I have found the TSM fastback information in the help online about
oracle database backup. I confused the concept of oracle consistency. In
the help info, it show the guideline like below. It look like oracle
database will not in consistency mode before snapshot. In my opinion I
think the database should be switched back to normal mode after snapshot
beginning. That mean it should be done by using post-snapshot instead of
pre-snapshot. Any idea please suggest.
In order to perform consistent application-aware snapshots, the
following steps must be performed:
1.Oracle databases should be notified and switched to work in backup
mode (this operation results in database consistency), by implementing
the pre consistency process described below.
2. Once a snapshot is initiated, Oracle databases should be switched
back to normal mode, using the pre snapshot process described.
3. After the snapshot ends, create and use a post snapshot process to
delete all Archived Redo logs of the backed up database
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