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From Clinton Begin <clinton.be...@gmail.com>
Subject Re: Oracle v$session and iBatis
Date Wed, 29 Apr 2009 15:20:51 GMT
In my opinion, this was more of an Oracle question than an iBATIS question.
 iBATIS SimpleDataSource doesn't do anything special.  It opens and closes
connections based on how many you tell it to keep alive, using the driver
you specify.  It has no idea what a v$session view is, nor do I.  The driver
and the database are more important to consider.
To Larry's point:  You're using volunteer supported software.  If you don't
like it, you have the option of paying Oracle $5800 / CPU for TopLink.
 Larry's cheaper though, if you want to hire him.  ;-)

Clinton

On Wed, Apr 29, 2009 at 5:18 AM, Leffingwell, Jonathan R CTR FRCSE, JAX
7.2.2 <jonathan.leffingwell.ctr@navy.mil> wrote:

> Hey, thanks for the TONS of helpful replies I got to this question!  It's a
> good thing this wasn't to solve an enterprise question or anything.  Oh,
> wait...it was.
>
> Signing off...
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> Oracle v$session and iBatis
> Leffingwell, Jonathan R CTR FRCSE, JAX 7.2.2
> Tue, 14 Apr 2009 07:03:18 -0700
>
> We are monitoring our web app through, among other things, looking at the
> Oracle view v$session.  For testing purposes, we tested one user logging
> into the system, doing a couple of transactions, then logging out.  The
> number of "connections" (for lack of a better term) in v$session fluctuated
> greatly, and when the user logged out of the application, the number of
> "connections" went from 27...to 28!  Does it make sense for a user to log
> out and INCREASE the number of connections?
>
> Here's how my transaction manager is configured:
>
> <sqlMapConfig>
>  <settings
>    cacheModelsEnabled="false"
>    enhancementEnabled="false"
>        lazyLoadingEnabled="false"
>    maxSessions="64"
>    maxTransactions="32"
>    maxRequests="512"/>
>
>  <transactionManager type="JDBC">
>    <dataSource type="SIMPLE">
>                <property name="DataSource" value="${datasource}"/>
>                <property name="JDBC.Driver" value="${driver}"/>
>            <property name="JDBC.ConnectionURL" value="${url}"/>
>                <property name="JDBC.Username" value="${username}"/>
>                <property name="JDBC.Password" value="${password}"/>
>                <property name="JDBC.DefaultAutoCommit"
> value="$(autocommit)"/>
>                <property name="Pool.MaximumActiveConnections" value="10"/>
> <!-- Default = 10 -->
>                <property name="Pool.MaximumIdleConnections" value="5"/>
> <!-- Default = 5  -->
>                <property name="Pool.MaximumCheckoutTime" value="20000"/>
> <!-- Default = 20000 milliseconds  -->
>                <property name="Pool.TimeToWait" value="20000"/>
> <!-- Default = 20000 milliseconds  -->
>                <property name="Pool.PingEnabled" value="true"/>
> <!-- Default = false  -->
>                <property name="Pool.PingQuery" value="select 0 from dual"/>
> <!-- No Default Query  -->
>                <property name="Pool.PingConnectionsOlderThan"
> value="7200000"/>               <!-- Default = 0 milliseconds  -->
>                <property name="Pool.PingConnectionsNotUsedFor"
> value="7200000"/>               <!-- No Default  -->
>    </dataSource>
>  </transactionManager>
>
>  <sqlMap resource="folder/sql/ourSQL.xml"/>
>
> </sqlMapConfig>
>
> Can anyone tell me how connections are handled in a simple datasource in
> iBatis, with respect to the v$session view?  Is connection pooling not
> happening?  Any insight would be appreciated, and my apologies in advance
> if
> I'm not clear.
>
> Jonathan
>

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