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<div class="innerhero__pre pb-5">Apache Ignite</div>
<h1 class="h1 innerhero__h1">Distributed <br />Key-Value APIs</h1>
<div class="innerhero__descr pt-2 h5">Query your distributed data in the fastest way possible <br />with key-value APIs</div>
<div class="innerhero__action"><a class="button innerhero__button" href="https://ignite.apache.org/docs/latest/index">Start Coding</a></div>
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<img class="innerhero__pic innerhero__pic--keyvalue" src="/img/features/key-value/hero.svg" alt="Distributed Key-Value APIs" />
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<section class="keyvalue1 container flexi">
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<h2 class="capstext">Key-Value APIs Overview</h2>
<div class="keyvaluetext pt-5">
<p>
Every record in Ignite is stored as a key-value pair. All the records are distributed evenly across the cluster nodes. Your key-value queries are directed automatically to the nodes that store requested data. This is how Ignite
utilizes all the given memory, disk, and CPU resources.
</p>
<p>Key-value APIs are supported by all existing Ignite client libraries:</p>
</div>
<div class="keyvalue1__libs pt-5">
<p class="h5 leyvalue__lang">Java <small>(implements JSR-107 specification known as JCache)</small></p>
<p class="h5 leyvalue__lang">.NET</p>
<p class="h5 leyvalue__lang">Python</p>
<p class="h5 leyvalue__lang">Node.JS</p>
<p class="h5 leyvalue__lang">Your language</p>
</div>
</div>
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<div class="keyvalue1__picwrap picwrap"><img class="keyvalue1__pic" src="/img/features/key-value/key-value-api-pic.svg" alt="" /></div>
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<section class="keyvalueplank container">
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Apache Ignite key-value APIs provide additional capabilities such as&nbsp;<strong>automatic synchronization</strong> with external databases, <strong>near caching</strong> and <strong>ACID transactions.</strong>
</div>
</section>
<section class="keyvalue2 container flexi">
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<h3 class="keyvalue__title">Automatic Synchronization With External <br />Databases To Keep A Consistent Copy Of Data</h3>
<div class="keyvaluetext pt-2 pb-5">
<p>Two synchronization strategies are available in Apache Ignite: <br />write-through/behind and read-through.</p>
</div>
<dl class="keyvalue2__box pb-2">
<dt>Write-through and write-behind capabilities</dt>
<dd class="pt-2">Ignite can automatically write-through or&nbsp;write-behind all the changes to&nbsp;an&nbsp;external database for every key-value request issued by&nbsp;your applications.</dd>
</dl>
<dl class="keyvalue2__box">
<dt>Read-through capabilities</dt>
<dd>Read-through means that Ignite can automatically load data from an&nbsp;external database if&nbsp;a&nbsp;record is&nbsp;missing in&nbsp;memory.</dd>
</dl>
</div>
<div class="keyvalue2__right">
<div class="keyvalue2__picwrap picwrap"><img class="keyvalue2__pic" src="/img/features/key-value/key-value-api-2.svg" alt="" /></div>
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<!-- /.keyvalue2-->
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<h3 class="keyvalue__title">Near Cache To Process Your Requests In&nbsp;Microseconds</h3>
<div class="keyvaluetext pt-2 pb-5">
<p>A near cache is a local client-side cache that stores the most frequently <br />used data on the application end.</p>
</div>
<div class="keyvalue__title">How it works</div>
<div class="keyvaluetext pt-2 pb-5">
<p>It is applied to applications that require a consistent response time of a few <strong>microseconds.</strong> Ignite automatically invalidates and updates the near cache.</p>
<p>
Whenever the primary copy of&nbsp;a&nbsp;record gets updated on&nbsp;a&nbsp;server node, Ignite propagates the change to&nbsp;all the nodes that store the record&rsquo;s backup copy, as&nbsp;well as&nbsp;to&nbsp;the applications
that keep the record&rsquo;s copy in&nbsp;their near caches.
</p>
</div>
</div>
<div class="keyvalue3__left">
<div class="keyvalue3__picwrap picwrap">
<img class="keyvalue3__pic" src="/img/features/key-value/key-value-api-3.svg" alt="" />
<div class="keyvalue3__picdescr">
<p>1. Call to the near cache</p>
<p>2. Call to the Ignite cluster <span>(if a record is not found in the near cache)</span></p>
<p>3. Read-through from the external database<span>(if the record is not in the Ignite cluster yet)</span></p>
</div>
</div>
</div>
</section>
<!-- /.keyvalue3-->
<section class="keyvalue4 container flexi pb-1">
<div class="keyvalue4__left">
<h3 class="keyvalue__title">ACID Transactions To Update Your Distributed Records Consistently</h3>
<div class="keyvaluetext pt-2 pb-5"><p>Apache Ignite key-value APIs are fully transactional, which means that data can be&nbsp;updated consistently and reliably.</p></div>
<div class="keyvalue__title">How it works</div>
<div class="keyvaluetext pt-2 pb-5">
<p>
An&nbsp;Ignite transaction can update multiple records from different tables stored on&nbsp;different cluster nodes. Ignite can even span a&nbsp;transaction to&nbsp;an&nbsp;underlying relational database. Ignite implements
<a href="/features/acid-transactions.html">two-phase-commit protocol to&nbsp;ensure data consistency at&nbsp;scale.</a>
</p>
</div>
</div>
<div class="keyvalue4__right">
<div class="keyvalue4__picwrap picwrap"><img class="keyvalue4__pic" src="/img/features/key-value/key-value-api-4.svg" alt="" /></div>
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<p class="nativebotblock__text">Create your first application using <br />Ignite key-value APIs</p>
<a class="nativebotblock__link arrowlink" href="https://ignite.apache.org/docs/latest/key-value-api/basic-cache-operations" target="_blank">Using Key-Value APIs</a>
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<p class="nativebotblock__text">Check out how Apache Ignite can be configured <br />and used as a standard key-value store</p>
<a class="nativebotblock__link arrowlink" href="/use-cases/key-value-store.html">Key-Value Store</a>
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