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<h1 class="h1 innerhero__h1">Distributed <br />In-Memory Cache<br /><span class="with-apache">With Apache Ignite</span></h1>
<div class="innerhero__descr pt-2 h5">
Improve the performance and scalability of&nbsp;your applications, <br />
databases, and microservices with Apache Ignite
</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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</section>
<!-- /.innerhero-->
<section class="inmememor1 container">
<header class="blockheader blockheader--spl flexi">
<h2 class="capstext pb-3">What Is In-Memory Cache</h2>
<div class="inmememor1__text">
<p>In-memory cache is&nbsp;a&nbsp;storage layer placed between applications and databases. The cache keeps your hot data in&nbsp;memory to&nbsp;offload existing databases and accelerate applications.</p>
</div>
</header>
</section>
<!-- /.inmememor1-->
<section class="inmememor-adv">
<div class="container">
<header class="blockheader blockheader--spl flexi">
<h2 class="h4">Advantages of Distributed In-Memory Cache</h2>
<div class="blockheader__right fz20">A distributed in-memory cache is <strong>the most straightforward and scalable</strong> way to accelerate your existing applications and databases, thanks to:</div>
</header>
<div class="inmememor-adv__wrap">
<div class="inmememor-adv__item">
<h3 class="h4">Speed</h3>
<div class="inmememor-adv__text">Memory as a storage layer provides the&nbsp;lowest latency and highest throughput. Laws of physics.</div>
</div>
<div class="inmememor-adv__item">
<h3 class="h4">Scale</h3>
<div class="inmememor-adv__text">Horizontal scalability lets you grow the&nbsp;cluster unlimitedly to accommodate <br />data size and throughput.</div>
</div>
</div>
</div>
</section>
<!-- /.inmememor-adv-->
<section class="inmememor-api container">
<header class="blockheader blockheader--spl flexi">
<h2 class="h4 blockheader__left blockheader__left--full">Unlike Standard In-Memory Caches, Apache Ignite <br />Supports Essential Developers APIs</h2>
</header>
<div class="inmememor-api__wrap flexi">
<div class="inmememor-api__item">
<img class="inmememor-api__icon" src="/img/features/in-memory/01-ACID-Transactions.svg" alt="" />
<p class="fz20 pt-3">ACID transactions <br />to&nbsp;ensure consistency <br />of&nbsp;data</p>
</div>
<div class="inmememor-api__item">
<img class="inmememor-api__icon" src="/img/features/in-memory/02-sql.svg" alt="" />
<p class="fz20 pt-3">SQL queries execution</p>
</div>
<div class="inmememor-api__item">
<img class="inmememor-api__icon" src="/img/features/in-memory/03-user.svg" alt="" />
<p class="fz20 pt-3">Custom computations, <br />e.g. on Java, available</p>
</div>
</div>
</section>
<!-- /.inmememor-api-->
<section class="inmememor2 container">
<h2 class="h4">Read-Through / Write-Through Caching</h2>
<p class="fz20 pt-5"><strong>How It Works</strong></p>
<div class="inmememor2__work flexi pt-2">
<div class="inmememor2__left">
<p>
<em>The read-through/write-through caching strategy can be <br />classified as&nbsp;an&nbsp;in-memory, data-grid type of&nbsp;deployment.</em>
</p>
</div>
<div class="inmememor2__right">
<p>When Apache Ignite is&nbsp;deployed as&nbsp;a&nbsp;data grid, the application layer begins to&nbsp;treat Ignite as&nbsp;the primary store.</p>
<p>As&nbsp;applications write to&nbsp;and read from the data grid, Ignite ensures that all underlying external databases stay updated and are consistent with the in-memory data.</p>
</div>
</div>
<div class="inmememor2__picwrap">
<picture
><source media="(min-width: 1024px)" srcset="/img/features/in-memory/write-through-caching.svg" sizes="" />
<img src="/img/features/in-memory/write-through-caching-mob.svg" alt=""
/></picture>
</div>
