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RE: Why we should use bind variables when we write code......

Reidy, Ron

2006-09-19

Replies:
Why we should use bind variables when we write code......

Mark,

 

I can’t comment on Java, but for Perl, look at the DBD::Oracle documentation (http://search.cpan.org/~timb/DBI-1.52/DBI.pm#Placeholders_and_Bind_Values).  For Python, look at this http://www.oracle.com/technology/pub/articles/devlin-python-oracle.html

 

Hope this is a help.

 

--

Ron Reidy

Lead DBA

Array BioPharma, Inc.

 


From: oracle-l-bounce@freelists.org [mailto:oracle-l-bounce@freelists.org] On Behalf Of Bobak, Mark
Sent: Tuesday, September 19, 2006 8:37 AM
To: oracle-l
Subject: Why we should use bind variables when we write code......

 

So, last week, one of my instances starts getting ORA-4031s, and after a few minutes, comes crashing down when a background process (lmd0, I think it was) catches an ORA-4031.  So, with the instance down, it's a bit tough to see what happened.  So, we start things up again, and I start watching closely over the next few days.  Seems there's lots of code that doesn't bother with binds.  In some cases, there are a dozen non-sharable SQLs that are identical except for literals, in other cases, up to hundreds.  (Thanks to T.Kyte for the script that I'm using to identify non-sharable SQL.)  After a few days, I find the smoking gun.  One single SQL statement that has 3,424 copies that are identical except for literals.  (No, that's not a typo.)  This is taking up abour 75% of the 475M of shared pool that's dedicated to the sql area.  One single SQL statement, 75%.  Yikes!

So, now I'm on an education kick.  "This is the way we do things when we don't want to kill the Oracle database server!"

So, my question is, is there a resource, online or otherwise,  that has examples of proper bind variable usage in various languages?  I can cover C/Pro*C, PL/SQL, SQL*Plus, but what about Java, Perl, Python, etc,etc?  I'm not much of a coder lately, and I want proper examples that can be shown to developers, in whatever is the language of choice.

Thanks,

-Mark

--
Mark J. Bobak
Senior Oracle Architect
ProQuest Information & Learning

"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects."   --Robert A. Heinlein

 


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