RE: cache settings NT

thanks for your explanation, i'll go for the 0% read - 100% write cache.

> -----Oorspronkelijk bericht-----
> Van: Igor Neyman [SMTP:ineyman_at_perceptron.com]
> Verzonden: vrijdag 6 september 2002 22:43
> Aan: Multiple recipients of list ORACLE-L
> Onderwerp: Re: cache settings NT
>
> That's why you use write cache only if it's "battery supported". Then it
> should be safe.
>
> Igor Neyman, OCP DBA
> ineyman_at_perceptron.com
>
>
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Friday, September 06, 2002 2:28 PM
>
>
> >
> > I'll take a shot at this.
> >
> > Don't have any write caching. Oracle may think that it has safely
> > committed the transactions and they are written to disk when they are in
> > fact only in cache. If the machine were to shut down ungracefully,
> i.e.,
> > someone kicks out the plug, then your database would not be in a
> consistent
> > state. Granted, the odds are small, but is it worth the risk? If the
> > database is archived and you don't mind the increased chance of having
> to
> > do a recovery then I would say 0% read - 100% write. Oracle is doing
> it's
> > own read caching in the SGA and it's unlikely that the disk cache will
> > correctly anticipate Oracle's read requirements. Therefore, caching on
> the
> > read side is only likely to increase IO. Write caching does not lead to
> > any increased IO but it does have some small risk of producing an
> > inconsistent database.
> >
> >
> >
> > GKor
> > @rdw.nl To: Multiple recipients of
> list ORACLE-L <ORACLE-L_at_fatcity.com>
> > Sent by: root cc:
> > Subject: cache settings NT
> >
> > 09/06/2002
> > 04:18 AM
> > Please
> > respond to
> > ORACLE-L
> >
> >
> >
> >
> >
> >
> > Hi all
> >
> > I have the following question for you :
> >
> > what are the preferred values for the several cache settings on the
> fysical
> > disk units (NT W2K)
> >
> > e.g. 100 % read cache - 0 % write cache
> > 50% read cache - 50% write cache
> >
> > is there a difference between settings for an OLTP or DSS solution.
> >
> > etc
> >
> > anyone with an explanation
> >
> > vr. gr.
> > g.g. kor
> > rdw ict groningen
> >
> >
> > --
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> > Author:
> > INET: GKor_at_rdw.nl
> >
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> Author: Igor Neyman
> INET: ineyman_at_perceptron.com
>
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-- 
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-- 
Author: 
  INET: GKor_at_rdw.nl

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