Oracle FAQ | Your Portal to the Oracle Knowledge Grid |
![]() |
![]() |
Home -> Community -> Mailing Lists -> Oracle-L -> Re: How to do faster updates
Pillai, Rajesh wrote:
> Hi All,
> I've a table of 10 M records and I want to update some thousand records based on a column which is not a part of any index. Please suggest the quickest way to do this.
>
> Thanks,
> Rajesh
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Pillai, Rajesh
> INET: Rajesh.Pillai_at_nordstrom.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).
Bulk collect the rowid's of the rows you want to update. Then use the forall statement to bulk update the rows. Very, very fast.
Here is an example:
set serveroutput on size 1000000
declare
type my_array_type is table of rowid index by binary_integer; my_array my_array_type; rows natural := 15000; loop_count pls_integer := 0; -- -- cursor bill_cur is select b.rowid from bill b where b.person_id = 'xyz'; begin open bill_cur; loop fetch bill_cur bulk collect into my_array limit rows; exit when bill_cur%NOTFOUND; loop_count := loop_count + 1; forall indx in my_array.first..my_array.last update bill set person_id = 'abc' where ROWID = my_array(indx); commit; my_array.DELETE; end loop; --- if my_array.COUNT > 0 then forall indx in my_array.first..my_array.last update bill set person_id = 'abc' where ROWID = my_array(indx); commit; end if; close bill_cur; dbms_application_info.set_client_info( Total Loops: '|| loop_count ); exception when others then commit;
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jeff Landers INET: jlanders_at_convergys.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).Received on Fri Sep 13 2002 - 13:58:22 CDT
![]() |
![]() |