Re: RMAN Backup timing question
Date: Thu, 3 Jan 2008 08:43:48 -0800 (PST)
On Jan 3, 4:36 pm, zigzag..._at_yahoo.com wrote:
> On Jan 2, 11:44 pm, DA Morgan <damor..._at_psoug.org> wrote:
> > zigzag..._at_yahoo.com wrote:
> > > On Jan 2, 5:52 pm, hpuxrac <johnbhur..._at_sbcglobal.net> wrote:
> > >> On Jan 2, 5:32 pm, zigzag..._at_yahoo.com wrote:
> > >>> I have a database, I did level 0 backup using RAMN, let us say it took
> > >>> t1 minutes.
> > >>> Now I deleted lot of data in database using delete staements (as part
> > >>> of some application archiving process). I do level 0 backup again.
> > >>> Will time taken now be roughly same as t1 or lot less because many
> > >>> blocks are "empty".
> > >>> Thanks.
> > >> What version of oracle?
> > >> If you just "delete rows" but haven't truncated tables releasing
> > >> extents or dropped tables ... then the blocks aren't exactly empty are
> > >> they? They may not contain rows but that's a different story.
> > > Thanks. This was a general question. I have versions from 8.1.6 to
> > > 10.2 running on Widnows and HP UNIX.
> > It will be different in the different versions. Read the docs:http://tahiti.oracle.com
> > But be aware that 8.1.6 is so old the docs are no longer online. Look
> > at the 8.1.7 docs and hopefully they are similar.
> > --
> > Daniel A. Morgan
> > Oracle Ace Director & Instructor
> > University of Washington
> > damor..._at_x.washington.edu (replace x with u to respond)
> > Puget Sound Oracle Users Groupwww.psoug.org-Hide quoted text -
> > - Show quoted text -
> I think in Oracle10g with compression option, backup times shold
> reduce, oher versions timing will be same.
I don't know the specifics about each version by heart, but it goes something like this:
9i -> RMAN skips blocks that have NEVER been formatted
10g -> it skips all unused blocks (even if they have been formatted
and were used earlier)
8i -> I don't care ;) Received on Thu Jan 03 2008 - 10:43:48 CST