RE: OFA myths was Re: BAARF

Oh man... now I see the problem.

Well, IMHO, Kevin's advice is the right advice for the wrong reasons. It's not the OFA.

Thanks, Jacques, for pointing that out.

Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com

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-----Original Message-----
Jacques Kilchoer
Sent: Monday, September 29, 2003 6:15 PM To: Multiple recipients of list ORACLE-L

Not commenting on the accuracy of the information, but Kevin Loney, in the Oracle8 DBA Handbook (1998), says the following (Chapter 3 Logical Database Layouts), in a section entitled "The Optimal Flexible Architecture (OFA)"
"Index segments should not be stored in the same tablespace as their associated tables, since they have a great deal of concurreint I/O during both manipulation and queries. Index segments are also subject to fragmentation due to improper sizing or unpredicted table growth. Isolating the application indexes to a separate tablespace greatly reduces the administrative efforts involved in defragmenting either the DATA or the INDEXES tablespace."

>From reading his book, I always thought that OFA implied the separation
of tables and indexes.

> -----Original Message-----
> From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com]On Behalf Of
> Steve Rospo
> Sent: jeudi, 25. septembre 2003 15:10
>
> I'd like to get rid of the myth that OFA really states all
> that much about
> what goes in what tablespace etc. I've got a copy of the
> Cary's OFA paper
> entitled "The OFA Standard - Oracle7 for Open Systems" dated Sept 24,
> 1995. (Happy belated birthday OFA!) At the end of paper
> there's a summary
> of the requirements and the recommendations that make up OFA.
> The CLOSEST
> the OFA comes to specifying table/index separation are
>
> "#7 Separate groups of segments with different lifespans, I/O request
> demands, and backup frequencies among different tablespaces."
>
> -or maybe-
>
> "#11 *IF* [emphasis mine] you can afford enough hardware
> that: 1) You can
> guarantee that each disk drive will contain database files
> from exactly
> one application and 2) You can dedicate sufficiently many
> drives to each
> database to ensure that there will be no I/O bottleneck."
>
> The document itself says, "The OFA Standard is a set of configuration
> guidelines that will give you faster, more reliable Oracle
> database that
> require less work to maintain." So every time I read that someone is
> putting redo here, index tablespaces here, and temp
> tablespaces there in
> order to be "OFA compliant" I kinda shrug. Obviously it's
> all a good idea
> to separate this stuff but it's not absolutely required for OFA-ness.
> Essentially, OFA is just a very good way of separating Oracle
> code from
> Oracle data to make administration *much* easier. I'm sure before OFA
> there were plenty of places that had everything under
> $ORACLE_HOME/dbs and
> no naming standard for datafiles. Ugh!
>
> Now if we could only find this "Cary V. Millsap, Oracle Corporation"
> character so he could explain himself. ;-) '95 was a
> loooooong time ago.

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-- 
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-- 
Author: Cary Millsap
  INET: cary.millsap_at_hotsos.com

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