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<div class="innerhero__pre pb-3">Apache Ignite</div>
<h1 class="h1 innerhero__h1">Native Persistence</h1>
<div class="innerhero__descr pt-2 h5">
Scale beyond available memory capacity <br />
and skip memory warm-ups on restarts
</div>
<div class="innerhero__action"><a class="button innerhero__button" href="https://ignite.apache.org/docs/latest/index">Start Coding</a></div>
</div>
<img class="innerhero__pic innerhero__pic--native" src="/img/features/native-header.svg" alt="Native Persistence" />
</div>
</section>
<!-- /.innerhero-->
<section class="native1 container flexi">
<div class="native1__block native1__block--bad">
<img class="native1__icon" src="/img/features/smile-doesnt-have.svg" alt="" />
<div class="native1__title fz20 pt-1x">Usually, in-memory caches and databases provide limited persistence capabilities.</div>
<p class="pt-2">For instance, some solutions create a backup copy of <br />the in-memory data purely for restart purposes.</p>
</div>
<div class="native1__block">
<img class="native1__icon" src="/img/features/smile-done.svg" alt="" />
<div class="native1__title fz20 pt-1x">
Ignite persistence doesn’t have any limitations. <br />
Our native persistence behaves like a classic <br />disk-based database.
</div>
</div>
</section>
<section class="native2 container">
<div class="native2__grid">
<article class="native2item">
<h3 class="fz20 native2item__title">Scale beyond memory <br />capacity</h3>
<p class="pt-1x">100% of&nbsp;data is&nbsp;always stored on&nbsp;disk. You decide how much memory to allocate to&nbsp;your data.</p>
</article>
<article class="native2item">
<h3 class="fz20 native2item__title">Just seconds needed <br />for recovery</h3>
<p class="pt-1x">Ignite becomes operational from disk instantaneously. There is&nbsp;no&nbsp;need to&nbsp;wait for the data to&nbsp;get preloaded on&nbsp;restarts.</p>
</article>
<article class="native2item">
<h3 class="fz20 native2item__title">Query in-memory <br />and on-disk data</h3>
<p class="pt-1x">If&nbsp;any record is&nbsp;missing in&nbsp;memory, then Ignite reads it&nbsp;from disk. This is&nbsp;supported for all the APIs including SQL.</p>
</article>
</div>
</section>
<section class="native-howwork container">
<div class="native-howwork__wrap flexi">
<div class="native-howwork__left">
<h3 class="h5">How it works</h3>
<div class="native-howwork__text pt-1">
<p>
The native persistence functions as&nbsp;a&nbsp;distributed, ACID, and SQL-compliant disk-based store. It&nbsp;integrates into the Ignite <a href="/features/multi-tier-storage.html">multi-tier storage</a> as&nbsp;a&nbsp;disk
tier.
</p>
<p class="pt-1">When the native persistence is enabled, Ignite stores a&nbsp;superset of&nbsp;data on&nbsp;disk and caches as&nbsp;much as&nbsp;it&nbsp;can in&nbsp;memory.</p>
</div>
</div>
<div class="native-howwork__right">
<p>For example</p>
<p class="pt-1x">
If&nbsp;your application needs to&nbsp;store 200 records in&nbsp;an&nbsp;Ignite cluster and the memory capacity allows caching only 150&nbsp;records, then all 200 will be&nbsp;stored on&nbsp;disk, out of&nbsp;which 150 will
be&nbsp;served from memory while the rest 50&nbsp;records from disk whenever the application requests them.
</p>
</div>
</div>
</section>
<section class="native-points container">
<h2 class="h4">Checkpointing And Write-Ahead Logging <br />Ensure Durability And Consistency Of&nbsp;Data</h2>
<div class="native-points__grid pt-5">
<div class="native-points__item fz20"><p>Committed transactions always survive failures</p></div>
<div class="native-points__item fz20"><p>The cluster can always be&nbsp;recovered to&nbsp;the latest successfully committed transaction</p></div>
</div>
</section>
<section class="native-steps">
<div class="container">
<h2 class="h4">Three-Step Process To&nbsp;Update Your Data <br />At&nbsp;In-Memory Speed But Not Losing A&nbsp;Bit</h2>
<img class="native-steps__pic" src="/img/features/native-stepspic.svg" alt="" />
<div class="native-steps__grid">
<article class="nativestepitem">
<i class="fz20 pb-1x">01</i>
<div class="nativestepitem__text">
<p>
As&nbsp;soon as&nbsp;the update comes from the application side, a&nbsp;record is&nbsp;updated in&nbsp;memory. Then, the change is&nbsp;added
<a href="https://ignite.apache.org/docs/latest/persistence/native-persistence.html#write-ahead-log">to&nbsp;the write-ahead log (WAL).</a>
</p>
<p>The purpose is&nbsp;to&nbsp;propagate updates to&nbsp;disk in&nbsp;the fastest way possible and provide a&nbsp;consistent recovery mechanism that remediates full cluster failures.</p>
</div>
</article>
<article class="nativestepitem">
<i class="fz20 pb-1x">02</i>
<div class="nativestepitem__text">
<p>As&nbsp;the WAL grows, it&nbsp;periodically gets checkpointed to&nbsp;the main storage.</p>
<p>
<a href="https://ignite.apache.org/docs/latest/persistence/native-persistence.html#checkpointing">Checkpointing</a> is&nbsp;the process of&nbsp;copying dirty pages from the memory tier to&nbsp;the partition files
on&nbsp;disk.
