Connection Pooling

[Karim Zibari <kz...@yahoo.com>]

Hi

I have been using this connection pooling declaration for my web app for many months but I never really know
what it is doing:

           
        <Resource name="jdbc/JSNDB" auth="Container" type="javax.sql.DataSource"
              maxActive="50" maxIdle="30" maxWait="10000"
              removeAbandoned="true" removeAbandonedTimeout="10" logAbandoned="true"
              username="root" password="letmein2006" driverClassName="com.mysql.jdbc.Driver"
                url="jdbc:mysql://localhost:3306/kurdishglobe_net?autoReconnect=true"/>

Specifically, 
1- does this mean that 50 connections will be made available when the web app is loaded?
2- what happens if all the 50 connections are used up and there are more db connection requests?
3- what about the maxIdle="30"; there cannot be more than 30 idle connections ?  
 
Best regards
Karim Zibari


 
____________________________________________________________________________________
Yahoo! Music Unlimited
Access over 1 million songs.
http://music.yahoo.com/unlimited

Re: Connection Pooling

[David Smith <dn...@cornell.edu>]

With maxWait=10000, I believe on pool exhaustion, it'll wait for up to
10 seconds for one to become available.  Failing that, I'm not sure. 
The request might get a null connection back or an exception.  Honestly
I've never looked at the internals of DBCP, but I have done some
programming work on commons-pool which came from the DBCP project.

--David

Karim Zibari wrote:

>Hi
>
>I have been using this connection pooling declaration for my web app for many months but I never really know
>what it is doing:
>
>           
>        <Resource name="jdbc/JSNDB" auth="Container" type="javax.sql.DataSource"
>              maxActive="50" maxIdle="30" maxWait="10000"
>              removeAbandoned="true" removeAbandonedTimeout="10" logAbandoned="true"
>              username="root" password="letmein2006" driverClassName="com.mysql.jdbc.Driver"
>                url="jdbc:mysql://localhost:3306/kurdishglobe_net?autoReconnect=true"/>
>
>Specifically, 
>1- does this mean that 50 connections will be made available when the web app is loaded?
>2- what happens if all the 50 connections are used up and there are more db connection requests?
>3- what about the maxIdle="30"; there cannot be more than 30 idle connections ?  
> 
>Best regards
>Karim Zibari
>
>
> 
>____________________________________________________________________________________
>Yahoo! Music Unlimited
>Access over 1 million songs.
>http://music.yahoo.com/unlimited
>  
>


-- 
=======================================
David Smith
Network Operations Supervisor
Department of Entomology
College of Agriculture & Life Sciences
Cornell University
2132 Comstock Hall
Ithaca, NY  14853
Phone: 607.255.9571
Fax: 607.255.0939


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