RE: When to use bulk bind?

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Thu, 01 May 2003 11:31:41 -0800
Message-ID: <F001.0058DA6C.20030501113141@fatcity.com>

No rule of thumb (if you are doing something in a loop, see if you could *bulk* the operation), but for an example code like this

for I in array.first .. array.last
loop
  update some_table

     set some_column = array(i).value
   where other_column = array(i).column; end loop;

You'd benefit from using a bulk bind with FORALL.

forall i in array.first array.last
update some_table

   set some_column = array(i).value
 where other_column = array(i).column;

Syntax might change based on what version you are on ... but this should give you some idea.
It depends on your processing of data.

Raj

---

---

Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

-----Original Message-----
Sent: Thursday, May 01, 2003 2:57 PM
To: Multiple recipients of list ORACLE-L

We have a batch process that does a long series of updates, inserts, and deletes. Right now we are using a script to execute sql.

When is it appropriate to move this to PL/SQL and use array processing? couple of things I thought of...

1. We have one large table that has a column with 5-6 distinct values. We are often doing

select stuff
from big_table
where column = 'BLAH'

Would it be a good idea to bulk collect the rowids or even just select the entire row into a pl/sql table? and essentially break the table up into 5 smaller tables?

then do a forall statement to do my update?

In general when should you move from update, insert,delete statements with sub-queries to array processing? anyone have any rules of thumb?

--

Please see the official ORACLE-L FAQ: http://www.orafaq.net
--

Author: <rgaffuri_at_cox.net
  INET: rgaffuri_at_cox.net

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------

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.net
--

Author: Jamadagni, Rajendra
  INET: Rajendra.Jamadagni_at_espn.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------

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 Thu May 01 2003 - 14:31:41 CDT