you aren't wrong :)
- "Freeman, Robert " <Robert_Freeman_at_csx.com> wrote:
> Actually the rollback segment header in the first extent exists in a
> single
> block, the rest of the first extent, as I understand it, is available
> for
> undo. Thus making INITIAL and NEXT the same should be of no
> consequence in
> this regard.
>
> It is my understanding (and I'm sure I will be corrected if I'm
> wrong) the
> reason for a requirement of 2 extents is to allow the tail/wrap
> architecture
> that Oracle uses for rollback segments.
>
> RF
>
> Robert G. Freeman - Oracle8i OCP
> Oracle DBA Technical Lead
> CSX Midtier Database Administration
>
> The Cigarette Smoking Man: Anyone who can appease a man's conscience
> can
> take his freedom away from him.
>
>
>
> -----Original Message-----
> Sent: Friday, March 15, 2002 12:54 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Oracle recommends the size NEXT=INITIAL.
> So if I had 10M initial, then most of the initial beyond the
> header info will be wasted? Sure not!
>
> Kumanan
>
> > -----Original Message-----
> > From: Rachel Carmichael [SMTP:wisernet100_at_yahoo.com]
> > Sent: 11 March 2002 21:48
> > To: Multiple recipients of list ORACLE-L
> > Subject: RE: A rollback segment question on minextents
> >
> > the first extent is used by oracle as the segment header to manage
> the
> > transaction information within the rollback segment. The second
> extent
> > contains the actual change vectors
> >
> >
> > --- kumanan.balasundaram_at_qxl.com wrote:
> > > Hi,
> > >
> > > My point was that it could allocate one more extent as per need.
> Why
> > > the
> > > need to minextents = 2?
> > >
> > > Thanks
> > > Kumanan
> > >
> > > > -----Original Message-----
> > > > From: Stephane Faroult [SMTP:sfaroult_at_oriole.com]
> > > > Sent: 07 March 2002 20:54
> > > > To: Multiple recipients of list ORACLE-L
> > > > Subject: Re: A rollback segment question on minextents
> > > >
> > > > kumanan.balasundaram_at_qxl.com wrote:
> > > > >
> > > > > Hi,
> > > > >
> > > > > I was wondering why Oracle force minextents for rollback
> > > > > segments to be two. Why can't we have minextents zero or
> > > > > no minextents clause at all.
> > > > >
> > > > > We can surely set initial extent to be large enough ourselves
> > > > > and next extent sized accordingly.
> > > > >
> > > > > Can someone enlighten me on the reason/thought behind this?
> > > > >
> > > > > Many thanks
> > > > >
> > > > > Kumanan Balasundaram
> > > > > Database Administrator, IT
> > > > > QXL ricardo plc
> > > > > www.qxl.com
> > > > > P: +44 (0)208 962 7409
> > > >
> > > > Oracle doesn't reuse an extent which contains active
> transactions.
> > > What
> > > > do you think would happen when you reach the end of your
> initial
> > > extent
> > > > ? Exactly.
> > > > --
> > > > Regards,
> > > >
> > > > Stephane Faroult
> > > > Oriole Ltd
> > > > --
> > > > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > > > --
> > > > Author: Stephane Faroult
> > > > INET: sfaroult_at_oriole.com
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> Author: Freeman, Robert
> INET: Robert_Freeman_at_csx.com
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Received on Fri Mar 15 2002 - 14:53:33 CST
