIVELOG mode, then the database must be mounted or open with a current control file. See the CONNECT and RMAN commands to learn how to connect to a database as TARGET. RMAN must be connected to a target database.
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