Rick,
I'd suggest:
SELECT <table1_field1_name>, <table1_field2_name> BULK COLLECT INTO v_array,
c_array
FROM <table1_name>
WHERE ...
then do 'for all':
FORALL nJ IN 1..v_array.COUNT
UPDATE <table2_name>
SET <table2_field1_name> = v_array(nJ)
WHERE <table2_field2_name> = c_array(nJ);
Igor Neyman, OCP DBA
[EMAIL PROTECTED]
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: Monday, February 04, 2002 1:15 PM
> Hi DBAs
>
> Here are 2 scenario's. Which one is more efficient?
> Assume 10,000 records to update
>
> Thanks
> Rick
>
> 1. For each record update field1 with subsquery
> Assume cursor is declared
> FOR cursor_rec IN new_patients_cur LOOP
> UPDATE <table>
> SET field1 =
> (SELECT value
> FROM table
> WHERE ...)
> WHERE ....
> END LOOP;
>
> 2. For each record load nested table with data then update all records
with
> a single FORALL
>
> t_type1 IS TABLE OF table1.field1%TYPE;
> v_type1 t_type1(10000);
>
> /* Load the PLSQL nested table */
> FOR cursor_rec IN new_patients_cur LOOP
> v_loop_ctr := v_loop_ctr + 1;
> v_type1 := cursor_rec.field1;
> END LOOP;
>
> /* INSERT all 10,000 records with on context switch */
> FORALL v_count IN 1...10000)
> UPDATE field1 = v_type1(v_count);
>
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author:
> INET: [EMAIL PROTECTED]
>
> 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: [EMAIL PROTECTED] (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: Igor Neyman
INET: [EMAIL PROTECTED]
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: [EMAIL PROTECTED] (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).
