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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/memory-configuration/data-regions.adoc" target="_blank">Edit</a>
<h1>Configuring Data Regions</h1>
<div class="sect1">
<h2 id="overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Ignite uses the concept of <em>data regions</em> to control the amount of RAM available to a cache or a group of caches. A data region is a logical extendable area in RAM in which cached data resides. You can control the initial size of the region and the maximum size it can occupy. In addition to the size, data regions control <a href="/docs/2.9.0/persistence/native-persistence">persistence settings</a> for caches.</p>
</div>
<div class="paragraph">
<p>By default, there is one data region that can take up to 20% of RAM available to the node, and all caches you create are placed in that region; but you can add as many regions as you want. There are a couple of reasons why you may want to have multiple regions:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Regions allow you to configure the amount of RAM available to a cache or number of caches.</p>
</li>
<li>
<p>Persistence parameters are configured per region. If you want to have both in-memory only caches and the caches that store their content to disk, you need to configure two (or more) data regions with different persistence settings: one for in-memory caches and one for persistent caches.</p>
</li>
<li>
<p>Some memory parameters, such as <a href="/docs/2.9.0/memory-configuration/eviction-policies">eviction policies</a>, are configured per data region.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>See the following section to learn how to change the parameters of the default data region or configure multiple data regions.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="configuring-default-data-region">Configuring Default Data Region</h2>
<div class="sectionbody">
<div class="paragraph">
<p>By default, a new cache is added to the default data region. If you want to change the properties of the default data region, you can do so in the data storage configuration.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span> <span class="na">id=</span><span class="s">"ignite.cfg"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataStorageConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataStorageConfiguration"</span><span class="nt">&gt;</span>
<span class="c">&lt;!--
Default memory region that grows endlessly. Any cache will be bound to this memory region
unless another region is set in the cache's configuration.
--&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"defaultDataRegionConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataRegionConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"Default_Region"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- 100 MB memory region with disabled eviction. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"initialSize"</span> <span class="na">value=</span><span class="s">"#{100 * 1024 * 1024}"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="c">&lt;!-- other properties --&gt;</span>
<span class="nt">&lt;/bean&gt;</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">DataStorageConfiguration</span> <span class="n">storageCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">DataStorageConfiguration</span><span class="o">();</span>
<span class="nc">DataRegionConfiguration</span> <span class="n">defaultRegion</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">DataRegionConfiguration</span><span class="o">();</span>
<span class="n">defaultRegion</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"Default_Region"</span><span class="o">);</span>
<span class="n">defaultRegion</span><span class="o">.</span><span class="na">setInitialSize</span><span class="o">(</span><span class="mi">100</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span><span class="o">);</span>
<span class="n">storageCfg</span><span class="o">.</span><span class="na">setDefaultDataRegionConfiguration</span><span class="o">(</span><span class="n">defaultRegion</span><span class="o">);</span>
<span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span>
<span class="n">cfg</span><span class="o">.</span><span class="na">setDataStorageConfiguration</span><span class="o">(</span><span class="n">storageCfg</span><span class="o">);</span>
<span class="c1">// Start the node.</span>
<span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</span><span class="o">);</span></code></pre>
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</div></code-tab><code-tab data-tab='C#/.NET'><div class="listingblock">
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<pre class="rouge highlight"><code data-lang="csharp"><span class="kt">var</span> <span class="n">cfg</span> <span class="p">=</span> <span class="k">new</span> <span class="n">IgniteConfiguration</span>
<span class="p">{</span>
<span class="n">DataStorageConfiguration</span> <span class="p">=</span> <span class="k">new</span> <span class="n">DataStorageConfiguration</span>
<span class="p">{</span>
<span class="n">DefaultDataRegionConfiguration</span> <span class="p">=</span> <span class="k">new</span> <span class="n">DataRegionConfiguration</span>
<span class="p">{</span>
<span class="n">Name</span> <span class="p">=</span> <span class="s">"Default_Region"</span><span class="p">,</span>
<span class="n">InitialSize</span> <span class="p">=</span> <span class="m">100</span> <span class="p">*</span> <span class="m">1024</span> <span class="p">*</span> <span class="m">1024</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">};</span>
<span class="c1">// Start the node.</span>
<span class="kt">var</span> <span class="n">ignite</span> <span class="p">=</span> <span class="n">Ignition</span><span class="p">.</span><span class="nf">Start</span><span class="p">(</span><span class="n">cfg</span><span class="p">);</span></code></pre>
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</div></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock">
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<pre class="rouge highlight"><code>This API is not presently available for C++. You can use XML configuration.</code></pre>
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<div class="sect1">
<h2 id="adding-custom-data-regions">Adding Custom Data Regions</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In addition to the default data region, you can add more data regions with custom settings.
