<sympathy>
I can't tell you how many times I've tried to explain to more junior DBAs
that number of extents doesn't matter anymore.
Then they'll point me to some official looking book where it says, "They do
too matter."
What's embarrassing is that for a time part of being a good DBA was
figuring out your INITIAL and NEXT so that you got only 1 or 2 extents per
table or index. But that whole issue is now so 2nd millennium.
</sympathy>
Jared.Still
@radisys.com To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
Sent by: root cc:
Subject: OT: Misinformation Ranting
09/10/2002
04:28 PM
Please
respond to
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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