You could probably mount a argument about more than
505 extents (for an 8k block) not being able to fit in
the segment header block - but unless you're
clobbering dba_extents and the like with queries, I
doubt you'd ever see a difference.
hth
connor
- Steve Smith <ssmith_at_ai.com> wrote: > Yea - I keep
hearing and seeing tests that show that
> the number of extents
> had no bearing on performance (up to a point). It
> just 'bothers' me to see
> a 500 or 1200 or 2000 extents on a table.. <grin>
>
> Here is a question - is there any situation that
> having only 1 big extent
> would reduce performance?
>
> Steve
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L"
> <ORACLE-L_at_fatcity.com>
> Sent: Tuesday, October 02, 2001 10:30 AM
>
>
> > well, only when you are deleting massive amounts
> of data or truncating
> > with drop storage.. then there is an impact
> because of the hits on the
> > dictionary tables.
> >
> > but basically yes... I've been told by various
> Oracle employees that up
> > to 4096 extents cause no problem whatsoever.
> >
> >
> > --- Christopher Spence <cspence_at_FuelSpot.com>
> wrote:
> > > That is completely a myth. There is no notable
> performance different
> > > with a
> > > table with 10,000 extents and one with 1.
> > >
> > > The only problem is when it comes to the bitmaps
> when dealing with
> > > LMT and
> > > cluster when dealing with dictionary managed.
> When you query the
> > > extent
> > > views, or do space management type processes.
> > >
> > > "Do not criticize someone until you walked a
> mile in their shoes,
> > > that way
> > > when you criticize them, you are a mile a way
> and have their shoes."
> > >
> > > Christopher R. Spence
> > > Oracle DBA
> > > Phone: (978) 322-5744
> > > Fax: (707) 885-2275
> > >
> > > Fuelspot
> > > 73 Princeton Street
> > > North, Chelmsford 01863
> > >
> > >
> > >
> > > -----Original Message-----
> > > Sent: Monday, October 01, 2001 7:15 PM
> > > To: Multiple recipients of list ORACLE-L
> > >
> > > May be it is good practice to keep number of
> extents to be less than
> > > 50, no
> > > matter what the size of extent.
> > >
> > >
> > >
> > > -----Original Message-----
> > > Sent: Monday, October 01, 2001 3:35 PM
> > > To: Multiple recipients of list ORACLE-L
> > >
> > >
> > > Hello,
> > >
> > > I'll do an reorganization of a database (about
> 140 gigs). Some people
> > > say
> > > that it'd be good to use 128K, 4M and 128M
> extents. I saw somewhere
> > > it'd be
> > > 160K, 4M and 160M. Which size do you advice me ?
> I have also many
> > > small
> > > indexes (less than 16K).
> > >
> > > Regards,
> > >
> > > Thanh-truc Nguyen
> > >
> > > --
> > > Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> > > --
> > > Author: Thanh-truc Nguyen
> > > INET: truc_at_nguyen.as
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=== message truncated ===
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Received on Tue Oct 02 2001 - 15:50:45 CDT
