RE: pl/sql is INTERPRETED?

> From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Connor
> McDonald
> Sent: Tuesday, April 30, 2002 4:03 AM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: pl/sql is INTERPRETED?
>
>
> Saw some basic demo's at a BMC/Simulus seminar
> revealed that compiled units were certainly faster
> than their interpreted counterparts - I can't remember
> off hand but it was in the order of 20-30% maybe? Of
> course, typically the main performance problems with
> PL/SQL are:
>
> a) poor SQL within the code
> b) inefficient (ie row at a time) handling of the
> results

It's sometimes surprising to people just how big a difference things like this can make. As an example, a couple of weeks ago I was asked to look at some poor performing PL/SQL. The packaged procedure in question declared a cursor as a simple select of all rows and columns (~60 or so) from some table. A cursor for loop was then used to read each row and insert into a table -- row at a time processing. The process inserted 6.9 million rows and took 1 hour 9 minutes (I commented out the commit every 5,000 rows logic ;-) ). Ripped out the procedural logic and changed to a simple INSERT INTO TABLEA (....) SELECT ... FROM TABLEB. The process completed in 6 minutes. Didn't have the chance to get timings on an insert append.

>
> neither of which I believe native compilation will
> help with greatly.
>
> hth
> connor
>

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Larry Elkins
  INET: elkinsl_at_flash.net

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).