problem with dbcp and database restart

[me...@assetmanagement.natexis.fr]

hi all,

I have a problem with my configured datasource using dbcp. 
I have posted this question to tomcat user list in vain...
Maybe some struts user could help.

I've configured my dbcp connection pool  in Tomcat 4.1.18
server.xml file.

here is an extract of it
<ResourceParams name="jdbc/intranetMail">
 <parameter><name>username</name><value>XXXXXXX</value></parameter>
 <parameter><name>password</name><value>XXXXXXX</value></parameter>
            <parameter><name>driverClassName</name>
              <value>com.sybase.jdbc2.jdbc.SybDriver</value></parameter>
            <parameter><name>url</name>
 <value>jdbc:sybase:Tds:s198000SGD1:5000/intranet_mail</value></parameter> 
 
            <parameter>
              <name>removeAbandoned</name>
              <value>true</value>
            </parameter>
            <parameter>
              <name>removeAbandonedTimeout</name>
              <value>60</value>
            </parameter>
Everything works fine. But
when our database server is restarted, I have to restart Tomcat
in order to aquire connection to my defined pool.

I wonder if there is a manner to avoid restarting Tomcat when
the database server is restarted.

I have added the parameters below to my pool config.

            <parameter>
              <name>removeAbandoned</name>
              <value>true</value>
            </parameter>
            <parameter>
              <name>removeAbandonedTimeout</name>
              <value>60</value>
            </parameter>
 
 I recognize ,I've added that quite blindly. 
 Can someone confirm me if this is a cure to my problem ?
 
 any suggestion is greatly appreciated.
 
 
 Meissa 

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Re: problem with dbcp and database restart

[Dan Tran <da...@hotmail.com>]

Meissa,

When your database restarts, all your dbcp connections (in the pool) become
staled connection.

In order to resolve this problem, dbcp needs to do a ping to database server
to make the connection is still up before giving to your app.

Looking into dbcp configuration doc, it should have a param you can setup
(something like QueryString) where
it should be a select statement to a database table.  You many need to setup
a dummy table just for this purpose.

Hope this helps.

-Dan
----- Original Message ----- 
From: <me...@assetmanagement.natexis.fr>
To: <st...@jakarta.apache.org>
Sent: Wednesday, July 09, 2003 7:36 AM
Subject: problem with dbcp and database restart


>
> hi all,
>
> I have a problem with my configured datasource using dbcp.
> I have posted this question to tomcat user list in vain...
> Maybe some struts user could help.
>
> I've configured my dbcp connection pool  in Tomcat 4.1.18
> server.xml file.
>
> here is an extract of it
> <ResourceParams name="jdbc/intranetMail">
>  <parameter><name>username</name><value>XXXXXXX</value></parameter>
>  <parameter><name>password</name><value>XXXXXXX</value></parameter>
>             <parameter><name>driverClassName</name>
>               <value>com.sybase.jdbc2.jdbc.SybDriver</value></parameter>
>             <parameter><name>url</name>
>  <value>jdbc:sybase:Tds:s198000SGD1:5000/intranet_mail</value></parameter>
>
>             <parameter>
>               <name>removeAbandoned</name>
>               <value>true</value>
>             </parameter>
>             <parameter>
>               <name>removeAbandonedTimeout</name>
>               <value>60</value>
>             </parameter>
> Everything works fine. But
> when our database server is restarted, I have to restart Tomcat
> in order to aquire connection to my defined pool.
>
> I wonder if there is a manner to avoid restarting Tomcat when
> the database server is restarted.
>
> I have added the parameters below to my pool config.
>
>             <parameter>
>               <name>removeAbandoned</name>
>               <value>true</value>
>             </parameter>
>             <parameter>
>               <name>removeAbandonedTimeout</name>
>               <value>60</value>
>             </parameter>
>
>  I recognize ,I've added that quite blindly.
>  Can someone confirm me if this is a cure to my problem ?
>
>  any suggestion is greatly appreciated.
>
>
>  Meissa
>
> L'integrite de ce message n'etant pas assuree sur internet, Natexis
> Banques Populaires ne peut etre tenu responsable de
> son contenu. Toute utilisation ou diffusion non autorisee est
> interdite. Si vous n'etes pas destinataire de ce message, merci de le
> detruire et d'avertir l'expediteur.
>
> The integrity of this message cannot be guaranteed
> on the Internet. Natexis Banques Populaires can not therefore be
> considered responsible for the contents.Any unauthorized use or
dissemination is prohibited.
> If you are not the intended recipient of this message, then please delete
it and
> notify the sender.

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