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 <div class="subTitle">org.apache.ignite</div>
 <h2 title="Interface DataStorageMetrics" class="title">Interface DataStorageMetrics</h2>
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 <dt>All Known Subinterfaces:</dt>
 <dd><a href="../../../org/apache/ignite/mxbean/DataStorageMetricsMXBean.html" title="interface in org.apache.ignite.mxbean">DataStorageMetricsMXBean</a></dd>
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 <br>
 <pre>public interface <span class="typeNameLabel">DataStorageMetrics</span></pre>
 <div class="block">Data storage metrics are used to obtain statistics on persistent store and whole data storage.</div>
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 <h3>Method Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getCheckpointBufferSize--">getCheckpointBufferSize</a></span>()</code>
 <div class="block">Checkpoint buffer size in bytes.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getCheckpointTotalTime--">getCheckpointTotalTime</a></span>()</code>
 <div class="block">Total checkpoint time from last restart.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getDirtyPages--">getDirtyPages</a></span>()</code>
 <div class="block">Total dirty pages for the next checkpoint.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getLastCheckpointCopiedOnWritePagesNumber--">getLastCheckpointCopiedOnWritePagesNumber</a></span>()</code>
 <div class="block">Gets the number of pages copied to a temporary checkpoint buffer during the last checkpoint.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getLastCheckpointDataPagesNumber--">getLastCheckpointDataPagesNumber</a></span>()</code>
 <div class="block">Gets the number of data pages written during the last checkpoint.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getLastCheckpointDuration--">getLastCheckpointDuration</a></span>()</code>
 <div class="block">Gets the duration of the last checkpoint in milliseconds.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getLastCheckpointFsyncDuration--">getLastCheckpointFsyncDuration</a></span>()</code>
 <div class="block">Gets the duration of the sync phase of the last checkpoint in milliseconds.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getLastCheckpointLockWaitDuration--">getLastCheckpointLockWaitDuration</a></span>()</code>
 <div class="block">Gets the duration of last checkpoint lock wait in milliseconds.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getLastCheckpointMarkDuration--">getLastCheckpointMarkDuration</a></span>()</code>
 <div class="block">Gets the duration of last checkpoint mark phase in milliseconds.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getLastCheckpointPagesWriteDuration--">getLastCheckpointPagesWriteDuration</a></span>()</code>
 <div class="block">Gets the duration of last checkpoint pages write phase in milliseconds.</div>
 </td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getLastCheckpointTotalPagesNumber--">getLastCheckpointTotalPagesNumber</a></span>()</code>
 <div class="block">Gets the total number of pages written during the last checkpoint.</div>
 </td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getOffHeapSize--">getOffHeapSize</a></span>()</code>
 <div class="block">Total offheap size in bytes.</div>
 </td>
 </tr>
 <tr id="i12" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getOffheapUsedSize--">getOffheapUsedSize</a></span>()</code>
 <div class="block">Total used offheap size in bytes.</div>
 </td>
 </tr>
 <tr id="i13" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getPagesRead--">getPagesRead</a></span>()</code>
 <div class="block">The number of read pages from last restart.</div>
 </td>
 </tr>
 <tr id="i14" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getPagesReplaced--">getPagesReplaced</a></span>()</code>
 <div class="block">The number of replaced pages from last restart.</div>
 </td>
 </tr>
 <tr id="i15" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getPagesWritten--">getPagesWritten</a></span>()</code>
 <div class="block">The number of written pages from last restart.</div>
 </td>
 </tr>
 <tr id="i16" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getTotalAllocatedSize--">getTotalAllocatedSize</a></span>()</code>
 <div class="block">Total size of memory allocated in bytes.</div>
 </td>
 </tr>
 <tr id="i17" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getUsedCheckpointBufferPages--">getUsedCheckpointBufferPages</a></span>()</code>
 <div class="block">Gets used checkpoint buffer size in pages.</div>
 </td>
 </tr>
 <tr id="i18" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getUsedCheckpointBufferSize--">getUsedCheckpointBufferSize</a></span>()</code>
 <div class="block">Gets used checkpoint buffer size in bytes.</div>
 </td>
 </tr>
 <tr id="i19" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getWalArchiveSegments--">getWalArchiveSegments</a></span>()</code>
 <div class="block">Gets the current number of WAL segments in the WAL archive.</div>
 </td>
 </tr>
 <tr id="i20" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getWalBuffPollSpinsRate--">getWalBuffPollSpinsRate</a></span>()</code>
 <div class="block">Returns WAL buffer poll spins number over the last time interval.</div>
 </td>
 </tr>
 <tr id="i21" class="rowColor">
 <td class="colFirst"><code>float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getWalFsyncTimeAverage--">getWalFsyncTimeAverage</a></span>()</code>
 <div class="block">Gets the average WAL fsync duration in microseconds over the last time interval.</div>
 </td>
 </tr>
 <tr id="i22" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getWalLastRollOverTime--">getWalLastRollOverTime</a></span>()</code>
 <div class="block">Time of the last WAL segment rollover.</div>
 </td>
 </tr>
 <tr id="i23" class="rowColor">
 <td class="colFirst"><code>float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getWalLoggingRate--">getWalLoggingRate</a></span>()</code>
 <div class="block">Gets the average number of WAL records per second written during the last time interval.</div>
 </td>
 </tr>
 <tr id="i24" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getWalTotalSize--">getWalTotalSize</a></span>()</code>
 <div class="block">Total size in bytes for storage wal files.</div>
 </td>
 </tr>
 <tr id="i25" class="rowColor">
 <td class="colFirst"><code>float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/DataStorageMetrics.html#getWalWritingRate--">getWalWritingRate</a></span>()</code>
 <div class="block">Gets the average number of bytes per second written during the last time interval.</div>
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 <h4>getWalLoggingRate</h4>
 <pre>float&nbsp;getWalLoggingRate()</pre>
 <div class="block">Gets the average number of WAL records per second written during the last time interval.
