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The first command backs up the flash recovery area (both current and any previous locations) to tape, using defaults for the number of channels, sets, and pieces The files included in the backup are full and incremental backup sets; controlfile autobackups; datafile and archive log image copies; and archive redo logs The second command backs up all these recovery-related files, even if they are not in the flash recovery area This structure lets you create a three-tiered backup strategy: Primary storage is the live database, on disk Secondary storage is the flash recovery area, on disk Tertiary storage is the tape library A simple script to implement a backup strategy using three tiers of storage would be

run {backup recovery files delete all input; backup database plus archivelog all delete all input;}

Press CTRL-+ (Windows) or CMD-+ (Mac) to zoom in and get a closer view of the edges of your object Then press CTRL-- (Windows) or CMD-(Mac) to zoom out

The first command will move all existing backups to tape, and the second command will create a new backup of the database and any archive logs, while removing the logs from the LOG_ARCHIVE_DEST_n locations TIP The DELETE ALL INPUT clause will not be applied to the live database; it only applies to archive logs and backups The script relies on defaults for the number of channels and the size and naming of the backup sets and pieces

Every time RMAN is used, there will be at least two sessions launched against the target database: these are known as the default session and the polling session The default session is the session that invokes the kernelized PL/SQL (kernelized PL/SQL is PL/SQL that is available to the instance before a database has been mounted or opened) that implements RMAN; the polling session monitors the progress of RMAN operations Whenever RMAN reads or writes a disk or tape, it will need a third session: a channel A database of many gigabytes will take a long time to back up, even if the backup is a fast incremental To reduce the time taken, parallelize the backup by launching multiple channels The degree of parallelism achieved will be constrained by the lowest of these factors: The number of channels The number of backup sets The number of input files Each channel reads one or more files and writes one or more backups; the number of channels is therefore a hard limit on parallelism However, parallelism is applied within a backup command, not across several backup commands, so if the command itself limits the number of backup sets generated, this may limit the degree of parallelism Finally, it is not possible for the degree of parallelism to exceed the number of input files unless the multisection backup capability is enabled Consider this script:

run {allocate channel t1 type sbt; allocate channel t2 type sbt; allocate channel t3 type sbt; allocate channel t4 type sbt; backup database files per set 8;}

None Displays the extracted image against the gray checkerboard used to symbolize transparency in Photoshop Black Matte Gray Matte White Matte Other Mask Displays the extracted image against solid black background Displays the extracted image against a solid 50 percent gray background Displays the extracted image against a solid white background

The first four lines launch four arbitrarily named channels The backup command then forces RMAN to count the number of files in the database, and distribute them into backup sets containing no more than eight files each If the database consists of 100 datafiles plus the controlfile, 13 backup sets will be generated: the first 12 will each contain 8 files, the thirteenth will have the remaining 5 files The degree of parallelism will be 4: constrained by the number of channels However, if the database had only 20 datafiles, there would be only 3 backup sets produced, and the degree of parallelism would be 3; one channel would be idle If the database had only 4 datafiles, all would go into one backup set produced serially If a file is many gigabytes (or terabytes), then it will be desirable to parallelize the backup of this one file Normally, only one channel can read a file, but by using the multisection keyword this behavior can be changed:

run {allocate channel t1 type sbt; allocate channel t2 type sbt;

allocate channel t3 type sbt; allocate channel t4 type sbt; backup as compressed backupset datafile 16 section size 10g;}