Thanks Steven,
I believe Tom touched on this in his discussion at recent Hotsos conference. My requirements were slightly different, but the logic is still good for me.
Thanks
Raj
-------------------------------------------------------------
Rajendra dot Jamadagni at espn dot com
Any views expressed here are strictly personal.
QOTD: Any clod can have facts, having an opinion is an art !!
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 06, 2003 4:45 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Tricky SQL Question
Raj,
I may not be offering information useful in solving your specific stats
problem. If that's the case, Undskyld. However, this information is
certainly useful.
This link to the asktom website contains a method for dividing up large
tables into ranges of rowids so that multiple sessions can efficiently
process different pieces of the same object.
Last month, I had the opportunity to see Mr. Kyte demonstrate this during
one of his presentations.
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:7638743750722
-Steve
-----Original Message-----
Sent: Thursday, March 06, 2003 11:44 AM
To: Multiple recipients of list ORACLE-L
Thinking back to university days, I think this
was called the knapsack problem, and at the
time there was no algorithm guaranteed to
give an optimal solution.
If there is no simple non-procedural algorithm -
how about a strategy that simply allows each
slave to take the longest task that has not yet
been run until there are no jobs left to run ?
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
Coming soon one-day tutorials:
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Trouble-shooting and Tuning
Indexing Strategies
(see http://www.jlcomp.demon.co.uk/tutorial.html )
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----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: 06 March 2003 16:49
> Hi all,
>
> I have a tricky situation ... I have a table
>
> columns are
> owner varchar2(),
> name varchar2(),
> ana_tm number
>
> ana_tm represents how much time it took to perform statistics
collection for
> owner.name value. the number ranges from 0 to about 12000 right now,
and is
> subject to change. and say sum(ana_tm) over the table is say X.
>
> What I'd like to have is split this data into say N groups (Let's
say 8),
> so that each group ends up having a sum(ana_tm) ~ X/N (i.e. X/8 in
this
> example).
>
> What I need is a way in SQL to splice the table list in eight groups
so that
> when I run a parallel 8 stream analyze, they all roughly take same
amount of
> time. I tried width_bucket() and it doesn't give me things that I
need. It
> assumes a linear distribution, which I do not have.
>
> Is this possible to do in SQL only?
>
> Thanks in advance, yes, you can go crazy with syntax, it is 9202.
> Raj
> -------------------------------------------------------------
> Rajendra dot Jamadagni at espn dot com
> Any views expressed here are strictly personal.
> QOTD: Any clod can have facts, having an opinion is an art !!
>
>
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