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<div class="aboutLanguage"><em><b>Berkeley DB</b><br><font size="-1"> version 6.1.29</font></em></div>
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<div class="subTitle">com.sleepycat.db</div>
<h2 title="Class CacheStats" class="title">Class CacheStats</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<ul class="inheritance">
<li>com.sleepycat.db.CacheStats</li>
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<pre>public class <span class="strong">CacheStats</span>
extends java.lang.Object</pre>
<div class="block">Cache statistics for a database environment.</div>
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<h3>Method Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getAlloc()">getAlloc</a></strong>()</code>
<div class="block">Number of page allocations.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getAllocBuckets()">getAllocBuckets</a></strong>()</code>
<div class="block">Number of hash buckets checked during allocation.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getAllocMaxBuckets()">getAllocMaxBuckets</a></strong>()</code>
<div class="block">Maximum number of hash buckets checked during an allocation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getAllocMaxPages()">getAllocMaxPages</a></strong>()</code>
<div class="block">Maximum number of pages checked during an allocation.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getAllocPages()">getAllocPages</a></strong>()</code>
<div class="block">Number of pages checked during allocation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getBytes()">getBytes</a></strong>()</code>
<div class="block">Bytes of cache (total cache size is st_gbytes + st_bytes).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getCacheHit()">getCacheHit</a></strong>()</code>
<div class="block">Requested pages found in the cache.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getCacheMiss()">getCacheMiss</a></strong>()</code>
<div class="block">Requested pages not found in the cache.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getGbytes()">getGbytes</a></strong>()</code>
<div class="block">Gigabytes of cache (total cache size is st_gbytes + st_bytes).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getHashBuckets()">getHashBuckets</a></strong>()</code>
<div class="block">Number of hash buckets in the buffer hash table.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getHashExamined()">getHashExamined</a></strong>()</code>
<div class="block">Total number of hash elements traversed during hash table lookups.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getHashLongest()">getHashLongest</a></strong>()</code>
<div class="block">The longest chain ever encountered in buffer hash table lookups.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getHashMaxNowait()">getHashMaxNowait</a></strong>()</code>
<div class="block">The number of times a thread of control was able to obtain the
hash bucket lock without waiting on the bucket which had the
maximum number of times that a thread of control needed to wait.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getHashMaxWait()">getHashMaxWait</a></strong>()</code>
<div class="block">The maximum number of times any hash bucket lock was waited for by
a thread of control.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getHashMutexes()">getHashMutexes</a></strong>()</code>
<div class="block">The number of hash bucket mutexes in the buffer hash table.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getHashNowait()">getHashNowait</a></strong>()</code>
<div class="block">The number of times that a thread of control was able to obtain a
hash bucket lock without waiting.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getHashSearches()">getHashSearches</a></strong>()</code>
<div class="block">Total number of buffer hash table lookups.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getHashWait()">getHashWait</a></strong>()</code>
<div class="block">The number of times that a thread of control was forced to wait
before obtaining a hash bucket lock.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getIoWait()">getIoWait</a></strong>()</code>
<div class="block">Number of operations blocked waiting for I/O to complete.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMap()">getMap</a></strong>()</code>
<div class="block">Requested pages mapped into the process' address space (there is no
available information about whether or not this request caused disk I/O,
although examining the application page fault rate may be helpful).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMaxNumCache()">getMaxNumCache</a></strong>()</code>
<div class="block">Maximum number of caches, as configured with
<a href="../../../com/sleepycat/db/EnvironmentConfig.html#setCacheMax(long)"><code>EnvironmentConfig.setCacheMax(long)</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMaxOpenfd()">getMaxOpenfd</a></strong>()</code>
<div class="block">Maximum number of open file descriptors.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMaxWrite()">getMaxWrite</a></strong>()</code>
<div class="block">The maximum number of sequential write operations scheduled by the library
when flushing dirty pages from the cache.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMaxWriteSleep()">getMaxWriteSleep</a></strong>()</code>
<div class="block">The number of microseconds the thread of control should pause before
scheduling further write operations.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMmapSize()">getMmapSize</a></strong>()</code>
<div class="block">Maximum file size for mmap.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMultiversionFreed()">getMultiversionFreed</a></strong>()</code>
<div class="block">Number of frozen buffers freed.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMultiversionFrozen()">getMultiversionFrozen</a></strong>()</code>
<div class="block">Number of buffers frozen.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMultiversionReused()">getMultiversionReused</a></strong>()</code>
<div class="block">Number of outdated intermediate versions reused.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getMultiversionThawed()">getMultiversionThawed</a></strong>()</code>
<div class="block">Number of buffers thawed.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getNumCache()">getNumCache</a></strong>()</code>
<div class="block">Number of caches.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getPageClean()">getPageClean</a></strong>()</code>
