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            <article class="content wrap" id="_content" data-uid="Apache.Ignite.Core.Configuration.DataPageEvictionMode">
  
  
  <h1 id="Apache_Ignite_Core_Configuration_DataPageEvictionMode" data-uid="Apache.Ignite.Core.Configuration.DataPageEvictionMode" class="text-break">Enum DataPageEvictionMode
  </h1>
  <div class="markdown level0 summary"><p>Memory page eviction mode.
Only data pages, that store key-value entries, are eligible for eviction.
The other types of pages, like index or system pages, are not evictable.</p>
</div>
  <div class="markdown level0 conceptual"></div>
  <h6><strong>Namespace</strong>: <a class="xref" href="Apache.Ignite.Core.Configuration.html">Apache.Ignite.Core.Configuration</a></h6>
  <h6><strong>Assembly</strong>: Apache.Ignite.Core.dll</h6>
  <h5 id="Apache_Ignite_Core_Configuration_DataPageEvictionMode_syntax">Syntax</h5>
  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public enum DataPageEvictionMode</code></pre>
  </div>
  <h3 id="fields">Fields
  </h3>
  <table class="table table-bordered table-striped table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    <thead>
    <tbody>
      <tr>
        <td id="Apache_Ignite_Core_Configuration_DataPageEvictionMode_Disabled">Disabled</td>
        <td><p>Eviction is disabled.</p>
</td>
      </tr>
      <tr>
        <td id="Apache_Ignite_Core_Configuration_DataPageEvictionMode_Random2Lru">Random2Lru</td>
        <td><p>Activates Random-2-LRU algorithm which is a scan resistant version of Random-LRU.
<p>
This algorithm differs from Random-LRU only in a way that two latest access timestamps are stored for every
data page. At the eviction time, a minimum between two latest timestamps is taken for further
comparison with minimums of other pages that might be evicted. LRU-2 outperforms LRU by
resolving &quot;one-hit wonder&quot; problem - if a data page is accessed rarely, but accidentally accessed once,
its protected from eviction for a long time.</p>
</td>
      </tr>
      <tr>
        <td id="Apache_Ignite_Core_Configuration_DataPageEvictionMode_RandomLru">RandomLru</td>
        <td><p>Random-LRU algorithm.
<p>
Once a memory region defined by a memory policy is configured, an off-heap array is allocated to track
last usage timestamp for every individual data page. The size of the array equals to
<a class="xref" href="Apache.Ignite.Core.Configuration.DataRegionConfiguration.html#Apache_Ignite_Core_Configuration_DataRegionConfiguration_MaxSize">MaxSize</a> / <a class="xref" href="Apache.Ignite.Core.Configuration.DataStorageConfiguration.html#Apache_Ignite_Core_Configuration_DataStorageConfiguration_PageSize">PageSize</a>.
<p>
When a data page is accessed, its timestamp gets updated in the tracking array. The page index in the
tracking array equals to pageAddress / <a class="xref" href="Apache.Ignite.Core.Configuration.DataRegionConfiguration.html#Apache_Ignite_Core_Configuration_DataRegionConfiguration_MaxSize">MaxSize</a>.
<p>
When some pages need to be evicted, the algorithm randomly chooses 5 indexes from the tracking array and
evicts a page with the latest timestamp. If some of the indexes point to non-data pages
(index or system pages) then the algorithm picks other pages.</p>
</td>
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