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Difference between revisions of "EclipseLink/UserGuide/JPA/Advanced JPA Development/Performance/Performance Monitoring and Profiling/Query Monitoring"

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'''[[Image:Elug_draft_icon.png|Warning]] This page is now obsolete. '''
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For current information, please see "Query Monitoring" in the ''EclipseLink Concepts Guide'':
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http://www.eclipse.org/eclipselink/documentation/latest/concepts/monitoring004.htm
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Latest revision as of 07:43, 17 April 2013



Warning This page is now obsolete.

For current information, please see "Query Monitoring" in the EclipseLink Concepts Guide: http://www.eclipse.org/eclipselink/documentation/latest/concepts/monitoring004.htm




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Query Monitoring

Use the Query Monitor to measure query executions and cache hits. This can be useful for performance analysis in a complex system.

Enable the Query Monitor in either of these ways:

  • Set the System property org.eclipse.persistence.querymonitor=true.
  • In persistence.xml, set <property name="eclipselink.profiler" value="QueryMonitor"/>

The monitor dumps the number of query cache hits and executions (misses) once every 100 seconds.

For more information about querying, see Querying.

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