John,
>> You seem to be one of those lucky DBAs who don't have performance issues
:)
This is just one of the 150 databases. A DBA needs performance issues,
backup failures, disk failures, 600 errors, dropped tables, et all, to
justify wages above the minimum wages law ;-)
Raj
John Kanagaraj
<john.kanagara To: Multiple recipients of list ORACLE-L
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Sent by: Subject: RE: In an Analyze Necessary?
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om
May 03, 2002
06:23 PM
Please respond
to ORACLE-L
Rajesh,
You seem to be one of those lucky DBAs who don't have performance issues :)
Just keep in mind that when statistics are NOT present and the CBO is
forced
by one of the many reasons, some defaults will be assumed. These defaults
are absolutely invalid and incorrect. So, even if you analyze once, these
stats will remain and provide the CBO with a picture which is more or less
correct (unless your data is really skewed).
Rather than completely switch off stats collection, why don't you look at
what's the difference between that stats between one weekend's ANALYZE and
the next? If the changes are not significant, then you may choose to
perform
this only once a quarter or so....
One of the myths with Stats collection is 'Analyze everyday!', but the
truth
is 'it all depends'.
John Kanagaraj
Oracle Applications DBA
DBSoft Inc
(W): 408-970-7002
The manuals for Oracle are here: http://tahiti.oracle.com
The manual for Life is here: http://www.gospelcom.net
** The opinions and statements above are entirely my own and not those of
my
employer or clients **
> But, me thinks, I will go ahead and disable that once a week
> analyze cron
> job. The CPU can be better utilized for the other night batch jobs.
> > A datawarehouse. There are only a few selected SQL's run
> against this
> > database. And all this SQL's are tuned to optimum during design with
> hints
> > embedded to take the least execution time. The SQL's
> currently execute
> in
> > times, much better than what the expected response time was
> by the users.
> > Would it still be required to analyze the tables? What
> other benefits
> would
> > one reap from an analyze? Assume that there are no other
> SQL's running
> > against the database other than this select few, and the data in the
> > underlying tables has been accounted for a period of 2 years during
> design.
> > Any new SQL's which would need to be added would go thru the drawing
> board.
> > Absolutely Nothing adhoc.
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