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List:       tomcat-user
Subject:    Re: Problem with too many open db connections on Tomcat
From:       "Claus Hausberger" <CHausberger () gmx ! de>
Date:       2011-04-01 13:56:08
Message-ID: 20110401135608.100630 () gmx ! net
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-------- Original-Nachricht --------
> Datum: Fri, 01 Apr 2011 14:49:56 +0100
> Von: Mark Thomas <markt@apache.org>
> An: Tomcat Users List <users@tomcat.apache.org>
> Betreff: Re: Problem with too many open db connections on Tomcat

> On 01/04/2011 13:38, Claus Hausberger wrote:
> > 
> > -------- Original-Nachricht --------
> > > Datum: Fri, 01 Apr 2011 12:44:28 +0100
> > > Von: Mark Thomas <markt@apache.org>
> > > An: Tomcat Users List <users@tomcat.apache.org>
> > > Betreff: Re: Problem with too many open db connections on Tomcat
> > 
> > > On 01/04/2011 12:36, Claus Hausberger wrote:
> > > > Hello,
> > > > 
> > > > I have a problem with Tomcat and open connections to an Oracle 11g
> > > database.
> > > > 
> > > > I use Tomcat 5.5, DBCP 1.2 and Hibernate 3.3 + Spring for DB
> > > connections.
> > > > For political reasons I can not upgrade to new Tomcat versions at the
> > > moment.
> > > > 
> > > > I have 7 deployed apps on the Tomcat. 4 user a datasource configured
> for
> > > Tomcat itself (in context.xml) with a setting of maxActiv=20. This
> > > datasource is used by Hibernate via JNDI.
> > > 
> > > Which context.xml file? Exactly where is it located?
> > > 
> > > Mark
> > > 
> > 
> > Hi Mark,
> > 
> > the file is in the Tomcat folder under:
> > 
> > conf/context.xml
> > 
> > this is the config:
> > 
> > <Resource name="jdbc/myDS" auth="Container"
> > 	type="javax.sql.DataSource"
> driverClassName="oracle.jdbc.OracleDriver"
> > 	url="jdbc:oracle:thin:@my-oracle-host:mysid" username="xxx"
> > 	password="XXX" maxActive="20" maxIdle="10" maxWait="-1"
> > />
> 
> And there is the problem. conf/context.xml provides the defaults for
> every web application so every context deployed on that instance will
> have a resource as configured as above.
> 
> If you want a shared resource, define it in server.xml and put a
> resource link in conf/context.xml.
> 
> Mark
> 

Hi Mark,

thanks. Do I understand this correctly? If my file (context.xml) defines maxActive=20 \
and I have 4 apps using this, everyone get's it's own 20 connections, making it at \
most 80?

I thought this would be one pool shared by all. 
I will try it as you suggested with server.xml.

best wishes,

Claus




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