Re: what is the fastest way to update a big table with more than

Thanks all who replied and helped me.
I did just as you said.
first i created new tables with char(8) totids by trimming during table creation. This way eliminating trim function solved my problem, though still not that fast. Each process needs nearly 2 hours. I already updated 10columns and still have 3 more to go.
thanks again to everyone.
cheers :)
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, October 31, 2001 11:35 PM

> When you create the new table with char(8), I would use varchar2(8) but,
do
> a trim when inserting into the new table because in your old
> table since it is char(255) it is blank padded so you are trying to put
> length of 255 into a length of 8.
>
> HTH
> Rick
>
> -----Original Message-----
> Sent: Wednesday, October 31, 2001 8:50 AM
> To: Multiple recipients of list ORACLE-L
>
>
> thanks Mercadante,
> actually i have to use trim() function because the type of join.totid
> (varchar2(255) and type of cs.totid (char(255) are different.So when i
> compare those two values
> my program can never find an equal value.I tried to change both of htem to
> char(8) , but i am having an error message saying that it can't be changed
> when the table is not empty. When i try to create new table with a totid
of
> char(8), then i ama having "two large data " error message. Any idea how
to
> avoid that?
> cheers :)
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Wednesday, October 31, 2001 9:00 PM
>
>
> > yilmaz,
> >
> > First of all, your query is probably performing a full table scan on
each
> > table because of your use of the TRIM function.
> > Remove this.
> >
> > Secondly, why join the two tables together? Just query the table with
the
> > newer data in a loop, and update the older table like this:
> >
> > declare
> > cursor c1 is
> > select j.totid, j.source from join j where j.source is
> not
> > null;
> > tot join.TOTID%type;--totid is the primary key for both
> tables
> > src cs.source%type;--source is the column to be updated
> > begin
> > open c1;
> > loop
> > fetch c1 into tot,src;
> > exit when c1%notfound;
> > update cs set source=src where totid=tot;
> > end loop;
> > commit;
> > close c1;
> > end;
> >
> > Hope this helps.
> >
> > Tom Mercadante
> > Oracle Certified Professional
> >
> >
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: yilmaz
> INET: yilmaz_at_hwajet.com.tw
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Cale, Rick T (Richard)
> INET: RICHARD.T.CALE_at_saic.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
>

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: yilmaz
  INET: yilmaz_at_hwajet.com.tw

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).