Re: Re: max parallel query

i dont manage the netapp and am not a hardware person. could you explain a little better? Is netapp similiar to SAN?

what is asynch I/O?
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Thursday, September 18, 2003 6:24 PM

> Ryan
> You are probably bottlenecking on the NetApp. Probably your network
link
> to it. If you have some "regular" (a.k.a. direct attached) disk available,
> consider using it for your redo logs.
>
> Dennis Williams
> DBA, 80%OCP, 100% DBA
> Lifetouch, Inc.
> dwilliams_at_lifetouch.com
>
>
> -----Original Message-----
> Sent: Thursday, September 18, 2003 4:45 PM
> To: Multiple recipients of list ORACLE-L
>
>
> hmmm... when i run statspack during a big load. most of my waits are from
> redo log waits and read from a staging datafile. we have all of our
> datafiles on the same I/O mount. We are using a Network Appliance back end
> with asynch I/O.
>
> are you telling me that putting these files on seperate mount points will
> have no effect? I dont quite follow asynch I/O. I dont have much of a hard
> ware OS background.
>
> I cant find any docs or articles on how to tune Parallel Operations. All I
> see are basic syntax. Do you know of any?
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Thursday, September 18, 2003 5:24 PM
>
>
> > If you want rules of thumb, then take CPU_COUNT+1 up to CPU_COUNT *2.
> >
> > I think LIO & PIO ratio is irrelevant, the most important is whether you
> are
> > able to construct optimal parallel execution plan, e.g. avoid excessive
> > parallel slave messaging & waiting. This is mostly design and SQL issue.
> >
> > The number mount points is irrelevant novadays as well IMHO, especially
> when
> > you're using async IO, SANs & SAME like architecture. The only thing
what
> > comes into my mind where splitting into mount points (thus different
file
> > systems) helps performance wise, is that with more file systems you got
> more
> > file system locks and you can spread contention for these locks that
way.
> >
> > Tanel.
> >
> > ----- Original Message -----
> > To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> > Sent: Thursday, September 18, 2003 9:34 PM
> >
> >
> > > i know there are no magic formulas, but im hoping for something better
> > than trial and error. i would assume that parallel query helps most
when:
> > >
> > > 1. are doing work off of multiple mount points.
> > > 2. Have alot more LIOs to perform than PIOs(such as sorts).
> > >
> > > am i close on this?
> > > >
> > > > From: "M Rafiq" <rafiq9857_at_hotmail.com>
> > > > Date: 2003/09/18 Thu PM 01:34:44 EDT
> > > > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > > > Subject: Re: max parallel query
> > > >
> > > > Tanel,
> > > > You are right. There is a param parallel_automatic(I don't remember
> > exact
> > > > name as I don't have access to database) which should be set to true
> and
> > let
> > > > system decide how many pq slave to be used. For max_parallel_server
> > default
> > > > is 5 and can be set to higher number which memory and cpu can
> handle.
> > It
> > > > is faster because it uses all system resources at a given time.
> > > >
> > > > Rarallel process can be used for large batch jobs during off-peak
> time.
> > > >
> > > > Regards
> > > > Rafiq
> > > >
> > > >
> > > > Reply-To: ORACLE-L_at_fatcity.com
> > > > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > > > Date: Thu, 18 Sep 2003 08:39:44 -0800
> > > >
> > > > There is no simple magic formula how many parallel slaves you should
> > have.
> > > > It all depends on your CPU and IO utilization. Yes, utilization,
> because
> > if
> > > > your CPUs or IO are running at their limits already, you won't
benefit
> > from
> > > > parallel execution at all. In fact PX may make the situation even
> worse,
> > > > because it's designed to give you the results the fastest way, not
the
> > most
> > > > efficient way.
> > > >
> > > > Tanel.
> > > >
> > > > ----- Original Message -----
> > > > To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> > > > Sent: Thursday, September 18, 2003 6:15 PM
> > > >
> > > >
> > > > > We run multiple instances on the same server. My understanding is
> > > > max_parallel_servers should be set to 4 x CPU. We have 4 CPUs which
> > means
> > > > 16.
> > > > >
> > > > > however, does this take into account multiple instances on the
same
> > > > server?
> > > > >
> > > > >
> > > > > --
> > > > > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > > > > --
> > > > > Author: <rgaffuri_at_cox.net
> > > > > INET: rgaffuri_at_cox.net
> > > > >
> > > > > Fat City Network Services -- 858-538-5051
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> > > > Author: Tanel Poder
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> > Author: Tanel Poder
> > INET: tanel.poder.003_at_mail.ee
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> Author: Ryan
> INET: rgaffuri_at_cox.net
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> Author: DENNIS WILLIAMS
> INET: DWILLIAMS_at_LIFETOUCH.COM
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Author: Ryan
  INET: rgaffuri_at_cox.net

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