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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'': | ||
+ | http://www.eclipse.org/eclipselink/documentation/latest/concepts/monitoring004.htm | ||
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− | * [http://www.eclipse.org/eclipselink/api/latest/org/eclipse/persistence/tools/profiler/ | + | * [http://www.eclipse.org/eclipselink/api/latest/org/eclipse/persistence/tools/profiler/QueryMonitor.html QueryMonitor] |
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=Query Monitoring= | =Query Monitoring= | ||
+ | Use the Query Monitor to measure query executions and cache hits. This can be useful for performance analysis in a complex system. | ||
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+ | Enable the Query Monitor in either of these ways: | ||
+ | |||
+ | * Set the System property <tt>org.eclipse.persistence.querymonitor=true</tt>. | ||
+ | * In <tt>persistence.xml</tt>, set <tt><property name="eclipselink.profiler" value="QueryMonitor"/></tt> | ||
+ | The monitor dumps the number of query cache hits and executions (misses) once every 100 seconds. | ||
+ | For more information about querying, see [[EclipseLink/UserGuide/JPA/Basic JPA Development/Querying|Querying]]. | ||
{{EclipseLink_JPA | {{EclipseLink_JPA |
Latest revision as of 07:43, 17 April 2013
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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Key API
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.