Oops, sorry for the mis-attribution, and my unintended slight on
the author of 'Oracle Unleashed'
Jared
"Cary Millsap" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
09/10/2002 02:23 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: RE: Misinformation Ranting
I feel your pain. You got the publisher right, but it's not "Oracle
Unleashed." It's from p109 of the best-selling but utterly reprehensible
"Oracle Performance Tuning Tips & Techniques" book.
Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
Upcoming events:
- Hotsos Clinic, Oct 1-3 San Francisco, Oct 15-17 Dallas, Dec 9-11
Honolulu
- 2003 Hotsos Symposium on OracleR System Performance, Feb 9-12 Dallas
- Next event: Miracle Database Forum, Sep 20-22 Middelfart Denmark
-----Original Message-----
[EMAIL PROTECTED]
Sent: Tuesday, September 10, 2002 3:29 PM
To: Multiple recipients of list ORACLE-L
<RANT>
I've just spent 30 minutes with our SAP administrator trying to
convince her that we really don't need to reorganize the tables
in our production SAP database.
Due to some misinformation in an Oracle Press book, 'Oracle Unleashed'
I think, she is equating number of extents with fragmentation.
The text she referred me to is in fact discussing 'migrated rows' though
that term is never used. She has become convinced that if the
extents allocated for tables are not all in contigous space, some
very nasty fragmentation will occur.
I tried taking it down to disk and explaining that an OLTP system with
hundreds of users won't really see much benefit from this, but she
wasn't really ready for that. :)
Her concern is that there are 29000 extents in an index tablespace.
This might have something to do with there being 3400 indexes in
said tablespace.
Total 'wasted' ( honeycomb ) space in this 250 gig DB is < 20 meg. Not
much to gain there.
The text of the book states that you should expect a '10 to 20 percent
performance increase' by reorganizing the tables/indexes. No data to
back it up of course.
This is on a database that performs very well most of the time, outside
of a couple of custom reports that run too long. No complaints from
users about slowness.
Arrghhh!
I just had to vent to the list, cuz there's no one here that
understands.
<\RANT>
Jared
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