That is the 1st problem that I mentioned (too many I/Os because Oracle
doesn't use an index for example).
Anjo.
Christian Trassens wrote:
> Or Oracle is choosing an awful index. Check the
> execution plan.
>
> Regards.
> --- Robertson Lee - lerobe <lerobe_at_acxiom.co.uk>
> wrote:
> > Not my solution, just something I was meaning to
> > try.
> >
> > -----Original Message-----
> > Sent: 25 February 2002 11:18
> > To: Multiple recipients of list ORACLE-L
> >
> >
> >
> > Performance problems with db file sequential read
> > can happen for two
> > reasons:
> > 1) you are doing too many I/O
> > 2) each I/O is too slow (now there can many reaons
> > why I/O is slow).
> >
> > So your solution of going with the INDEX_FFS hint is
> > too reduce the number
> > of
> > I/O. Well what if the problem is that the I/O is too
> > slow ?
> >
> > Anjo Kolk
> >
> > http://www.oraperf.com
> >
> >
> > Robertson Lee - lerobe wrote:
> >
> > > All,
> > >
> > > Oracle 8.0.5.0.0 Tru64 4.0f
> > >
> > > We are having a performance issue with one of our
> > applications and it
> > looks
> > > like it is pointing to the db file sequential
> > reads event. I have been
> > doing
> > > some digging around and a recommendation in a book
> > I have has suggested a
> > > possible way to alleviate this is to use the
> > INDEX_FFS hint in the query.
> > > Anyone used this before ??. or indeed any other
> > recommendations where I
> > > should be looking.
> > >
> > > Regards
> > >
> > > Lee
> > >
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> > > --
> > > Author: Robertson Lee - lerobe
> > > INET: lerobe_at_acxiom.co.uk
> > >
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> >
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> =====
> Ing. Christian Trassens
> Senior DBA & Unix Administrator
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Anjo Kolk
INET: anjo_at_oraperf.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
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Received on Mon Feb 25 2002 - 09:08:26 CST
