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

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* [http://www.eclipse.org/eclipselink/api/latest/org/eclipse/persistence/tools/profiler/QueryMonitor.html QueryMonitor]
 
* [http://www.eclipse.org/eclipselink/api/latest/org/eclipse/persistence/tools/profiler/QueryMonitor.html QueryMonitor]
 
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THIS PAGE IS IN PROGRESS. PLEASE SEE DISCUSSION. See also the discussion for [http://wiki.eclipse.org/Talk:EclipseLink/UserGuide/JPA/Advanced_JPA_Development/Performance/Performance_Monitoring_and_Profiling Performance Monitoring and Profiling]
 
  
 
=Query Monitoring=
 
=Query Monitoring=

Revision as of 11:16, 21 February 2011

EclipseLink JPA

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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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Version: 2.2.0 DRAFT
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