John,
You are right, I just find out note 1029850.6 on
metalink : "A block is relinked to a free list if
after DELETE or UPDATE operations, the percentage of
the used space falls below PCTUSED."
- John.Hallas_at_vodafone.co.uk a écrit : > Well I was
sure about it until you had the temerity
> to question me :)
> I think we agree on extents sizes not being changed
> after the event so it is
> now a discussion on whether changes to a
> pctfree/pctused are retrospective.
>
> I contend that if a table is fully loaded upto its
> pctfree/pctused limits
> and there are no available blocks on the freelist
> then by changing the
> pctfree/pctused values no additional blocks will
> suddenly appear on the
> freelist.
> I do agree however that if a block is amended by
> having a row deleted or a
> row updated then the new values come into play and
> the blockcould then be
> available on the freelist.
>
> I think I am correct on this but as with anything I
> am always ready to be
> proved wrong - it has happened before and wil
> lhappen may times in the
> future
>
> John
>
>
> -----Original Message-----
> Sent: 24 September 2002 15:47
> To: ORACLE-L_at_fatcity.com; John.Hallas_at_vodafone.co.uk
>
>
>
> Are you sure about that John?
>
> On Tuesday 24 September 2002 04:28,
> John.Hallas_at_vodafone.co.uk wrote:
> > No, it is not retrospective.
> > You are setting parameters to be used when the
> next extent is created.
> > A better example is when setting next extent size
> to be different than the
> > existing extent size (dictionary managed
> tablespaces only).
> > It does not alter all the existing extents it only
> works on the next one
> > that is created.
> >
> > HTH
> >
> > John
> >
> > -----Original Message-----
> > Sent: 24 September 2002 10:58
> > To: Multiple recipients of list ORACLE-L
> >
> >
> >
> > Is the effect of modifying PCTFREE/PCTUSED
> immediate ?
> >
> >
> > If I do an "ALTER TABLE <tablename> PCTFREE 99
> PCTUSED1",
> > does this take effect immediately, even for
> existing blocks.
> > [If so, existing blocks would not get new rows
> inserted].
> > Or is it effective only in new Extents ? In that
> case,
> > existing blocks in existing Extents still use the
> old
> > PCTFREE/PCTUSED parameters and keep re-entering
> the
> > FreeList.
> >
> > Hemant K Chitale
> > http://hkchital.tripod.com
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> --
> Author:
> INET: John.Hallas_at_vodafone.co.uk
>
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Received on Tue Sep 24 2002 - 16:28:32 CDT
