Jon,
Thanks for the email. My next question is fairly obvious...I'm getting a
"lot" of waits on this latch (up to 5% of all waits) - how do I tune it ?
(We've got a pretty typical environment here, a few big tables with parallel
degree 4, on a 2 cpu box with 2G of RAM, and only a couple of end users
doing big queries)...
Any guidelines (from anybody) would be much appreciated...
TIA
Ben
>From: "Jon Walthour" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
>Subject: RE: Latch 'parallel query qref latch'
>Date: Thu, 14 Jun 2001 13:01:56 -0800
>
>
>
>Ben:
>
>The qref latch is obtained for each Parallel Query process. It
>is acquired before the queue buffers can be manipulated so that
>communication can take place between the various slave processes.
>The latch is acquired for putting messages into the buffer. You
>will generally see lots of misses for this latch since it is
>acquired with a nowait option.
>
>Jon Walthour, OCDBA
>Oracle DBA
>Computer Horizons
>Cincinnati, Ohio
>
> >--- Original Message ---
> >From: "Ben Jones" <[EMAIL PROTECTED]>
> >To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
> >Date: 6/14/01 1:56:36 PM
> >
>
> >Does anyone know what causes waits on this latch ?
> >
> >Thanks
> >Ben
> >_________________________________________________________________________
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_________________________________________________________________________
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