ok, thanks for your explanation. > -----Oorspronkelijk bericht----- > Van: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]] > Verzonden: dinsdag 23 oktober 2001 17:50 > Aan: Multiple recipients of list ORACLE-L > Onderwerp: Re[2]: os block size versus oracle bock size > > WHOA, No that is not a performance problem. The Oracle block size needs > to > always be a multiple of the OS block size. Most operating systems today, > W2K > being no exception, do not simply read the number of OS blocks that you > request. > They always 'read ahead' in the anticipation that you'll want that data > in the > very near future. The amount of read ahead that is done is OS specific. > Therefore if your Oracle block size is <= the OS block size the operating > system > will be doing a lot of reading for you that is irrelevant, which can lead > to a > phantom performance problem namely your wasting OS reads. The idea here > is to > pick an Oracle block size that is appropriate for your application and a > multiple of the OS block size. Also set db_file_multiblock_read_count > carefully > since this controls the number of blocks that Oracle requests from the OS > at one > time. If you need one block and have db_file_multiblock_read_count set to > 100, > then you get 100 blocks, if the OS allows. > > Dick Goulet > > ____________________Reply Separator____________________ > Author: [EMAIL PROTECTED] > Date: 10/23/2001 7:05 AM > > > Hi > > > I'd say yes. For every Oracle block read the OS has to read two block > which > causes overhead. > > > Jack > > > > > [EMAIL PROTECTED]@fatcity.com on 23-10-2001 16:05:21 > > Please respond to [EMAIL PROTECTED] > > Sent by: [EMAIL PROTECTED] > > > To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > cc: (bcc: Jack van Zanen/nlzanen1/External/MEY/NL) > > hi all > > we have an oracle block size of 8k and i believe our W2K server has a > default > os block size of 4k. > Is this a problem with the performance ? > > thanks > > > 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). 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A copy of > these terms and conditions is available on request free of charge. > ===================================================================== > > > > > > -- > 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: > 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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