Backing up the database from snapshot volumes (dbed_vmclonedb)
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Backing up the database from snapshot volumes (dbed_vmclonedb)

Snapshots are most commonly used as a source for backing up a database. The advantage of using snapshot volumes is that the backup will not contest the I/O bandwidth of the physical devices. Making the snapshot volumes available on a secondary host will eliminate the extra loads put on processors and I/O adapters by the backup process on the primary host.

A clone database can also serve as a valid backup of the primary database. You can back up the primary database to tape using snapshot volumes.

Figure: Example system configuration for database backup on a secondary host shows a typical configuration when snapshot volumes are used on a secondary host.

Figure: Example system configuration for database backup on a secondary host

Example system configuration for database backup on a secondary host

Prerequisites

  • You must be logged in as the Oracle database administrator to use dbed_vmclonedb command.

  • Before you can use the dbed_vmclonedb command, you must validate a snapplan and create a snapshot.

  • The volume snapshot must contain the entire database.

  • Before you can use the dbed_vmclonedb command with the -r relocate_path option (which specifies the initial mount point for the snapshot image), the system administrator must create the mount point and then change the owner to the Oracle database administrator.

  • In case of mapped mounts, the mapped mount points need to be created by the System Administrator.

Usage Notes

  • The dbed_vmclonedb command can be used on the secondary host.

  • In a same-node configuration, the primary and secondary hosts are the same.

  • In a same-node configuration, -r relocate_path is required if no mapped mounts were specified or some of the mapped mount entries were left blank in the snapplan.

  • If SNAPSHOT_MODE is set to offline or instant, an off-host configuration is required and -r relocate_path is not allowed.

  • See the dbed_vmclonedb(1M) manual page for more information.

More Information

About creating database snapshots

Validating a snapplan (dbed_vmchecksnap)

Creating a snapshot (dbed_vmsnap)

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Example to create a snapshot image of the database PROD Home Mounting the snapshot volumes and backing up