In the following example, we configure a data region that can take up to 40 MB and uses the <a href="/docs/2.9.0/memory-configuration/eviction-policies#random-2-lru">Random-2-LRU</a> eviction policy.
Note that further below in the configuration, we create a cache that resides in the new data region.</p>
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<code-tabs><code-tab data-tab='XML'><div class="listingblock">
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<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span> <span class="na">id=</span><span class="s">"ignite.cfg"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataStorageConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataStorageConfiguration"</span><span class="nt">&gt;</span>
<span class="c">&lt;!--
Default memory region that grows endlessly. Any cache will be bound to this memory region
unless another region is set in the cache's configuration.
--&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"defaultDataRegionConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataRegionConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"Default_Region"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- 100 MB memory region with disabled eviction. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"initialSize"</span> <span class="na">value=</span><span class="s">"#{100 * 1024 * 1024}"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataRegionConfigurations"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="c">&lt;!--
40MB memory region with eviction enabled.
--&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataRegionConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"40MB_Region_Eviction"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- Memory region of 20 MB initial size. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"initialSize"</span> <span class="na">value=</span><span class="s">"#{20 * 1024 * 1024}"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- Maximum size is 40 MB. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"maxSize"</span> <span class="na">value=</span><span class="s">"#{40 * 1024 * 1024}"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- Enabling eviction for this memory region. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"pageEvictionMode"</span> <span class="na">value=</span><span class="s">"RANDOM_2_LRU"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="c">&lt;!-- Cache that is mapped to a specific data region. --&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"SampleCache"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!--
Assigning the cache to the `40MB_Region_Eviction` region.
--&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataRegionName"</span> <span class="na">value=</span><span class="s">"40MB_Region_Eviction"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="c">&lt;!-- other properties --&gt;</span>
<span class="nt">&lt;/bean&gt;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>For the full list of properties, refer to the <a href="https://ignite.apache.org/releases/2.9.0/javadoc/org/apache/ignite/configuration/DataStorageConfiguration.html">DataStorageConfiguration</a> javadoc.</p>
</div></code-tab><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">DataStorageConfiguration</span> <span class="n">storageCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">DataStorageConfiguration</span><span class="o">();</span>
<span class="nc">DataRegionConfiguration</span> <span class="n">defaultRegion</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">DataRegionConfiguration</span><span class="o">();</span>
<span class="n">defaultRegion</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"Default_Region"</span><span class="o">);</span>
<span class="n">defaultRegion</span><span class="o">.</span><span class="na">setInitialSize</span><span class="o">(</span><span class="mi">100</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span><span class="o">);</span>
<span class="n">storageCfg</span><span class="o">.</span><span class="na">setDefaultDataRegionConfiguration</span><span class="o">(</span><span class="n">defaultRegion</span><span class="o">);</span>
<span class="c1">// 40MB memory region with eviction enabled.</span>
<span class="nc">DataRegionConfiguration</span> <span class="n">regionWithEviction</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">DataRegionConfiguration</span><span class="o">();</span>
<span class="n">regionWithEviction</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"40MB_Region_Eviction"</span><span class="o">);</span>
<span class="n">regionWithEviction</span><span class="o">.</span><span class="na">setInitialSize</span><span class="o">(</span><span class="mi">20</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span><span class="o">);</span>
<span class="n">regionWithEviction</span><span class="o">.</span><span class="na">setMaxSize</span><span class="o">(</span><span class="mi">40</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span><span class="o">);</span>
<span class="n">regionWithEviction</span><span class="o">.</span><span class="na">setPageEvictionMode</span><span class="o">(</span><span class="nc">DataPageEvictionMode</span><span class="o">.</span><span class="na">RANDOM_2_LRU</span><span class="o">);</span>
<span class="n">storageCfg</span><span class="o">.</span><span class="na">setDataRegionConfigurations</span><span class="o">(</span><span class="n">regionWithEviction</span><span class="o">);</span>
<span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span>
<span class="n">cfg</span><span class="o">.</span><span class="na">setDataStorageConfiguration</span><span class="o">(</span><span class="n">storageCfg</span><span class="o">);</span>
<span class="nc">CacheConfiguration</span> <span class="n">cache1</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">(</span><span class="s">"SampleCache"</span><span class="o">);</span>
<span class="c1">//this cache will be hosted in the "40MB_Region_Eviction" data region</span>
<span class="n">cache1</span><span class="o">.</span><span class="na">setDataRegionName</span><span class="o">(</span><span class="s">"40MB_Region_Eviction"</span><span class="o">);</span>
<span class="n">cfg</span><span class="o">.</span><span class="na">setCacheConfiguration</span><span class="o">(</span><span class="n">cache1</span><span class="o">);</span>
<span class="c1">// Start the node.</span>
<span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</span><span class="o">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C#/.NET'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="csharp"><span class="kt">var</span> <span class="n">cfg</span> <span class="p">=</span> <sp