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Yasuhiro KIMURA
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705 lines
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<div class="aboutLanguage"><b>Berkeley DB</b><br><font size="-1"> version 18.1.40</font></div>
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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">com.sleepycat.db</a></div>
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<h2 title="Class HashStats" class="title">Class HashStats</h2>
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<ul class="inheritance">
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<li>java.lang.Object</li>
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<li>
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<ul class="inheritance">
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<li><a href="DatabaseStats.html" title="class in com.sleepycat.db">com.sleepycat.db.DatabaseStats</a></li>
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<ul class="inheritance">
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<li>com.sleepycat.db.HashStats</li>
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<pre>public class <span class="typeNameLabel">HashStats</span>
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extends <a href="DatabaseStats.html" title="class in com.sleepycat.db">DatabaseStats</a></pre>
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<div class="block">The HashStats object is used to return Hash database statistics.</div>
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<div class="summary">
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</a>
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<h3>Method Summary</h3>
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<table class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colSecond" scope="col">Method</th>
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<th class="colLast" scope="col">Description</th>
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</tr>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code>long</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getBFree--">getBFree</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of bytes free on bucket pages.</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>long</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getBigBFree--">getBigBFree</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of bytes free on hash overflow (big item) pages.</div>
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</td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getBigPages--">getBigPages</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of hash overflow pages (created when key/data is too big for
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the page).</div>
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</td>
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</tr>
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<tr id="i3" class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getBuckets--">getBuckets</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of hash buckets.</div>
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</td>
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</tr>
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<tr id="i4" class="altColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDup--">getDup</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of duplicate pages.</div>
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</td>
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</tr>
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<tr id="i5" class="rowColor">
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<td class="colFirst"><code>long</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDupFree--">getDupFree</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of bytes free on duplicate pages.</div>
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</td>
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</tr>
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<tr id="i6" class="altColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getExtFiles--">getExtFiles</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of external files.</div>
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</td>
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</tr>
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<tr id="i7" class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getFfactor--">getFfactor</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The desired fill factor specified at database-creation time.</div>
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</td>
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</tr>
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<tr id="i8" class="altColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getFree--">getFree</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of pages on the free list.</div>
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</td>
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</tr>
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<tr id="i9" class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMagic--">getMagic</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The magic number that identifies the file as a Hash file.</div>
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</td>
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</tr>
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<tr id="i10" class="altColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMetaFlags--">getMetaFlags</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Reports internal flags.</div>
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</td>
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</tr>
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<tr id="i11" class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getNumBlobs--">getNumBlobs</a></span>()</code></th>
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<td class="colLast"> </td>
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</tr>
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<tr id="i12" class="altColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getNumData--">getNumData</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of key/data pairs in the database.</div>
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</td>
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</tr>
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<tr id="i13" class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getNumKeys--">getNumKeys</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of unique keys in the database.</div>
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</td>
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</tr>
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<tr id="i14" class="altColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getOverflows--">getOverflows</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of bucket overflow pages (bucket overflow pages are created when
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items did not fit on the main bucket page).</div>
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</td>
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</tr>
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<tr id="i15" class="rowColor">
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<td class="colFirst"><code>long</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getOvflFree--">getOvflFree</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of bytes free on bucket overflow pages.</div>
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</td>
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</tr>
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<tr id="i16" class="altColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getPageCount--">getPageCount</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The number of pages in the database.</div>
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</td>
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</tr>
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<tr id="i17" class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getPageSize--">getPageSize</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The underlying Hash database page (and bucket) size, in bytes.</div>
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</td>
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</tr>
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<tr id="i18" class="altColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getVersion--">getVersion</a></span>()</code></th>
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<td class="colLast">
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<div class="block">The version of the Hash database.</div>
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</td>
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</tr>
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<tr id="i19" class="rowColor">
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<td class="colFirst"><code>java.lang.String</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString--">toString</a></span>()</code></th>
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<td class="colLast">
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<div class="block">For convenience, the HashStats class has a toString method
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that lists all the data fields.</div>
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</td>
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</a>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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</ul>
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</li>
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</ul>
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<h3>Method Detail</h3>
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<a name="getMagic--">
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<h4>getMagic</h4>
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<pre class="methodSignature">public int getMagic()</pre>
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<div class="block">The magic number that identifies the file as a Hash file.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the magic number that identifies the files as a Hash file</dd>
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</dl>
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<h4>getVersion</h4>
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<pre class="methodSignature">public int getVersion()</pre>
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<div class="block">The version of the Hash database.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the version of the Hash database</dd>
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</dl>
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<h4>getMetaFlags</h4>
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<pre class="methodSignature">public int getMetaFlags()</pre>
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<div class="block">Reports internal flags. For internal use only.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>internal flags</dd>
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</dl>
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</li>
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</ul>
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<a name="getNumKeys--">
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<h4>getNumKeys</h4>
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<pre class="methodSignature">public int getNumKeys()</pre>
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<div class="block">The number of unique keys in the database.
