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List:       tomcat-user
Subject:    Re: Problem with too many open db connections on Tomcat
From:       Mark Thomas <markt () apache ! org>
Date:       2011-04-01 13:58:25
Message-ID: 4D95DA01.9040502 () apache ! org
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On 01/04/2011 14:56, Claus Hausberger wrote:
> 
> -------- 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?

Correct.

> I thought this would be one pool shared by all. 

Nope.

> I will try it as you suggested with server.xml.

That should fix it.

Mark



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