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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Received on Mon Mar 11 2002 - 15:48:23 CST
