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Product: Storage Foundation for Databases Guides | |
Manual: Storage Foundation 4.1 for Oracle Administrator's Guide |
Summary of Database Snapshot StepsYou can use Database FlashSnap commands to create a snapshot of your entire database on the same host or on a different one. Three types of snapshots can be created: online, offline, or instant. If the SNAPSHOT_MODE specified in the snapplan is set to online, dbed_vmsnap first puts the tablespaces to be snapshot into backup mode. After the snapshot is created, the tablespaces are taken out of backup mode, the log files are switched to ensure that the extra redo logs are archived, and a snapshot of the archive logs is created. If the SNAPSHOT_MODE is set to offline, the database must be shut down before the snapshot is created. Online redo logs and control files are required and will be used to ensure a full database recovery. If the SNAPSHOT_MODE is set to instant, tablespaces are not put into and out of backup mode. Online redo logs and control files are required and will be used to ensure a full database recovery. Both online and offline snapshots provide a valid backup copy of the database. You can use the snapshot as a source for backing up the database or creating a clone database for decision-support purposes. Instant snapshots do not represent a valid backup copy for point-in-time recovery. The sections that follow explain how to create snapshots of all volumes on a database using the snapplan. Optionally, you can use the VxVM command (vxsnap) to create volume snapshots. However, unlike the Database FlashSnap commands, the vxsnap command does not automate disk group content reorganization functions. For more information about the vxsnap command, see VERITAS Volume Manager Administrator's Guide. ![]() ![]() ![]()
The following flow chart depicts the sequence of steps leading up to taking a snapshot using Database FlashSnap. Prerequisites for Creating a Snapshot of your Database Click the thumbnail above to view full-sized image. There are many actions you can take after creating a snapshot of your database using Database FlashSnap. You can create a clone of the database for backup and off-host processing purposes. You can resynchronize the snapshot volumes with the primary database. In the event of primary database failure, you can recover it by reverse resynchronizing the snapshot volumes. The following flow chart depicts the actions you can perform after creating a snapshot of your database using Database FlashSnap. Actions you can perform after Creating a Snapshot of your Database Click the thumbnail above to view full-sized image. |
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Product: Storage Foundation for Databases Guides | |
Manual: Storage Foundation 4.1 for Oracle Administrator's Guide | |
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