16 million of the 18 million records in the staging table have delete records. how would indexing help there? wouldnt a full table scan be better?
>
> 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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>
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> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Mladen Gogala
> INET: mladen_at_wangtrading.com
>
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INET: rgaffuri_at_cox.net
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Received on Wed Sep 17 2003 - 12:24:49 CDT
