Sounds like a perfect candidate for a bitmapped index...
drop it before updating and create it after...
one table scan then after that the rest is done in memory...
> -----Original Message-----
> From: Jeffery Stevenson [SMTP:jeff_at_mpv.com]
> Sent: Wednesday, October 25, 2000 11:35 AM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Re[2]: Re[2]:Upgrading Oracle
>
> Sounds like the tables will be having too many updates/inserts to make
> bitmap indexes feasible. She could possibly split the table up and then
> create a view to map it back to the way the application expects to see it
> (even using INSTEAD-OF triggers to map inserts and updates properly).
> Well,
> she'll figure something out. :)
>
> Jeff
>
> -----Original Message-----
> Sent: Wednesday, October 25, 2000 10:20 AM
> To: Multiple recipients of list ORACLE-L
>
>
> Rachael,
>
> Why can't you create indexes on these columns?
> (offhand they sound like candidates for bitmapped
> indexes)
>
> Matt
>
> ----
> R. Matt Adams - GE Appliances - matt.adams_at_appl.ge.com
> No electrons were harmed in the making of this e-mail.
>
>
>
> > -----Original Message-----
> > From: Rachel Carmichael [mailto:carmichr_at_hotmail.com]
> > Sent: Wednesday, October 25, 2000 12:06 AM
> > To: Multiple recipients of list ORACLE-L
> > Subject: Re: Re[2]: Re[2]:Upgrading Oracle
> >
> >
> >
> > oh that was minor compared to today's rant... a third party
> > product that
> > denormalizes tables because their "experts" told them that if
> > you have more
> > than 4 tables in a join performance suffers significantly.
> >
> > So instead of a parent table with a child table that contains
> > one row for
> > each option selected, I have ONE table with a column for
> > every possible
> > option, and a Y/N switch for each one. AND just to make it even more
> > interesting, if you want to add a new option, the product
> > automatically adds
> > a new column to the table. We expect to have something like
> > 5-15 million
> > rows in that table. And we will do selections for mass emails
> > based on each
> > of those columns. Which I can't index, so we will do multiple
> > full table
> > scans on a table way too large to pin into the buffer pool.
> >
> > I managed not to foam at the mouth. And made sure that
> > EVERYONE in that
> > meeting knew that I thought that this design was going to
> > cause us major
> > performance problems that I could not necessarily do DBA
> > magic to remove.
> > Sigh......
> >
> > Rachel
> >
> > >From: dgoulet_at_vicr.com
> > >To: "Rachel Carmichael" <carmichr_at_hotmail.com>,
> > Multiple recipients
> > >of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > >Subject: Re[2]: Re[2]:Upgrading Oracle
> > >Date: Tue, 24 Oct 2000 18:35:20 -0400
> > >
> > >Nice to see I can still get a rise out of you. Cheers!!
> > >
> > >Dick Goulet
> >
> > ______________________________________________________________
> > ___________
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Rachel Carmichael
> INET: carmichr_at_hotmail.com
>
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> Author: Adams, Matthew (GEA, 088130)
> INET: MATT.ADAMS_at_APPL.GE.COM
>
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> Author: Jeffery Stevenson
> INET: jeff_at_mpv.com
>
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Received on Wed Oct 25 2000 - 11:55:38 CDT
