Re: cache settings NT

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

--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author:
  INET: GKor_at_rdw.nl

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: ListGuru_at_fatcity.com (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: tday6_at_csc.com

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: ListGuru_at_fatcity.com (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).