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 <div class="sect1">
 <h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Performance Monitoring</font></h1>
 <p>Use the Performance Monitor to provide detailed profiling and monitoring information in a multithreaded server environment.</p>
 <p>Enable the monitor in persistence.xml as follows:</p>
 <pre xml:space="preserve" class="oac_no_warn">
 &lt;property name="eclipselink.profiler" value="PerformanceMonitor"/&gt;
 </pre>
 <p>The performance monitor can also be enabled through code using a <code>SessionCustomizer</code>.</p>
 <p>The performance monitor will output a dump of cumulative statistics every minute to the EclipseLink log.</p>
 <p>The statistics contains three sets of information:</p>
 <ul>
 <li>
 <p><strong>Info</strong>; statistics that are constant informational data, such as the session name, or time of login.</p>
 </li>
 <li>
 <p><strong>Counter</strong>; statistics that are cumulative counters of total operations, such as cache hits, or query executions.</p>
 </li>
 <li>
 <p><strong>Timer</strong>; statistics that are cumulative measurements of total time (in nano seconds) for a specific type of operation, reading, writing, database operations.</p>
 </li>
 </ul>
 <p>Statistics are generally grouped in total and also by query type, query class, and query name. Counters and timers are generally recorded for the same operations, so the time per operation could also be calculated.</p>
 <p>The time in between statistic dumps can be configured through the <code>PerformanceMonitor</code> API using the <code>setDumpTime(long)</code> API. If dumping the results is not desired, then the <code>dumpTime</code> attribute can be set to be very large such as <code>Long.MAX_VALUE</code>. The statistic can also be accessed in a Java program by using the <code>getOperationTime(String)</code> API.</p>
 <p>The performance monitor can also be configured with a profile weight.</p>
 <p>The profile weights are defined on <code>SessionProfiler</code> and include:</p>
 <ul>
 <li>
 <p><strong>NONE</strong>; No statistics are recorded.</p>
 </li>
 <li>
 <p><strong>NORMAL</strong>; Informational statistics are recorded.</p>
 </li>
 <li>
 <p><strong>HEAVY</strong>; Informational, counter and timer statistics are recorded.</p>
 </li>
 <li>
 <p><strong>ALL</strong>; All statistics are recorded (this is the default).</p>
 </li>
 </ul>
 <p><a href="#BABBBIBG">Example 13-1</a> illustrates sample output from the Performance Monitor.</p>
 <div class="example"><a id="BABBBIBG" name="BABBBIBG"></a><a id="OTLCG94450" name="OTLCG94450"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 13-1 Example Output</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 Performance Monitor:1279113281664
 Operation     Value (ns)
 Counter:CacheHits     1,375,664
 Counter:CacheMisses     127
 Counter:ClientSessionCreates     1,204,817
 Counter:ConnectCalls     2
 Counter:DataModifyQuery     48
 Counter:DataModifyQuery:inventory     21
 Counter:DataModifyQuery:order     27
 Counter:DeleteObjectQuery     67,792
 Counter:DeleteObjectQuery:Customer     1
 ...
 Counter:ReadAllQuery     1,041,767.
 Counter:ReadAllQuery:Item.findByCategory     733,827
 Counter:ReadAllQuery:Item.findByCategory:CacheHits     733,779
 Counter:ReadAllQuery:Item.findByCategory:CacheMisses     50
 ...
 Counter:ReadObjectQuery     1,058,273
 Counter:ReadObjectQuery:Item:item     130,063
 Counter:ReadObjectQuery:Item:item:CacheHits     130,063
 Counter:ReadObjectQuery:Item:item:CacheMisses     1
 Counter:UnitOfWorkCommits     72,568
 Counter:UnitOfWorkCreates     471,491
 Counter:UnitOfWorkRollbacks     1
 Counter:UpdateObjectQuery     71,498
 Counter:UpdateObjectQuery:Customer     62,531
 ...
 Info:LoginTime     Wed Jul 14 08:55:41 EDT 2010
 Info:SessionName     file:/scratch/user_domains/servers/mt-1/app.jar
 Timer:Caching     6,411,372,000
 Timer:ConnectionManagement     17,225,641,000
 Timer:DeleteObjectQuery     41,351,430,000
 Timer:DeleteObjectQuery:Customer     4,441,000
 Timer:DeleteObjectQuery:Customer:QueryPreparation     86,000
 Timer:DeleteObjectQuery:Customer:SqlGeneration     28,000
 Timer:DeleteObjectQuery:Customer:SqlPrepare     72,000
 Timer:DeleteObjectQuery:Customer:StatementExecute     2,265,000
 ...