</p>
<p class="nativestepitem__small">A dirty page is a page that has been updated in&nbsp;memory and appended to the WAL, but has not yet been written to&nbsp;the respective partition file on disk.</p>
</div>
</article>
<article class="nativestepitem">
<i class="fz20 pb-1x">03</i>
<div class="nativestepitem__text">
<p>After a&nbsp;while, the information about updates in&nbsp;WAL can be&nbsp;removed, compressed or&nbsp;moved to&nbsp;archive.</p>
<p>So&nbsp;you can reuse your disk space.</p>
</div>
</article>
</div>
</div>
</section>
<section class="nativecode container jsTabWrap">
<header class="blockheader blockheader--spl flexi">
<h2 class="h4 blockheader__left">You Decide Which Data To Persist</h2>
<div class="blockheader__right fz20">
<p>Toggle a&nbsp;single configuration setting to&nbsp;turn a&nbsp;cluster into a&nbsp;database <br />that scales across memory and disk</p>
</div>
</header>
<div class="nativecode__tabctrls flexi">
<a class="nativecode__link active" href="#" data-tablink="nativeTabXML">XML</a><a class="nativecode__link" href="#" data-tablink="nativeTabJava">Java</a><a class="nativecode__link" href="#" data-tablink="nativeTabNET">C#/.NET</a>
</div>
<div class="nativecode__tabs">
<div class="nativecode__tab active" data-tab="nativeTabXML">
<pre class="nativecode__codebox"> <code class="xml">&lt;bean class="org.apache.ignite.configuration.IgniteConfiguration"&gt;
&lt;property name="dataStorageConfiguration"&gt;
&lt;bean class="org.apache.ignite.configuration.DataStorageConfiguration"&gt;
&lt;property name="defaultDataRegionConfiguration"&gt;
&lt;bean class="org.apache.ignite.configuration.DataRegionConfiguration"&gt;
&lt;property name="persistenceEnabled" value="true"/&gt;
&lt;/bean&gt;
&lt;/property&gt;
&lt;/bean&gt;
&lt;/property&gt;
&lt;/bean&gt;</code></pre>
</div>
<div class="nativecode__tab" data-tab="nativeTabJava">
<pre class="nativecode__codebox"> <code class="java">IgniteConfiguration cfg = new IgniteConfiguration();
DataStorageConfiguration storageCfg = new DataStorageConfiguration();
// Enable Ignite Persistence
storageCfg.getDefaultDataRegionConfiguration().setPersistenceEnabled(true);
// Using the new storage configuration
cfg.setDataStorageConfiguration(storageCfg);</code></pre>
</div>
<div class="nativecode__tab" data-tab="nativeTabNET">
<pre class="nativecode__codebox"> <code class="csharp">var cfg = new IgniteConfiguration
{
DataStorageConfiguration = new DataStorageConfiguration
{
DefaultDataRegionConfiguration = new DataRegionConfiguration
{
Name = "Default_Region",
PersistenceEnabled = true
}
}
};</code></pre>
</div>
</div>
</section>
<!-- /.nativecode-->
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<div class="native-bottom__grid">
<article class="nativebotblock">
<div class="h4 nativebotblock__title"><img class="nativebotblock__icon" src="/img/features/native-rocket.svg" alt="" /><span>Ready to Start?</span></div>
<p class="nativebotblock__text">Discover more details about native persistence <br />and configure it&nbsp;for your use-case</p>
<a class="nativebotblock__link arrowlink" href="https://ignite.apache.org/docs/latest/persistence/native-persistence" target="_blank">Native Persistence Usage and Configuration</a>
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