how-do-i-find-the-size-of-a-queue.xml

<div class="wiki-content maincontent"><p>How do I check on the size of the queue? I know it's not JMS standard, but most JMS implementations have a way to do this.</p>

<p>You can view the queue depth using the MBeans in ActiveMQ 5.x. Use any JMX management console to see the statistics. See <link><page ri:content-title="How can I monitor ActiveMQ"></page></link>.</p>

<p>You can also browse the contents of a queue using the JMS <a shape="rect" href="http://java.sun.com/j2ee/1.4/docs/api/javax/jms/QueueBrowser.html">QueueBrowser</a>.</p>

<p>Or you can access statistics <link><page ri:content-title="How can I see what destinations are used"></page><link-body>programmatically</link-body></link></p>

<p>Through the MBeans, you can monitor individual destinations including message statistics related to the destination. For example, you'll see the following attributes on a destination (Queue or Topic):</p>

<ul><li>Enqueue Count - the total number of messages sent to the queue since the last restart</li><li>Dequeue Count - the total number of messages removed from the queue (ack'd by consumer) since last restart</li><li>Inflight Count - the number of messages sent to a consumer session and have not received an ack</li><li>Dispatch Count - the total number of messages sent to consumer sessions (Dequeue + Inflight)</li><li>Expired Count - the number of messages that were not delivered because they were expired</li></ul>


<p>The "size of a queue" is also explicitly called out in an attribute "QueueSize." QueueSize is the total number of messages in the queue/store that have not been ack'd by a consumer. This can become confusing at times when compared to the Enqueue Count because the Enqueue Count is a count over a period of time (since the last broker restart) while the Queue Size is not dependent on a period of time but instead on the actual number of messages in the store. </p></div>