 Timer:InsertObjectQuery     69,111,086,000
 Timer:Logging     4,236,000
 Timer:Merge     1,144,400,000
 Timer:ObjectBuilding     31,914,397,000
 Timer:QueryPreparation     984,396,000
 Timer:ReadAllQuery     260,943,930,000
 Timer:ReadAllQuery:Item:Item.findByCategory     14,790,333,000
 Timer:ReadAllQuery:Item:Item.findByCategory:ObjectBuilding     250,959,000
 Timer:ReadAllQuery:Item:Item.findByCategory:QueryPreparation     1,880,000
 Timer:ReadAllQuery:Item:Item.findByCategory:RowFetch     113,552,000
 Timer:ReadAllQuery:Item:Item.findByCategory:SqlGeneration     522,000
 Timer:ReadAllQuery:Item:Item.findByCategory:SqlPrepare     2,055,000
 Timer:ReadAllQuery:Item:Item.findByCategory:StatementExecute     107,382,000
 ...
 Timer:Register     3,272,443,000
 Timer:RowFetch     25,340,990,000
 Timer:Sequencing     1,352,326,000
 Timer:SqlGeneration     6,646,000
 Timer:SqlPrepare     19,536,031,000
 Timer:StatementExecute     508,589,220,000
 Timer:TXAfterCompletion     1,854,152,000
 Timer:TXBeforeCompletion     169,381,843,000
 Timer:UnitOfWorkCommit     167,483,825,000
 Timer:UpdateObjectQuery     46,440,589,000
 Timer:UpdateObjectQuery:Customer     40,466,433,000
 Timer:UpdateObjectQuery:Customer:QueryPreparation     867,496,000
 Timer:UpdateObjectQuery:Customer:SqlGeneration     98,000
 Timer:UpdateObjectQuery:Customer:SqlPrepare     1,319,333,000
 Timer:UpdateObjectQuery:Customer:StatementExecute     32,901,366,000
 </pre></div>
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	<div class="sect1">
	<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Performance Monitoring</font></h1>
	<p>Use the Performance Monitor to provide detailed profiling and monitoring information in a multithreaded server environment.</p>
	<p>Enable the monitor in persistence.xml as follows:</p>
	<pre xml:space="preserve" class="oac_no_warn">
	<property name="eclipselink.profiler" value="PerformanceMonitor"/>
	</pre>
	<p>The performance monitor can also be enabled through code using a <code>SessionCustomizer</code>.</p>
	<p>The performance monitor will output a dump of cumulative statistics every minute to the EclipseLink log.</p>
	<p>The statistics contains three sets of information:</p>
	<ul>
	<li>
	<p><strong>Info</strong>; statistics that are constant informational data, such as the session name, or time of login.</p>
	</li>
	<li>
	<p><strong>Counter</strong>; statistics that are cumulative counters of total operations, such as cache hits, or query executions.</p>
	</li>
	<li>
	<p><strong>Timer</strong>; statistics that are cumulative measurements of total time (in nano seconds) for a specific type of operation, reading, writing, database operations.</p>
	</li>
	</ul>
	<p>Statistics are generally grouped in total and also by query type, query class, and query name. Counters and timers are generally recorded for the same operations, so the time per operation could also be calculated.</p>
	<p>The time in between statistic dumps can be configured through the <code>PerformanceMonitor</code> API using the <code>setDumpTime(long)</code> API. If dumping the results is not desired, then the <code>dumpTime</code> attribute can be set to be very large such as <code>Long.MAX_VALUE</code>. The statistic can also be accessed in a Java program by using the <code>getOperationTime(String)</code> API.</p>
	<p>The performance monitor can also be configured with a profile weight.</p>
	<p>The profile weights are defined on <code>SessionProfiler</code> and include:</p>
	<ul>
	<li>
	<p><strong>NONE</strong>; No statistics are recorded.</p>
	</li>
	<li>
	<p><strong>NORMAL</strong>; Informational statistics are recorded.</p>
	</li>
	<li>
	<p><strong>HEAVY</strong>; Informational, counter and timer statistics are recorded.</p>
	</li>
	<li>
	<p><strong>ALL</strong>; All statistics are recorded (this is the default).</p>
	</li>
	</ul>
	<p><a href="#BABBBIBG">Example 13-1</a> illustrates sample output from the Performance Monitor.</p>
	<div class="example"><a id="BABBBIBG" name="BABBBIBG"></a><a id="OTLCG94450" name="OTLCG94450"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 13-1 Example Output</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	Performance Monitor:1279113281664
	Operation Value (ns)
	Counter:CacheHits 1,375,664
	Counter:CacheMisses 127
	Counter:ClientSessionCreates 1,204,817
	Counter:ConnectCalls 2
	Counter:DataModifyQuery 48
	Counter:DataModifyQuery:inventory 21
	Counter:DataModifyQuery:order 27
	Counter:DeleteObjectQuery 67,792
	Counter:DeleteObjectQuery:Customer 1
	...