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<p>
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If the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call was configured by the
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<a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method, the count will be the last
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saved value unless it has never been calculated, in which case it
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will be 0.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of unique keys in the database</dd>
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</dl>
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</li>
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</ul>
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<a name="getNumData--">
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<h4>getNumData</h4>
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<pre class="methodSignature">public int getNumData()</pre>
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<div class="block">The number of key/data pairs in the database.
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<p>
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If the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call was configured by the
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<a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method, the count will be the last
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saved value unless it has never been calculated, in which case it
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will be 0.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of key/data pairs in the database</dd>
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</dl>
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<h4>getExtFiles</h4>
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<pre class="methodSignature">public int getExtFiles()</pre>
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<div class="block">The number of external files.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of external files</dd>
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</dl>
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<h4>getNumBlobs</h4>
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<pre class="methodSignature">public int getNumBlobs()</pre>
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<h4>getPageCount</h4>
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<pre class="methodSignature">public int getPageCount()</pre>
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<div class="block">The number of pages in the database.
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<p>
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Returned if <a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast(boolean)</code></a> was configured.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of pages in the database</dd>
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<pre class="methodSignature">public int getPageSize()</pre>
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<div class="block">The underlying Hash database page (and bucket) size, in bytes.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the underlying Hash database page (and bucket) size, in bytes</dd>
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<pre class="methodSignature">public int getFfactor()</pre>
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<div class="block">The desired fill factor specified at database-creation time.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the desired fill factor specified at database-creation time</dd>
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<h4>getBuckets</h4>
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<pre class="methodSignature">public int getBuckets()</pre>
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<div class="block">The number of hash buckets.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of hash buckets</dd>
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<pre class="methodSignature">public int getFree()</pre>
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<div class="block">The number of pages on the free list.
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<p>
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The information is only included if the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call
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was not configured by the <a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of pages on the free list</dd>
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<pre class="methodSignature">public long getBFree()</pre>
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<div class="block">The number of bytes free on bucket pages.
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<p>
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The information is only included if the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call
|
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was not configured by the <a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of bytes free on bucket pages</dd>
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<h4>getBigPages</h4>
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<pre class="methodSignature">public int getBigPages()</pre>
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<div class="block">The number of hash overflow pages (created when key/data is too big for
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the page).
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<p>
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The information is only included if the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call
|
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was not configured by the <a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of hash overflow pages</dd>
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<h4>getBigBFree</h4>
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<pre class="methodSignature">public long getBigBFree()</pre>
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<div class="block">The number of bytes free on hash overflow (big item) pages.
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<p>
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The information is only included if the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call
|
|
was not configured by the <a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of bytes free on hash overflow pages</dd>
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</dl>
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</ul>
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<a name="getOverflows--">
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<h4>getOverflows</h4>
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<pre class="methodSignature">public int getOverflows()</pre>
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<div class="block">The number of bucket overflow pages (bucket overflow pages are created when
|
|
items did not fit on the main bucket page).
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|
<p>
|
|
The information is only included if the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call
|
|
was not configured by the <a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method.</div>
|
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<dl>
|
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<dt><span class="returnLabel">Returns:</span></dt>
|
|
<dd>the number of bucket overflow pages</dd>
|
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</dl>
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<h4>getOvflFree</h4>
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<pre class="methodSignature">public long getOvflFree()</pre>
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<div class="block">The number of bytes free on bucket overflow pages.
|
|
<p>
|
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The information is only included if the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call
|
|
was not configured by the <a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method.</div>
|
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<dl>
|
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<dt><span class="returnLabel">Returns:</span></dt>
|
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<dd>the number of bytes free on bucket overflow pages</dd>
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<h4>getDup</h4>
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<pre class="methodSignature">public int getDup()</pre>
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<div class="block">The number of duplicate pages.
|
|
<p>
|
|
The information is only included if the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call
|
|
was not configured by the <a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method.</div>
|
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the number of duplicate pages</dd>
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<h4>getDupFree</h4>
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<pre class="methodSignature">public long getDupFree()</pre>
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<div class="block">The number of bytes free on duplicate pages.
|
|
<p>
|
|
The information is only included if the <a href="Database.html#getStats-com.sleepycat.db.Transaction-com.sleepycat.db.StatsConfig-"><code>Database.getStats</code></a> call
|
|
was not configured by the <a href="StatsConfig.html#setFast-boolean-"><code>StatsConfig.setFast</code></a> method.</div>
|
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
|
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<dd>the number of bytes free on duplicate pages</dd>
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</dl>
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<h4>toString</h4>
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<pre class="methodSignature">public java.lang.String toString()</pre>
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<div class="block">For convenience, the HashStats class has a toString method
|
|
that lists all the data fields.</div>
|
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<dl>
|
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
|
|
<dd><code>toString</code> in class <code>java.lang.Object</code></dd>
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
|
<dd>a String that lists all the data fields</dd>
|
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</dl>
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</li>
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</ul>
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</li>
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</ul>
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