Well, large sort area size would certainly help, as well as the parallel
hints.
As for the bitmap index, I din't know what was the percentage. It probably
wouldn't
help much.
--
Mladen Gogala
Oracle DBA
> -----Original Message-----
> From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On
> Behalf Of rgaffuri_at_cox.net
> Sent: Wednesday, September 17, 2003 1:25 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: RE: tuning a massive delete
>
>
> i tested the minus in the explain plan and the estimate was
> very large. dont i need a large sort_area_size for that?
>
> bitmap index on all columns right? not just one?
> >
> > From: "Mladen Gogala" <mladen_at_wangtrading.com>
> > Date: 2003/09/17 Wed PM 12:59:40 EDT
> > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > Subject: RE: tuning a massive delete
> >
> > How abuout:
> > create table ani_prx_new parallel (degree 5) nologging
> > as
> > ( select * from ani_prx
> > minus
> > select * from from bo_owner.ani_prx
> > where ba_recode='V')
> > /
> >
> > I assume that the description of the bo_owner.ani_prx is identical
> > to the description of the ani_prx. Furthermore, a bitmap index on
> > ba_owner.ani_prx(ba_recode) would speed things up quite a bit under
> > favorable circumstances.
> >
> > --
> > Mladen Gogala
> > Oracle DBA
> >
> >
> >
> > > -----Original Message-----
> > > From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On
> > > Behalf Of rgaffuri_at_cox.net
> > > Sent: Wednesday, September 17, 2003 11:45 AM
> > > To: Multiple recipients of list ORACLE-L
> > > Subject: tuning a massive delete
> > >
> > >
> > > i have a table with 27 million records that is about 1.2 GB
> > > in size. I have a 'staging table' with 18 million records. 16
> > > million records have a 'delete' flag. I have indexed the
> > > column in staging with a delete flag. both tables have
> > > indexed primary keys. Is the following my fastest option or
> > > would an 'IN' be faster? Im concerned because this has been
> > > running for a while and have alot of consistent gets but no
> > > 'writes' yet which tells me its still building the join. Our
> > > sort_area_size is rather small and Im not allowed to change
> > > it which tells me we are swapping to the temp tablespace.
> > >
> > > anyway to speed this up? or is this the fastest we got?
> > >
> > >
> > > create table ani_prx_new parallel (degree 5) nologging
> > > as select *
> > > from ani_prx b
> > > where not exists (select 1 from bo_owner_stage.ani_prx a
> > > where ba_reccode = 'V' and a.cusip = b.cusip and a.fund_no =
> > > b.fund_no and a.add_cymd = b.add_cymd)
> > >
> > > --
> > > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > > --
> > > Author: <rgaffuri_at_cox.net
> > > INET: rgaffuri_at_cox.net
> > >
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Note:
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Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Mladen Gogala
INET: mladen_at_wangtrading.com
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
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Received on Wed Sep 17 2003 - 13:19:40 CDT
