Thanks for the info Robert.
Personally, I usually have more urgent matters to deal with that preclude
worrying about a possible 10meg wasted in a rollback segment. ;)
Jared
"Freeman, Robert " <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
03/15/02 11:23 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: RE: A rollback segment question on minextents
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:[EMAIL PROTECTED]]
> 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
>
>
> --- [EMAIL PROTECTED] 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:[EMAIL PROTECTED]]
> > > Sent: 07 March 2002 20:54
> > > To: Multiple recipients of list ORACLE-L
> > > Subject: Re: A rollback segment question on minextents
> > >
> > > [EMAIL PROTECTED] 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
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