<p class="fz20"><strong>How It Works</strong></p>
<div class="inmememor2__work flexi pt-3">
<div class="inmememor2__left inmememor2__left--icon">
<p>This strategy is recommended for architectures that need to:</p>
<ul class="dashlist pt-1">
<li>accelerate disk-based databases;</li>
<li>create a shared caching layer across various data sources.</li>
</ul>
</div>
<div class="inmememor2__right">
<p>Ignite integrates with many databases out-of-the-box and, in&nbsp;write-through or&nbsp;write-behind mode, can synchronize all changes to&nbsp;the databases.</p>
<p>The strategy also applies to&nbsp;ACID&nbsp;transactions: Ignite will coordinate and commit a&nbsp;transaction across its in-memory cluster as&nbsp;well as&nbsp;to&nbsp;a&nbsp;relational database.</p>
<p>Read-through capability implies that, if&nbsp;a&nbsp;record is&nbsp;missing from memory, a&nbsp;cache can read the data from an&nbsp;external database. Ignite fully supports this capability for key-value APIs.</p>
<p>When you use Ignite SQL, you must preload the dataset into memory&mdash;because Ignite SQL can query on-disk data only if&nbsp;the data is&nbsp;stored in&nbsp;native persistence.</p>
</div>
</div>
</section>
<!-- /.inmememor2-->
<section class="inmememor3 container pt-5">
<h2 class="h4">Cache-Aside Deployment</h2>
<div class="inmememor2__picwrap">
<picture
><source media="(min-width: 1024px)" srcset="/img/features/in-memory/cache-aside-deployment.svg" sizes="" />
<img src="/img/features/in-memory/cache-aside-deployment-mob.svg" alt=""
/></picture>
</div>
<p class="fz20 pt-3"><strong>When It Works</strong></p>
<div class="inmememor2__work flexi pt-3">
<div class="inmememor2__left">
<p>This strategy works well in two cases:</p>
<ul class="pt-1">
<li>1. The cached data is relatively static, i.e. not updated frequently</li>
<li>2. A temporary data lag is allowed between the primary store and the cache</li>
</ul>
</div>
<div class="inmememor2__right">
<p>It&rsquo;s usually assumed that changes will be&nbsp;fully replicated eventually and, <br />thus, the cache and the primary store will become consistent.</p>
</div>
</div>
<div class="inmememor3__bottom">
<h3 class="fz20">Cach-Aside Deployment And Native Persistence</h3>
<div class="inmememor3__botwrap flexi pt-3">
<div class="inmememor2__left">
<p>
When Apache Ignite is&nbsp;deployed in&nbsp;a&nbsp;cache-aside configuration, its native persistence can be&nbsp;used as&nbsp;a&nbsp;disk store for Ignite datasets.
<a href="/arch/native-persistence.html">Native persistence</a> allows for elimination of&nbsp;the time-consuming cache warm-up step.
</p>
<p>
As&nbsp;native persistence maintains a&nbsp;full copy of&nbsp;data on&nbsp;disk, you can cache a&nbsp;subset of&nbsp;records in&nbsp;memory. If&nbsp;a&nbsp;required data record is&nbsp;missing from memory, then Ignite reads
the record from the disk automatically, regardless of&nbsp;which API you use&nbsp;&mdash; whether SQL, key-value, or&nbsp;scan queries.
</p>
</div>
<div class="inmememor2__right">
<ul class="inmememor3__checklist">
<li>Seconds needed for recovery</li>
<li>Full copy of cached records is duplicated on disk</li>
<li>Use any API: SQL, key-value, or scan queries</li>
</ul>
</div>
</div>
</div>
</section>
<!-- /.inmememor3-->
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<h2 class="capstext pt-5">IN-MEMORY CACHE USER STORIES</h2>
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<a class="comvideo__screen" href="https://www.youtube.com/watch?v=Mhtt2QL_qCQ" data-youtube="data-youtube"
><span class="comvideo__txt hub5__video comvideo__txt--black">How To&nbsp;Use Apache Ignite To&nbsp;Rescue The Backend Of&nbsp;A&nbsp;Bank</span><img src="/img/poweredby/videos/002.png" alt=""
/></a>
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