13.8. Caching statistics

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If you enable the `hibernate.generate_statistics` configuration property,
Hibernate will expose a number of metrics via `SessionFactory.getStatistics()`.
Hibernate can even be configured to expose these statistics via JMX.

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<div class="paragraph">

This way, you can get access to the [`Statistics`](https://docs.jboss.org/hibernate/orm/5.2/javadocs/org/hibernate/stat/Statistics.html) class which comprises all sort of
second-level cache metrics.

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<div id="caching-statistics-example" class="exampleblock">
<div class="title">Example 331. Caching statistics</div>
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<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight">`Statistics statistics = session.getSessionFactory().getStatistics();
SecondLevelCacheStatistics secondLevelCacheStatistics =
        statistics.getSecondLevelCacheStatistics( "query.cache.person" );
long hitCount = secondLevelCacheStatistics.getHitCount();
long missCount = secondLevelCacheStatistics.getMissCount();
double hitRatio = (double) hitCount / ( hitCount + missCount );`</pre>
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<div class="sect2">