<div class="block">Clean pages currently in the cache.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getPageCreate()">getPageCreate</a></strong>()</code>
<div class="block">Pages created in the cache.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getPageDirty()">getPageDirty</a></strong>()</code>
<div class="block">Dirty pages currently in the cache.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getPageIn()">getPageIn</a></strong>()</code>
<div class="block">Pages read into the cache.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getPageOut()">getPageOut</a></strong>()</code>
<div class="block">Pages written from the cache to the backing file.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getPages()">getPages</a></strong>()</code>
<div class="block">Pages in the cache.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getPageSize()">getPageSize</a></strong>()</code>
<div class="block">Page size in bytes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getPageTrickle()">getPageTrickle</a></strong>()</code>
<div class="block">Dirty pages written using <a href="../../../com/sleepycat/db/Environment.html#trickleCacheWrite(int)"><code>Environment.trickleCacheWrite</code></a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getRegionNowait()">getRegionNowait</a></strong>()</code>
<div class="block">The number of times that a thread of control was able to obtain a
cache region mutex without waiting.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getRegionWait()">getRegionWait</a></strong>()</code>
<div class="block">The number of times that a thread of control was forced to wait
before obtaining a cache region mutex.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getRegmax()">getRegmax</a></strong>()</code>
<div class="block">The maximum size, in bytes, of the mutex region.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getRegSize()">getRegSize</a></strong>()</code>
<div class="block">Individual cache size.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getRoEvict()">getRoEvict</a></strong>()</code>
<div class="block">Clean pages forced from the cache.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getRwEvict()">getRwEvict</a></strong>()</code>
<div class="block">Dirty pages forced from the cache.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#getSyncInterrupted()">getSyncInterrupted</a></strong>()</code>
<div class="block">Number of mpool sync operations interrupted.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/CacheStats.html#toString()">toString</a></strong>()</code>
<div class="block">For convenience, the CacheStats class has a toString method that
lists all the data fields.</div>
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</tr>
</table>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
</ul>
</li>
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<h3>Method Detail</h3>
<a name="getGbytes()">
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<h4>getGbytes</h4>
<pre>public int getGbytes()</pre>
<div class="block">Gigabytes of cache (total cache size is st_gbytes + st_bytes).</div>
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<a name="getBytes()">
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<h4>getBytes</h4>
<pre>public int getBytes()</pre>
<div class="block">Bytes of cache (total cache size is st_gbytes + st_bytes).</div>
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<a name="getNumCache()">
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<h4>getNumCache</h4>
<pre>public int getNumCache()</pre>
<div class="block">Number of caches.</div>
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<a name="getMaxNumCache()">
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<h4>getMaxNumCache</h4>
<pre>public int getMaxNumCache()</pre>
<div class="block">Maximum number of caches, as configured with
<a href="../../../com/sleepycat/db/EnvironmentConfig.html#setCacheMax(long)"><code>EnvironmentConfig.setCacheMax(long)</code></a>.</div>
</li>
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<a name="getMmapSize()">
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<h4>getMmapSize</h4>
<pre>public long getMmapSize()</pre>
<div class="block">Maximum file size for mmap.</div>
</li>
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<a name="getMaxOpenfd()">
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<h4>getMaxOpenfd</h4>
<pre>public int getMaxOpenfd()</pre>
<div class="block">Maximum number of open file descriptors.</div>
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<a name="getMaxWrite()">
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<h4>getMaxWrite</h4>
<pre>public int getMaxWrite()</pre>
<div class="block">The maximum number of sequential write operations scheduled by the library
when flushing dirty pages from the cache.</div>
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<a name="getMaxWriteSleep()">
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<h4>getMaxWriteSleep</h4>
<pre>public int getMaxWriteSleep()</pre>
<div class="block">The number of microseconds the thread of control should pause before
scheduling further write operations.</div>
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<h4>getPages</h4>
<pre>public int getPages()</pre>
<div class="block">Pages in the cache.</div>
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<a name="getMap()">
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<h4>getMap</h4>
<pre>public int getMap()</pre>
<div class="block">Requested pages mapped into the process' address space (there is no
available information about whether or not this request caused disk I/O,
although examining the application page fault rate may be helpful).</div>
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<a name="getCacheHit()">
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<h4>getCacheHit</h4>
<pre>public long getCacheHit()</pre>
<div class="block">Requested pages found in the cache.</div>
</li>
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<h4>getCacheMiss</h4>
<pre>public long getCacheMiss()</pre>
<div class="block">Requested pages not found in the cache.</div>
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<h4>getPageCreate</h4>
<pre>public long getPageCreate()</pre>
<div class="block">Pages created in the cache.</div>
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<a name="getPageIn()">
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<h4>getPageIn</h4>
<pre>public long getPageIn()</pre>
<div class="block">Pages read into the cache.</div>
