RE: Why we should use bind variables when we write code......
- From: "Reidy, Ron" <Ron.Reidy@xxxxxxxxxxxxxxxxxx>
- To: <Mark.Bobak@xxxxxxxxxxxxxxx>, "oracle-l" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 19 Sep 2006 09:31:48 -0600
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_Valu
es). 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@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] 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,
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