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     <section class="innerhero innerhero--faq">
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           <h1 class="h1 innerhero__h1">Frequently Asked Questions <br />About Apache Ignite</h1>
           <div class="innerhero__descr pt-5 h4">
             Ignite’s rich feature set enables it for a myriad of use cases. <br />
             Is Ignite a cache, transactional database, key-value store? <br />Find the answers below.
           </div>
         </div>
         <img class="innerhero__pic innerhero__pic--faq" src="/img/faq/hero.svg" alt="Frequently asked questions" />
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     <section class="faqabout container">
       <div class="capstext">Apache Ignite FAQs</div>
       <div class="faqabout__wrap flexi pt-5">
         <div class="faqabout__left">
           <h2 class="h4 pb-2">What Is In-memory Computing?</h2>
           <p>In-memory computing is a software and data-processing technique that stores data sets in memory across a cluster of interconnected nodes. An average speed performance is 10-1000x faster than in disk-based systems.</p>
           <p>
             In-memory computing software includes a distributed in-memory store with APIs and libraries optimized for high-performance data processing. Each cluster node (physical or virtual machine) contributes its available memory space
             with CPU cores to the total capacity of the cluster.
           </p>
           <p>
             An application interacts with the cluster as a single unit, letting the in-memory computing software shield and manage all the internals related to inter-node communications, data distribution, and queries processing. The
             cluster scales linearly and horizontally to meet the data volume and throughput goals of the applications.
           </p>
         </div>
         <aside class="faqabout__right">
           <div class="faqabout__num h3">10-1000x</div>
           <p class="h5">performance increase</p>
           <div class="faqabout__rightbot h5">Unlimited horizontal scalability</div>
         </aside>
       </div>
     </section>
     <!-- /.faqabout-->
     <section class="faqfeats container">
       <div class="h4 faqfeats__title">Apache Ignite Belongs to&nbsp;The In-memory <br />Computing Category:</div>
       <div class="faqfeats__wrap flexi pt-5">
         <article class="faqfeat pt-1">
           <div class="faqfeat__iconwrap flexi"><img src="/img/faq/icon-faq1.svg" alt="" /></div>
           <div class="faqfeat__text pt-2">Build real-time and event-driven solutions that process data with in-memory speed</div>
         </article>
         <article class="faqfeat pt-1">
           <div class="faqfeat__iconwrap flexi"><img src="/img/faq/icon-faq2.svg" alt="" /></div>
           <div class="faqfeat__text pt-2">Scale up&nbsp;and out across available memory and disk capacity</div>
         </article>
         <article class="faqfeat pt-1">
           <div class="faqfeat__iconwrap flexi"><img src="/img/faq/icon-faq3.svg" alt="" /></div>
           <div class="faqfeat__text pt-2">Take advantage of&nbsp;built-in SQL, high-performance computing and real-time processing APIs</div>
         </article>
       </div>
     </section>
     <!-- /.faqfeats-->
     <section class="faqboxs container">
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite a Distributed Cache?</div>
         <div class="faqbox__anwser h5 pt-3">Yes</div>
         <div class="faqbox__text pt-3">
           <p>When Ignite native persistence is&nbsp;disabled, Ignite can function as&nbsp;a&nbsp;distributed in-memory cache with support distributed ACID&nbsp;transactions, SQL queries, high-performance computing APIs, and more.</p>
         </div>
         <div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-cache.html">Learn more: In-Memory Cache</a></div>
       </article>
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite a Distributed Database?</div>
         <div class="faqbox__anwser h5 pt-3">Yes</div>
         <div class="faqbox__text pt-3">
           <p>Ignite is&nbsp;a&nbsp;distributed database for high-performance computing with in-memory speed.</p>
           <p>Data in&nbsp;Ignite is&nbsp;stored in-memory and/or on-disk, and is&nbsp;either partitioned or&nbsp;replicated across a&nbsp;cluster of&nbsp;multiple nodes. This provides scalability, performance, and resiliency.</p>
         </div>
         <div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-database.html ">Learn more: Distributed Database</a></div>
       </article>
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite an In-memory Database?</div>
         <div class="faqbox__anwser h5 pt-3">Yes</div>
         <div class="faqbox__text pt-3">
           <p>
             Ignite multi-tier storage supports both in-memory and disk tiers. You can always disable the native persistence and use Ignite as&nbsp;a&nbsp;distributed in-memory database, with support for SQL, transactions and other APIs.
