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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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− | Use the Query Monitor to measure query executions and cache hits. This can be useful for performance analysis in a complex system. Enable | + | 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 <tt>org.eclipse.persistence.querymonitor=true</tt>. | ||
+ | * Set the <tt>persistence.xml</tt> property <tt>eclipselink.profiler=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]]. | For more information about querying, see [[EclipseLink/UserGuide/JPA/Basic JPA Development/Querying|Querying]]. |
Revision as of 15:10, 28 January 2011
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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.
- Set the persistence.xml property eclipselink.profiler=QueryMonitor.
The monitor dumps the number of query cache hits and executions (misses) once every 100 seconds.
For more information about querying, see Querying.