Re: Tuning RMAN backup and recovery
Date: Tue, 4 Mar 2008 08:32:41 -0600
Taking away the following juicy nuggest:
- "Statistics on the dictionary tables will be maintained via the automatic statistics gathering job run during the nightly maintance window."
- "You only need to gather fixed objects statistics once for a representative workload and they are not updated by the automatic statistics gathering job."
Answers both my questions.
On Mon, Mar 3, 2008 at 1:05 PM, Greg Rahn <greg_at_structureddata.org> wrote:
> On 3/3/08, Don Seiler <don_at_seiler.us> wrote:
> > I've read a couple blog posts that say to gather fixed object stats
> > weekly, during normal business hours. Another page  also suggested
> > gathering dictionary stats as part of the same weekly process.
> > Anyone have any thoughts?
> > Don.
> >  http://www.toadworld.com/Community/ExpertsBlog/tabid/67/EntryID/135/Default.aspx
> > On Mon, Mar 3, 2008 at 9:39 AM, Don Seiler <don_at_seiler.us> wrote:
> > > I did have some follow-up questions regarding
> > > DBMS_STATS.GATHER_FIXED_OBJECT_STATS().
> > >
> > > 1. We had noticed that, since gathering the fixed object stats, the
> > > time needed to perform a level 0 incremental backup dropped by around
> > > 40%. Is this not a coincidence?
> > >
> > > 2. Is there any schedule or milestone upon which one should re-gather
> > > fixed object statistics?
> I would recommend that you check out
> Upgrading from Oracle Database 9i to 10g: What to expect from the
> This is discussed on page 7 & 8 (Statistics on Dictionary Tables &
> Statistics on Fixed Objects)
> Greg Rahn
-- Don Seiler http://seilerwerks.wordpress.com ultimate: http://www.mufc.us -- http://www.freelists.org/webpage/oracle-lReceived on Tue Mar 04 2008 - 08:32:41 CST