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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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− | 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] | + | |
+ | >>>>>> 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 11:15, 1 February 2011
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Key API
>>>>>> THIS PAGE IS IN PROGRESS. PLEASE SEE DISCUSSION. See also the discussion for Performance Monitoring and Profiling <<<<<<
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.