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<a name="getPageOut()">
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<h4>getPageOut</h4>
<pre>public long getPageOut()</pre>
<div class="block">Pages written from the cache to the backing file.</div>
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<a name="getRoEvict()">
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<h4>getRoEvict</h4>
<pre>public long getRoEvict()</pre>
<div class="block">Clean pages forced from the cache.</div>
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<h4>getRwEvict</h4>
<pre>public long getRwEvict()</pre>
<div class="block">Dirty pages forced from the cache.</div>
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<h4>getPageTrickle</h4>
<pre>public long getPageTrickle()</pre>
<div class="block">Dirty pages written using <a href="../../../com/sleepycat/db/Environment.html#trickleCacheWrite(int)"><code>Environment.trickleCacheWrite</code></a>.</div>
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<pre>public int getPageClean()</pre>
<div class="block">Clean pages currently in the cache.</div>
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<h4>getPageDirty</h4>
<pre>public int getPageDirty()</pre>
<div class="block">Dirty pages currently in the cache.</div>
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<h4>getHashBuckets</h4>
<pre>public int getHashBuckets()</pre>
<div class="block">Number of hash buckets in the buffer hash table.</div>
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<h4>getHashMutexes</h4>
<pre>public int getHashMutexes()</pre>
<div class="block">The number of hash bucket mutexes in the buffer hash table.</div>
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<h4>getPageSize</h4>
<pre>public int getPageSize()</pre>
<div class="block">Page size in bytes.</div>
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<h4>getHashSearches</h4>
<pre>public int getHashSearches()</pre>
<div class="block">Total number of buffer hash table lookups.</div>
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<h4>getHashLongest</h4>
<pre>public int getHashLongest()</pre>
<div class="block">The longest chain ever encountered in buffer hash table lookups.</div>
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<h4>getHashExamined</h4>
<pre>public long getHashExamined()</pre>
<div class="block">Total number of hash elements traversed during hash table lookups.</div>
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<h4>getHashNowait</h4>
<pre>public long getHashNowait()</pre>
<div class="block">The number of times that a thread of control was able to obtain a
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<h4>getHashWait</h4>
<pre>public long getHashWait()</pre>
<div class="block">The number of times that a thread of control was forced to wait
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<h4>getHashMaxNowait</h4>
<pre>public long getHashMaxNowait()</pre>
<div class="block">The number of times a thread of control was able to obtain the
hash bucket lock without waiting on the bucket which had the
maximum number of times that a thread of control needed to wait.</div>
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<h4>getHashMaxWait</h4>
<pre>public long getHashMaxWait()</pre>
<div class="block">The maximum number of times any hash bucket lock was waited for by
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<h4>getRegionNowait</h4>
<pre>public long getRegionNowait()</pre>
<div class="block">The number of times that a thread of control was able to obtain a
cache region mutex without waiting.</div>
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<h4>getRegionWait</h4>
<pre>public long getRegionWait()</pre>
<div class="block">The number of times that a thread of control was forced to wait
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<h4>getMultiversionFrozen</h4>
<pre>public long getMultiversionFrozen()</pre>
<div class="block">Number of buffers frozen.</div>
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<pre>public long getMultiversionThawed()</pre>
<div class="block">Number of buffers thawed.</div>
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<h4>getMultiversionFreed</h4>
<pre>public long getMultiversionFreed()</pre>
<div class="block">Number of frozen buffers freed.</div>
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<h4>getMultiversionReused</h4>
<pre>public long getMultiversionReused()</pre>
<div class="block">Number of outdated intermediate versions reused.</div>
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<h4>getAlloc</h4>
<pre>public long getAlloc()</pre>
<div class="block">Number of page allocations.</div>
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<h4>getAllocBuckets</h4>
<pre>public long getAllocBuckets()</pre>
<div class="block">Number of hash buckets checked during allocation.</div>
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<h4>getAllocMaxBuckets</h4>
<pre>public long getAllocMaxBuckets()</pre>
<div class="block">Maximum number of hash buckets checked during an allocation.</div>
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<h4>getAllocPages</h4>
<pre>public long getAllocPages()</pre>
<div class="block">Number of pages checked during allocation.</div>
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<h4>getAllocMaxPages</h4>
<pre>public long getAllocMaxPages()</pre>
<div class="block">Maximum number of pages checked during an allocation.</div>
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<h4>getIoWait</h4>
<pre>public long getIoWait()</pre>
<div class="block">Number of operations blocked waiting for I/O to complete.</div>
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<h4>getSyncInterrupted</h4>
<pre>public long getSyncInterrupted()</pre>
<div class="block">Number of mpool sync operations interrupted.</div>
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<h4>getRegSize</h4>
<pre>public long getRegSize()</pre>
<div class="block">Individual cache size.</div>
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<h4>getRegmax</h4>
<pre>public long getRegmax()</pre>
<div class="block">The maximum size, in bytes, of the mutex region.</div>
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<h4>toString</h4>
<pre>public java.lang.String toString()</pre>
<div class="block">For convenience, the CacheStats class has a toString method that
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<dt><strong>Overrides:</strong></dt>
<dd><code>toString</code> in class <code>java.lang.Object</code></dd>
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