VERITAS Storage Foundation 4.1 Oracle Administrator's Guide

Resynchronizing Your Database to the Snapshot Prerelease 8 September 2005, 8:55am
252 VERITAS Storage Foundation for Oracle Administrator’s Guide
Resynchronizing Your Database to the Snapshot
If your database becomes corrupted, you can use reverse resynchronization to recover the database
from a clone. The reverse resynchronization feature of VERITAS Database FlashSnap enables you
to resynchronize the primary database or volume with a clone database or snapshot volume.
Reverse resynchronization requires the primary database to be offline so that it remains unchanged.
Caution Upon completion of reverse resynchronization, the content of the original database is
discarded. Storage Checkpoints taken on either the original database or the clone
database before or after the snapshot was created are discarded. The dbed_vmsnap
-o reverse_resync_commit command cannot be undone and should be used
with extreme caution.
Prerequisites
◆ You must be logged in as the Oracle database administrator.
◆ Before you can reverse resynchronize the snapshot image, you must complete the steps in
“Summary of Database Snapshot Steps” on page 216 and “Creating a Snapshot
(dbed_vmsnap)” on page 235.
◆ The mount point for the primary database must be created by and owned by the Oracle DBA
user before mounting the VxFS file system.
◆ If a clone database has been created, you must shut it down and unmount the file systems using
the dbed_vmclonedb -o umount command before you can reverse resynchronize the
snapshot image. This command also deports the disk group if the primary and secondary hosts
are different. See “Shutting Down the Clone Database and Unmounting File Systems” on
page 248.
◆ The primary database must be offline.
Usage Notes
◆ The dbed_vmsnap command can only be executed on the primary host.
◆ If the Oracle authentication password is used, you need to recreate it using the ORAPWD utility
after executing dbed_vmsnap -o reverse_resync_commit.
Note You cannot access Database FlashSnap commands (dbed_vmchecksnap,
dbed_vmsnap, and dbed_vmclonedb) from the VxDBA menu utility.