Return-Path: Received: from ensim.rackshack.net (root@localhost) by orafaq.net (8.11.6/8.11.6) with ESMTP id h78DiBD25090 for ; Fri, 8 Aug 2003 08:44:11 -0500 X-ClientAddr: 66.27.56.212 Received: from www3.fatcity.com (rrcs-west-66-27-56-212.biz.rr.com [66.27.56.212]) by ensim.rackshack.net (8.11.6/8.11.6) with ESMTP id h78DiAp25085 for ; Fri, 8 Aug 2003 08:44:11 -0500 Received: (from root@localhost) by www3.fatcity.com (8.11.6/8.11.6) id h78BKWh16913 for oracle-l@orafaq.net; Fri, 8 Aug 2003 04:20:32 -0700 Received: by fatcity.com (05-Jun-2003/v1.0g-b73/bab) via fatcity.com id 005C9A21; Fri, 08 Aug 2003 04:15:03 -0800 Message-ID: Date: Fri, 08 Aug 2003 04:15:03 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: "Tanel Poder" Sender: ml-errors@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: "Tanel Poder" Subject: Re: Multiple Datafiles and performance? Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 73; ListGuru (c) 1996-2003 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Note that in previous mail, my reply starts from 2nd paragraph, the first one wasn't indented correctly for some reason.. Tanel. ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" Sent: Friday, August 08, 2003 2:59 PM > > As for the datafiles and indexfiles being distributed over different > physical disks, well I can not confirm you are wrong, in our site id DID > boost the performance, and specially if you locate in separate physical > drives your redologs and datafiles (both indexes or data). Of course it > depends on the server's work load and how many people are simultaneously > accesing data and indexes. I can understand what you say but if many > different users are accesing the same table via indexes and both the table's > data and the indexes are on the same physical drive I think performance > should be worst than if they were separated, right or wrong? ... > > Wrong, because in multi-user environment, disk reading heads will never be > physically be in same place where you "left" them. (Well, almost never, > depending on your IO queue length). > > Are you comparing oranges with oranges here - if you got one disk in your > server and get performance boost by buying another disk in and putting some > files (doesn't matter which files) on new disk, then you are comparing 1 > disk vs. 2 disks, and that doesn't have anything to do with the type of > segments in the files. > > Tanel. > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Tanel Poder > INET: tanel.poder.003@mail.ee > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: ListGuru@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.net -- Author: Tanel Poder INET: tanel.poder.003@mail.ee Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@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).