Re: Hot Backup - Need for Rollback Segs
Date: 1995/08/11
Message-ID: <808130534snz_at_jlcomp.demon.co.uk>#1/1
In article <40dai4$1hl_at_engineer.mrg.uswest.com>
LNudelm_at_unotes1.mnet.uswest.com "Larry Nudelman" writes:
: I can't see restoring a RB tablespace from
Recovery works by applying physical changes to the database files
that have been recorded in the (archived) redo logs. The final stage
to the recovery is to reverse out the changes which are due to
transactions that have not been committed, i.e. to use the rollback
segments to roll back some of the changes applied during recovery.
That is why you have to backup and recover the rollback segments.
: The rbs tablespace is about one-fourth the size of the entire database
: the hot back up if the OS file gets hit.
:
: and space. Any comments on if I can / should exclude them.
:
It is possible that this rather extreme size is a hang-up from Version 6 days. If you are on Version 7, you may find that you can take advantage of the 'optimal size' feature of rollback segments to reduce the total filesize needed.
-- Jonathan LewisReceived on Fri Aug 11 1995 - 00:00:00 CEST