RE: JBoss keeps sending select 'hello' from dual
- From: <Jay.Miller@xxxxxxxxxxxxxxxx>
- To: <jkstill@xxxxxxxxx>
- Date: Tue, 28 Oct 2008 15:17:04 -0400
Well, what we tried was swapping out
<check-valid-connection-sql >select 'hello' from dual
</check-valid-connection-sql >
for
<!--valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.
vendor.OracleValidConnectionChecker</valid-connection-checker-class-name
-->
However that seems to generate an equal number of
select 'x' from dual
statements so I don't know that we've gained very much. Anyone have
other suggestions?
Jay Miller
Sr. Oracle DBA
201.369.8355
________________________________
From: Jared Still [mailto:jkstill@xxxxxxxxx]
Sent: Thursday, October 23, 2008 6:10 PM
To: Miller, Jay
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: JBoss keeps sending select 'hello' from dual
Don't keep us in suspense like that.
What was it?
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
On Thu, Oct 23, 2008 at 1:47 PM, <Jay.Miller@xxxxxxxxxxxxxxxx> wrote:
Never mind.
I tried some different search terms in Google after sending this
out and
think I've found the answer. Sorry about that.
Jay Miller
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of
Jay.Miller@xxxxxxxxxxxxxxxx
Sent: Thursday, October 23, 2008 4:34 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: JBoss keeps sending select 'hello' from dual
While investigating some performance issues on two unrelated
databases
one of the odd things we found was a huge number of "select
'hello' from
dual"
statements hitting the databases (as in over a million/hour).
Further investigation leads us to believe that this is a
standard
feature of JBoss connection pooling and the method it uses to
check if a
connection is still alive but we couldn't find any real details
on it.
Just wondering if anyone else has encountered this before and
can point
me to additional information or any way of reducing its impact.
Thanks,
Jay Miller
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