Re: Tuning RMAN backup and recovery
- From: "Greg Rahn" <greg@xxxxxxxxxxxxxxxxxx>
- To: don@xxxxxxxxx
- Date: Mon, 3 Mar 2008 11:05:34 -0800
On 3/3/08, Don Seiler <don@xxxxxxxxx> wrote:
> I've read a couple blog posts that say to gather fixed object stats
> weekly, during normal business hours. Another page [0] also suggested
> gathering dictionary stats as part of the same weekly process.
>
> Anyone have any thoughts?
>
> Don.
>
> [0]
> http://www.toadworld.com/Community/ExpertsBlog/tabid/67/EntryID/135/Default.aspx
>
>
> On Mon, Mar 3, 2008 at 9:39 AM, Don Seiler <don@xxxxxxxxx> 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
Optimizer
http://www.oracle.com/technology/products/bi/db/10g/pdf/twp_bidw_optimizer_10gr2_0208.pdf
This is discussed on page 7 & 8 (Statistics on Dictionary Tables &
Statistics on Fixed Objects)
--
Regards,
Greg Rahn
http://structureddata.org
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