thanks for your explanation, i'll go for the 0% read - 100% write cache. > -----Oorspronkelijk bericht----- > Van: Igor Neyman [SMTP:[EMAIL PROTECTED]] > 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 > [EMAIL PROTECTED] > > > > ----- Original Message ----- > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > 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 <[EMAIL PROTECTED]> > > 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 > > > > > > -- > > Please see the official ORACLE-L FAQ: http://www.orafaq.com > > -- > > Author: > > INET: [EMAIL PROTECTED] > > > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 > > San Diego, California -- Public Internet access / Mailing Lists > > -------------------------------------------------------------------- > > To REMOVE yourself from this mailing list, send an E-Mail message > > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > > the message BODY, include a line containing: UNSUB ORACLE-L > > (or the name of mailing list you want to be removed from). You may > > also send the HELP command for other information (like subscribing). > > > > > > > > -- > > Please see the official ORACLE-L FAQ: http://www.orafaq.com > > -- > > Author: Thomas Day > > INET: [EMAIL PROTECTED] > > > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 > > San Diego, California -- Public Internet access / Mailing Lists > > -------------------------------------------------------------------- > > To REMOVE yourself from this mailing list, send an E-Mail message > > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > > the message BODY, include a line containing: UNSUB ORACLE-L > > (or the name of mailing list you want to be removed from). You may > > also send the HELP command for other information (like subscribing). > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: Igor Neyman > INET: [EMAIL PROTECTED] > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 > San Diego, California -- Public Internet access / Mailing Lists > -------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED]
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