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RMAN backups are performed using the BACKUP statement

To perforn a full database backup use:

To backup all archive logs use:

To backup the database and all archive log files use:

Note that the PLUS ARCHIVELOG clause performs the following:

1. Runs the ALTER SYSTEM ARCHIVE LOG CURRENT command
2. Runs the BACKUP ARCHIVELOG ALL command. If backup optimization is enabled only backs up logs that have not already been backed up.
3. Backs up files specified in the BACKUP command
4. Runs the ALTER SYSTEM ARCHIVE LOG CURRENT command
5. Backs up any remaining archived logs including those generated during thebackup

A FORMAT can be specified for each subclause in the BACKUP DATABASE PLUS ARCHIVELOG command. For example:

Note that FORMAT clause precedes the DATABASE clause, but follows the PLUSARCHIVELOG clause.

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The BACKUP command can be extended to backup the current control file and the SPFILE.

For example:

Controlfile backups

The current controlfile can be automatically backed up by the BACKUP command by configuring the CONTROLFILE AUTOBACKUP parameters

To backup the current controlfile explicitly use:

SPFILE backups

The SPFILE can be automatically backed up with the control file during database backups by configuring the CONTROLFILE AUTOBACKUP parameters

To backup up the SPFILE explicitly use:

Datafile backups

To backup a specific data file use BACKUP DATAFILE. For example:

Altermatively specify the data file number. For example:

The data file number can be obtained from V$DATAFILE. For example:

Tablespace Backups

To backup a tablespace use the BACKUP TABLESPACE command. For example:

Compressed Backups

To compress the backup use:

The resulting compressed backup is around 20%-30% of the size of the uncompressed equivalent.

Format clause

The format clause allows the backup files to be directed to a specificlocation.

For example:

The above statement created the following files in /u01/app/oracle/backup:

Other formats can be specified. For example:

In the above example %t is the backup set timestamp, %s is the backup set number and %p is the piece number within the backup set.

Tags

A backup tag can optionally be specified with the BACKUP command.

For example:

The tag is reported by the LIST command.

If a tag is not specified then a system-generated tag is assigned.

Incremental Backups

By default backups are full (level 0). Backups can also be incremental (level 1).

Incremental backups can be:

• Differential - includes all changes since the last full or incrementalbackup
• Cumulative - includes all changes since the last full backup

Differential backups require less space. Cumulative backups are faster to restore

Differential backups are the default.

To run a diffential incremental backup use:

To run a cumulative incremental backup use:

Note that in order to take a level 1 backup, a level 0 backup must alreadyexist.

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A full backup using BACKUP DATABASE is not the same as a level 0 backup. - the LV column of the LIST BACKUP output is NULL after a full backup.

In order to take a level 0 backup use

To create an image copy of an entire database use:

To create an image copy of a specific datafile use:

For example:

Alternatively specify the source file name. For example:

Recovery Area

To backup the recovery area use:

Note that a destination must be specified if the recovery area is being backed up to disk.