Veritas Storage Foundation™ for Oracle 5.0.1 Administrator's Guide

Remove the volume plexes for vxdbavol and ORACLE_HOME.

# vxplex -g diskgroup -o rm dis plex_name

$ /opt/VRTS/bin/dbed_vmchecksnap -S ORACLE_SID -H ORACLE_HOME \

-f SNAPPLAN -o validate

Summary of database snapshot steps

You 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_vmsnapfirst

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.

By using Database FlashSnap commands, you can 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.

249Using Database FlashSnap for backup and off-host processing

Summary of database snapshot steps