Shh!! Nonsense! It's all black magic and conjecture!
How else are we going to be highly paid Oracle consultants, if everyone knows
all this stuff is provable and demonstrable?? ;-)
And in case you miss it in Richard's terse message, one
of the big reasons that it
is not
'rocket science' is that you can perform operations that modify the
index(es),
and perform block dumps of
the index as you go. You can see exactly what Oracle is
doing with the index.
Jared
|
| Yong Huang
<yong321@yahoo.com>
Sent by: ml-errors@fatcity.com
12/09/2003 11:44 AM
Please respond to ORACLE-L
|
To:
Multiple recipients of list ORACLE-L
<ORACLE-L@fatcity.com>
cc:
Subject: Re: rebuilding indexes - sure
to cause a ruckus |
Thanks, Richard. I'll read your long message more
carefully later. I like your
statement that rebuilding an index or not is
not rocket science. One needs to
measure the performance before and after
the rebuild and make a conclusion
himself. Many times we discuss
performance issues and get very technical and
sophisticated, without
showing experimental results! Having been a science
researcher before, I'd
like to emphasize that facts speak louder than theories.
There may be
10,000 24x7 databases in the world that don't easily allow even
testing an
index rebuild. But there may be 100 times more production databases
in the
world that are not 24x7. The individual DBA needs to do his control
study
and conclude, using experts' opinions as reference.
Yong
Huang
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Received on Tue Dec 09 2003 - 16:29:57 CST
