What happens when you join a large parllelized table
with a very small table (contained in just 10 or 12
blocks) the retrieval of rows from the large table
looks up the small table causing buffer busy waits on
the blocks of the small table. Keeping the small table
in keep pool removes the buffer busy waits.
- "Koivu, Lisa" <lisa.koivu_at_efairfield.com> wrote:
> I thought that parallel query slaves were smart
> enough to divide up the work
> between them so there was no overlap? What am I
> missing? Can you
> elaborate?
>
> > -----Original Message-----
> > From: Johnson Poovathummoottil
> [SMTP:joni_65_at_yahoo.com]
> > Sent: Tuesday, August 21, 2001 11:21
> > To: Multiple recipients of list ORACLE-L
> > Subject: RE: Freelist Contention
> >
> > Bufer busy waits can also be caused by parallel
> query
> > servers trying to read the same buffer block at
> the
> > same time. So does it always indicate a freelist
> > problem?
> > .
> > --- Jon Walthour <jonw_at_fuse.net> wrote:
> > > Raja:
> > >
> > > You will know you have freelist contention if
> you
> > > have a significant
> > > buffer busy waits ratio (>5%).
> > >
> > > Jon Walthour
> > >
> > > -----Original Message-----
> > > Luthra
> > > Sent: Monday, August 20, 2001 11:45 PM
> > > To: Multiple recipients of list ORACLE-L
> > >
> > >
> > > Hello folks,
> > >
> > > How do I come to know that there is a contention
> > > going on in the
> > > freelists? Is there any v$ table or this type of
> > > contention you derive
> > > from some other info. like a ripple effect from
> some
> > > parameter?
> > >
> > > TIA.
> > >
> > > raja
> > >
> > >
> > > Get 250 color business cards for FREE!
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> > > Author: Viraj Luthra
> > > INET: viraj999_at_lycos.com
> > >
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INET: joni_65_at_yahoo.com
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Received on Tue Aug 21 2001 - 13:47:43 CDT