           </p>
         </div>
         <div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-database.html">Learn more: In-Memory Database</a></div>
       </article>
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite an In-memory Data Grid?</div>
         <div class="faqbox__anwser h5 pt-3">Yes</div>
         <div class="faqbox__text pt-3">
           <p>Ignite is&nbsp;a&nbsp;full-featured distributed data grid. As&nbsp;a&nbsp;grid, Ignite can automatically integrate with and accelerate any 3rd party databases, including any RDBMS or&nbsp;NoSQL stores.</p>
         </div>
         <div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-data-grid.html">Learn more: In-Memory Data Grid</a></div>
       </article>
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite an SQL Database?</div>
         <div class="faqbox__anwser h5 pt-3">Not fully</div>
         <div class="faqbox__text pt-3">
           <p>Although Ignite supports SQL natively, there are differences in&nbsp;how Ignite handles constraints and indexes.</p>
           <p>Ignite supports primary and secondary indexes, however the uniqueness can only be&nbsp;enforced for the primary indexes. Ignite also does not support foreign key constraints at&nbsp;the moment.</p>
         </div>
         <div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-database.html">Learn more: SQL Database</a></div>
       </article>
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite a Disk- or Memory-Only Storage?</div>
         <div class="faqbox__anwser h5 pt-3">Both</div>
         <div class="faqbox__text pt-3">
           <p>Native persistence in&nbsp;Ignite can be&nbsp;turned on&nbsp;and off. This allows Ignite to&nbsp;store data sets bigger than can fit in&nbsp;the available memory.</p>
           <p>
             Essentially, smaller operational data sets can be&nbsp;stored in-memory only, and larger data sets that do&nbsp;not fit in&nbsp;memory can be&nbsp;stored on&nbsp;disk, using memory as&nbsp;a&nbsp;caching layer for better
             performance.
           </p>
         </div>
         <div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/arch/native-persistence.html">Learn more: Native Persistence</a></div>
       </article>
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite a NoSQL Database?</div>
         <div class="faqbox__anwser h5 pt-3">Not exactly</div>
         <div class="faqbox__text pt-3">
           <p>Just like other NoSQL databases, Ignite is&nbsp;highly available and horizontally scalable.</p>
           <p>However, unlike other NoSQL databases, Ignite supports SQL and ACID transactions across multiple cluster nodes.</p>
         </div>
       </article>
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite a Transactional Database?</div>
         <div class="faqbox__anwser h5 pt-3">Not fully</div>
         <div class="faqbox__text pt-3">
           <p>
             ACID Transactions are supported, but only at&nbsp;key-value API level. Ignite also supports cross-partition transactions, which means that transactions can span keys residing in&nbsp;different partitions on&nbsp;different
             servers.
           </p>
           <p>
             At&nbsp;SQL level, Ignite supports atomic, but not yet transactional consistency. SQL transactions implementation is&nbsp;already
             <a href="https://cwiki.apache.org/confluence/display/IGNITE/IEP-3%3A+Transactional+SQL" target="_blank">in&nbsp;the works</a> and will be&nbsp;released in&nbsp;Ignite&nbsp;3.
           </p>
         </div>
         <div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/features/acid-transactions.html">Learn more: ACID Transactions</a></div>
       </article>
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite a Multi-Model Database?</div>
         <div class="faqbox__anwser h5 pt-3">Yes</div>
         <div class="faqbox__text pt-3">
           <p>Ignite supports both key-value and SQL for modelling and accessing data.</p>
           <p>In&nbsp;addition, Ignite provides strong processing APIs for computing on&nbsp;distributed data.</p>
         </div>
         <div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-database.html">Learn more: In-Memory Database</a></div>
       </article>
       <article class="faqbox cardsimple">
         <div class="faqbox__itemtitle h5">Is Ignite a Key-Value Store?</div>
         <div class="faqbox__anwser h5 pt-3">Yes</div>
         <div class="faqbox__text pt-3"><p>Ignite provides a&nbsp;feature-rich key-value API, that is&nbsp;JCache (JSR-107) compliant and supports Java, C++, .NET, and other programming languages.</p></div>
         <div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/key-value-store.html">Learn more: Distributed Key-Value Store</a></div>
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	<h1 class="h1 innerhero__h1">Frequently Asked Questions <br />About Apache Ignite</h1>
	<div class="innerhero__descr pt-5 h4">
	Ignite’s rich feature set enables it for a myriad of use cases. <br />
	Is Ignite a cache, transactional database, key-value store? <br />Find the answers below.
	</div>
	</div>
	<img class="innerhero__pic innerhero__pic--faq" src="/img/faq/hero.svg" alt="Frequently asked questions" />
	</div>
	</section>
	<!-- /.innerhero-->
	<section class="faqabout container">
	<div class="capstext">Apache Ignite FAQs</div>
	<div class="faqabout__wrap flexi pt-5">
	<div class="faqabout__left">
	<h2 class="h4 pb-2">What Is In-memory Computing?</h2>
	<p>In-memory computing is a software and data-processing technique that stores data sets in memory across a cluster of interconnected nodes. An average speed performance is 10-1000x faster than in disk-based systems.</p>
	<p>
	In-memory computing software includes a distributed in-memory store with APIs and libraries optimized for high-performance data processing. Each cluster node (physical or virtual machine) contributes its available memory space
	with CPU cores to the total capacity of the cluster.
	</p>
	<p>
	An application interacts with the cluster as a single unit, letting the in-memory computing software shield and manage all the internals related to inter-node communications, data distribution, and queries processing. The
	cluster scales linearly and horizontally to meet the data volume and throughput goals of the applications.
