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I would like to know what does the numIdle attribute refers to.

On the tomcat FAQ there the attributes numActive and numIdle are reffered on the JNDI DataSource section. I have been able to identify that numActive is the number of active connections on the pool. I would like to know what connections are established but idle(with no running thread associated to it). I imagined that value was numIdle but its value is different from Probe's "number of established connections that can be reused"; On probe that value is always 8 but numIdle is constantly 0.

Is there an attribute that provides that value?

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According to this link it means the following:

enter image description here

I wonder if it is still supported by Tomcat 7 and 8. It seems that it is supported by Tomcat 6 (see last edited 2013-12-19 10:14:01 by DmytroMrachkovskyi at the bottom of the website). Have you tried to configure it in Tomcat 7 and 8. Does it start?

What is an Idle Instance?

According to this URL it is:

an instance that has not been started

Code

SpringSource / org.apache.tomcat .....pache.tomcat.jdbc / 1.0.8.5 [1.0.8.5 - 1.0.9.3] [1.0.9.0] / org / apache / tomcat / jdbc / pool / mbeans-descriptors.xml

The number of established connections in the pool that are idle

<mbeans-descriptors> <mbean name="TomcatJDBCPool" description="Provides per diagnostic metrics and notifications for JDBC operations" domain="tomcat" group="jdbc" type="org.apache.tomcat.jdbc.pool.DataSource"> ... <attribute name="idle" description="The number of established connections in the pool that are idle" type="java.lang.Integer" writeable="false"/> <attribute name="numIdle" description="Same as the idle attribute" type="java.lang.Integer" writeable="false"/> <attribute name="active" description="The number of established connections in the pool that are in use" type="java.lang.Integer" writeable="false"/> <attribute name="numActive" description="Same as the active attribute" type="java.lang.Integer" writeable="false"/> ... <operation name="testIdle" description="forces a validation of abandoned connections" impact="ACTION" returnType="void" /> </mbean> </mbeans-descriptors>
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  • Reading psy-probe's source code established = busy + inactive. Adding that to the information you provided, now I'm able to understand the those values. Commented Dec 3, 2015 at 14:13

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