  <p>
  The length of time interval is configured via <a href="../../../org/apache/ignite/configuration/DataStorageConfiguration.html#setMetricsRateTimeInterval-long-"><code>DataStorageConfiguration.setMetricsRateTimeInterval(long)</code></a>
  configuration property.
  The number of subintervals is configured via <a href="../../../org/apache/ignite/configuration/DataStorageConfiguration.html#setMetricsSubIntervalCount-int-"><code>DataStorageConfiguration.setMetricsSubIntervalCount(int)</code></a>
  configuration property.</div>
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 <h4>getWalWritingRate</h4>
 <pre>float&nbsp;getWalWritingRate()</pre>
 <div class="block">Gets the average number of bytes per second written during the last time interval.
  The length of time interval is configured via <a href="../../../org/apache/ignite/configuration/DataStorageConfiguration.html#setMetricsRateTimeInterval-long-"><code>DataStorageConfiguration.setMetricsRateTimeInterval(long)</code></a>
  configuration property.
  The number of subintervals is configured via <a href="../../../org/apache/ignite/configuration/DataStorageConfiguration.html#setMetricsSubIntervalCount-int-"><code>DataStorageConfiguration.setMetricsSubIntervalCount(int)</code></a>
  configuration property.</div>
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 <h4>getWalArchiveSegments</h4>
 <pre>int&nbsp;getWalArchiveSegments()</pre>
 <div class="block">Gets the current number of WAL segments in the WAL archive.</div>
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 <pre>float&nbsp;getWalFsyncTimeAverage()</pre>
 <div class="block">Gets the average WAL fsync duration in microseconds over the last time interval.
  <p>
  The length of time interval is configured via <a href="../../../org/apache/ignite/configuration/DataStorageConfiguration.html#setMetricsRateTimeInterval-long-"><code>DataStorageConfiguration.setMetricsRateTimeInterval(long)</code></a>
  configuration property.
  The number of subintervals is configured via <a href="../../../org/apache/ignite/configuration/DataStorageConfiguration.html#setMetricsSubIntervalCount-int-"><code>DataStorageConfiguration.setMetricsSubIntervalCount(int)</code></a>
  configuration property.</div>
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 <pre>long&nbsp;getWalBuffPollSpinsRate()</pre>
 <div class="block">Returns WAL buffer poll spins number over the last time interval.
  <p>
  The length of time interval is configured via <a href="../../../org/apache/ignite/configuration/DataStorageConfiguration.html#setMetricsRateTimeInterval-long-"><code>DataStorageConfiguration.setMetricsRateTimeInterval(long)</code></a>
  configuration property.