	Counter:ReadAllQuery 1,041,767.
	Counter:ReadAllQuery:Item.findByCategory 733,827
	Counter:ReadAllQuery:Item.findByCategory:CacheHits 733,779
	Counter:ReadAllQuery:Item.findByCategory:CacheMisses 50
	...
	Counter:ReadObjectQuery 1,058,273
	Counter:ReadObjectQuery:Item:item 130,063
	Counter:ReadObjectQuery:Item:item:CacheHits 130,063
	Counter:ReadObjectQuery:Item:item:CacheMisses 1
	Counter:UnitOfWorkCommits 72,568
	Counter:UnitOfWorkCreates 471,491
	Counter:UnitOfWorkRollbacks 1
	Counter:UpdateObjectQuery 71,498
	Counter:UpdateObjectQuery:Customer 62,531
	...
	Info:LoginTime Wed Jul 14 08:55:41 EDT 2010
	Info:SessionName file:/scratch/user_domains/servers/mt-1/app.jar
	Timer:Caching 6,411,372,000
	Timer:ConnectionManagement 17,225,641,000
	Timer:DeleteObjectQuery 41,351,430,000
	Timer:DeleteObjectQuery:Customer 4,441,000
	Timer:DeleteObjectQuery:Customer:QueryPreparation 86,000
	Timer:DeleteObjectQuery:Customer:SqlGeneration 28,000
	Timer:DeleteObjectQuery:Customer:SqlPrepare 72,000
	Timer:DeleteObjectQuery:Customer:StatementExecute 2,265,000
	...
	Timer:InsertObjectQuery 69,111,086,000
	Timer:Logging 4,236,000
	Timer:Merge 1,144,400,000
	Timer:ObjectBuilding 31,914,397,000
	Timer:QueryPreparation 984,396,000
	Timer:ReadAllQuery 260,943,930,000
	Timer:ReadAllQuery:Item:Item.findByCategory 14,790,333,000
	Timer:ReadAllQuery:Item:Item.findByCategory:ObjectBuilding 250,959,000
	Timer:ReadAllQuery:Item:Item.findByCategory:QueryPreparation 1,880,000
	Timer:ReadAllQuery:Item:Item.findByCategory:RowFetch 113,552,000
	Timer:ReadAllQuery:Item:Item.findByCategory:SqlGeneration 522,000
	Timer:ReadAllQuery:Item:Item.findByCategory:SqlPrepare 2,055,000
	Timer:ReadAllQuery:Item:Item.findByCategory:StatementExecute 107,382,000
	...
	Timer:Register 3,272,443,000
	Timer:RowFetch 25,340,990,000
	Timer:Sequencing 1,352,326,000
	Timer:SqlGeneration 6,646,000
	Timer:SqlPrepare 19,536,031,000
	Timer:StatementExecute 508,589,220,000
	Timer:TXAfterCompletion 1,854,152,000
	Timer:TXBeforeCompletion 169,381,843,000
	Timer:UnitOfWorkCommit 167,483,825,000
	Timer:UpdateObjectQuery 46,440,589,000
	Timer:UpdateObjectQuery:Customer 40,466,433,000
	Timer:UpdateObjectQuery:Customer:QueryPreparation 867,496,000
	Timer:UpdateObjectQuery:Customer:SqlGeneration 98,000
	Timer:UpdateObjectQuery:Customer:SqlPrepare 1,319,333,000
	Timer:UpdateObjectQuery:Customer:StatementExecute 32,901,366,000
	</pre></div>
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