> "Jamadagni, Rajendra" wrote:
>
> Thanks Jonathan,
>
> I'd like to assign the tables to a group, but need to do that
> periodically. Also what I do is load all tables that belong to a group
> in a pl/sql table (bulk updates/bulk collects). That's why I don't
> want to do read-from-table ... do-action
>
> BTW this doesn't have to be optimal ... I am just trying to split the
> load ...
>
> 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: Jonathan Lewis [mailto:[EMAIL PROTECTED]
> Sent: Thursday, March 06, 2003 12:44 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: Tricky SQL Question
>
> 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:
> Cost Based Optimisation
> Trouble-shooting and Tuning
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> (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
Raj,
I have taken good note that 'elegant' is not one of your
requirements :-).
select decode(sign(8 - mod(rownum - 1, 14)),
1, mod(rownum - 1, 14),
7 - mod(rownum - 1, 7)) "GROUP",
x.owner,
x.name
from (select owner, name
from your_table
order by ana_tm desc) x;
This should more or less work, even on 7.2.
--
Regards,
Stephane Faroult
Oriole Software
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