  The number of subintervals is configured via <a href="../../../org/apache/ignite/configuration/DataStorageConfiguration.html#setMetricsSubIntervalCount-int-"><code>DataStorageConfiguration.setMetricsSubIntervalCount(int)</code></a>
  configuration property.</div>
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 <h4>getWalTotalSize</h4>
 <pre>long&nbsp;getWalTotalSize()</pre>
 <div class="block">Total size in bytes for storage wal files.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Total size in bytes for storage wal files.</dd>
 </dl>
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 <pre>long&nbsp;getWalLastRollOverTime()</pre>
 <div class="block">Time of the last WAL segment rollover.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Time of the last WAL segment rollover.</dd>
 </dl>
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 <pre>long&nbsp;getCheckpointTotalTime()</pre>
 <div class="block">Total checkpoint time from last restart.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Total checkpoint time from last restart.</dd>
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 <pre>long&nbsp;getLastCheckpointDuration()</pre>
 <div class="block">Gets the duration of the last checkpoint in milliseconds.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Total checkpoint duration in milliseconds.</dd>
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 <pre>long&nbsp;getLastCheckpointLockWaitDuration()</pre>
 <div class="block">Gets the duration of last checkpoint lock wait in milliseconds.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Checkpoint lock wait time in milliseconds.</dd>
 </dl>
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 <pre>long&nbsp;getLastCheckpointMarkDuration()</pre>
 <div class="block">Gets the duration of last checkpoint mark phase in milliseconds.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Checkpoint mark duration in milliseconds.</dd>
 </dl>
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 <pre>long&nbsp;getLastCheckpointPagesWriteDuration()</pre>
 <div class="block">Gets the duration of last checkpoint pages write phase in milliseconds.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Checkpoint pages write phase in milliseconds.</dd>
 </dl>
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 <pre>long&nbsp;getLastCheckpointFsyncDuration()</pre>
 <div class="block">Gets the duration of the sync phase of the last checkpoint in milliseconds.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Checkpoint fsync time in milliseconds.</dd>
 </dl>
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 <pre>long&nbsp;getLastCheckpointTotalPagesNumber()</pre>
 <div class="block">Gets the total number of pages written during the last checkpoint.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Total number of pages written during the last checkpoint.</dd>
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 <pre>long&nbsp;getLastCheckpointDataPagesNumber()</pre>
 <div class="block">Gets the number of data pages written during the last checkpoint.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Total number of data pages written during the last checkpoint.</dd>
 </dl>
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 <pre>long&nbsp;getLastCheckpointCopiedOnWritePagesNumber()</pre>
 <div class="block">Gets the number of pages copied to a temporary checkpoint buffer during the last checkpoint.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Total number of pages copied to a temporary checkpoint buffer during the last checkpoint.</dd>
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 <pre>long&nbsp;getDirtyPages()</pre>
 <div class="block">Total dirty pages for the next checkpoint.</div>
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 <div class="block">The number of read pages from last restart.</div>
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 <div class="block">The number of written pages from last restart.</div>
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 <div class="block">The number of replaced pages from last restart.</div>
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 <div class="block">Total offheap size in bytes.</div>
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 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Total offheap size in bytes.</dd>
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 <div class="block">Total used offheap size in bytes.</div>
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 <div class="block">Total size of memory allocated in bytes.</div>
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 <dd>Total size of memory allocated in bytes.</dd>
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 <div class="block">Gets used checkpoint buffer size in pages.</div>
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 <div class="block">Gets used checkpoint buffer size in bytes.</div>
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 <div class="block">Checkpoint buffer size in bytes.</div>
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 <dd>Checkpoint buffer size in bytes.</dd>
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 <p class="legalCopy"><small><table width="100%" border="0" cellspacing=0 cellpadding=0 style="padding: 5px">                                     <tr>                                         <td>                                             <table style="padding-left: 0; margin: 0">                                                 <tbody style="padding: 0; margin: 0">                                                     <tr style="padding: 0; margin: 0">                                                         <td>                                                             <a target=_blank href="https://ignite.apache.org"><nobr>2019 Copyright &#169; Apache Software Foundation</nobr></a>                                                         </td>                                                     </tr>                                                 </tbody>                                             </table>                                         </td>                                         <td width="100%" align="right" valign="center">                                             <a href="https://twitter.com/ApacheIgnite" class="twitter-follow-button" data-show-count="false" data-size="large">Follow @ApacheIgnite</a>                                         </td>                                     </tr>                                     <tr>                                         <td colspan="2" valign="top" align="left">                                             <table style="padding-left: 0; margin: 0">                                                 <tbody style="padding: 0; margin: 0">                                                     <tr style="padding: 0; margin: 0">                                                         <td>                                                             <b>Ignite Database and Caching Platform</b>                                                         </td>                                                         <td>:&nbsp;&nbsp;                                                             ver. <strong>2.7.6</strong>                                                         </td>                                                     </tr>                                                     <tr style="padding: 0; margin: 0">                                                         <td>                                                             <b>Release Date</b>                                                         </td>                                                         <td>:&nbsp;&nbsp;                                                             September 11 2019                                                         </td>                                                     </tr>                                                 </tbody>                                             </table>                                         </td>                                     </tr>                                     </table></small></p>
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