DB connections from oc4j app

Hi!
I'd like to verify if our app (configured by other company) is configured properly.
We should handle 2000-4000 of users, and I was told that each user uses db connection.
In oc4j data-sources.xml I have:
<data-source name="WebAppDataSource" location="jdbc/core/WebAppDataSource" class="com.evermind.sql.DriverManagerDataSource" ejb-location="jdbc/WebAppDataSource" xa-location="jdbc/xa/WebAppDataSource" pooled-location="jdbc/pool/WebAppDataSource" connection-driver="oracle.jdbc.driver.OracleDriver" username="app_portal" url="jdbc:oracle:thin:@10.10.10.4:1521:mydb" min-connections="50" max-connections="500" password="portal_03" inactivity-timeout="60" wait-timeout="10"/></data-sources>
So - at startup (currently 20 processes of oc4j) i got 1000 db connections (and 1000 db processes), but on heavy load (>1000 clients on the same time) it raises to more than 100 conns. per process. A lot of...
In addition our app was configured to use connection pooling (to reduce db coonections amount), and in oc4j.properties we have:
oracle.home=/u01/oas10g
jbo.ampool.initpoolsize=100
jbo.ampool.maxpoolsize=300
jbo.recyclethreshold=250
jbo.ampool.maxavailablesize=250
jbo.ampool.minavailablesize=250
jbo.ampool.maxinactiveage=1500
jbo.dofailover=true
jbo.maxpoolsize=300
jbo.doconnectionpooling=true
Could someone tell me whether using such config files makes any sense?
Regards
Rafal

In my experience I think you would want to have a managed data source setup to allow the application server to manage the pool. Based on the data-source.xml you provided, this doesn't look like it is configured for that.
also the driver class to use for a pooled data source should be: oracle.jdbc.pool.OracleDataSource
I would think it should be structured like:
<?xml version = '1.0' encoding = 'UTF-8'?>
<data-sources>
<managed-data-source connection-pool-name="Pool_WebAppDataSource" jndi-name="WebAppDataSource" name="WebAppDataSource"/>
<managed-data-source connection-pool-name="Pool_WebAppDataSource" jndi-name="jdbc/core/WebAppDataSource" name="jdbc/core/WebAppDataSource" />
<managed-data-source connection-pool-name="Pool_WebAppDataSource" jndi-name="jdbc/WebAppDataSource" name="jdbc/WebAppDataSource" />
<managed-data-source connection-pool-name="Pool_WebAppDataSource" jndi-name="jdbc/xa/WebAppDataSource" name="jdbc/xa/WebAppDataSource" />
<connection-pool name="Pool_WebAppDataSource" connection-retry-interval="0" inactivity-timeout="60" wait-timeout="10" min-connections="50" max-connections="500" property-check-interval="30" validate-connection="true" validate-connection-statement="select 1 from dual">
<connection-factory factory-class="oracle.jdbc.pool.OracleDataSource" username="app_portal" password="portal_03" url="jdbc:oracle:thin:@10.10.10.4:1521:mydb" />
</connection-pool>
</data-sources>

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