	</p>
	</div>
	<aside class="faqabout__right">
	<div class="faqabout__num h3">10-1000x</div>
	<p class="h5">performance increase</p>
	<div class="faqabout__rightbot h5">Unlimited horizontal scalability</div>
	</aside>
	</div>
	</section>
	<!-- /.faqabout-->
	<section class="faqfeats container">
	<div class="h4 faqfeats__title">Apache Ignite Belongs to The In-memory <br />Computing Category:</div>
	<div class="faqfeats__wrap flexi pt-5">
	<article class="faqfeat pt-1">
	<div class="faqfeat__iconwrap flexi"><img src="/img/faq/icon-faq1.svg" alt="" /></div>
	<div class="faqfeat__text pt-2">Build real-time and event-driven solutions that process data with in-memory speed</div>
	</article>
	<article class="faqfeat pt-1">
	<div class="faqfeat__iconwrap flexi"><img src="/img/faq/icon-faq2.svg" alt="" /></div>
	<div class="faqfeat__text pt-2">Scale up and out across available memory and disk capacity</div>
	</article>
	<article class="faqfeat pt-1">
	<div class="faqfeat__iconwrap flexi"><img src="/img/faq/icon-faq3.svg" alt="" /></div>
	<div class="faqfeat__text pt-2">Take advantage of built-in SQL, high-performance computing and real-time processing APIs</div>
	</article>
	</div>
	</section>
	<!-- /.faqfeats-->
	<section class="faqboxs container">
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite a Distributed Cache?</div>
	<div class="faqbox__anwser h5 pt-3">Yes</div>
	<div class="faqbox__text pt-3">
	<p>When Ignite native persistence is disabled, Ignite can function as a distributed in-memory cache with support distributed ACID transactions, SQL queries, high-performance computing APIs, and more.</p>
	</div>
	<div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-cache.html">Learn more: In-Memory Cache</a></div>
	</article>
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite a Distributed Database?</div>
	<div class="faqbox__anwser h5 pt-3">Yes</div>
	<div class="faqbox__text pt-3">
	<p>Ignite is a distributed database for high-performance computing with in-memory speed.</p>
	<p>Data in Ignite is stored in-memory and/or on-disk, and is either partitioned or replicated across a cluster of multiple nodes. This provides scalability, performance, and resiliency.</p>
	</div>
	<div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-database.html ">Learn more: Distributed Database</a></div>
	</article>
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite an In-memory Database?</div>
	<div class="faqbox__anwser h5 pt-3">Yes</div>
	<div class="faqbox__text pt-3">
	<p>
	Ignite multi-tier storage supports both in-memory and disk tiers. You can always disable the native persistence and use Ignite as a distributed in-memory database, with support for SQL, transactions and other APIs.
	</p>
	</div>
	<div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-database.html">Learn more: In-Memory Database</a></div>
	</article>
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite an In-memory Data Grid?</div>
	<div class="faqbox__anwser h5 pt-3">Yes</div>
	<div class="faqbox__text pt-3">
	<p>Ignite is a full-featured distributed data grid. As a grid, Ignite can automatically integrate with and accelerate any 3rd party databases, including any RDBMS or NoSQL stores.</p>
	</div>
	<div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-data-grid.html">Learn more: In-Memory Data Grid</a></div>
	</article>
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite an SQL Database?</div>
	<div class="faqbox__anwser h5 pt-3">Not fully</div>
	<div class="faqbox__text pt-3">
	<p>Although Ignite supports SQL natively, there are differences in how Ignite handles constraints and indexes.</p>
	<p>Ignite supports primary and secondary indexes, however the uniqueness can only be enforced for the primary indexes. Ignite also does not support foreign key constraints at the moment.</p>
	</div>
	<div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-database.html">Learn more: SQL Database</a></div>
	</article>
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite a Disk- or Memory-Only Storage?</div>
	<div class="faqbox__anwser h5 pt-3">Both</div>
	<div class="faqbox__text pt-3">
	<p>Native persistence in Ignite can be turned on and off. This allows Ignite to store data sets bigger than can fit in the available memory.</p>
	<p>
	Essentially, smaller operational data sets can be stored in-memory only, and larger data sets that do not fit in memory can be stored on disk, using memory as a caching layer for better
	performance.
	</p>
	</div>
	<div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/arch/native-persistence.html">Learn more: Native Persistence</a></div>
	</article>
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite a NoSQL Database?</div>
	<div class="faqbox__anwser h5 pt-3">Not exactly</div>
	<div class="faqbox__text pt-3">
	<p>Just like other NoSQL databases, Ignite is highly available and horizontally scalable.</p>
	<p>However, unlike other NoSQL databases, Ignite supports SQL and ACID transactions across multiple cluster nodes.</p>
	</div>
	</article>
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite a Transactional Database?</div>
	<div class="faqbox__anwser h5 pt-3">Not fully</div>
	<div class="faqbox__text pt-3">
	<p>
	ACID Transactions are supported, but only at key-value API level. Ignite also supports cross-partition transactions, which means that transactions can span keys residing in different partitions on different
	servers.
	</p>
	<p>
	At SQL level, Ignite supports atomic, but not yet transactional consistency. SQL transactions implementation is already
	<a href="https://cwiki.apache.org/confluence/display/IGNITE/IEP-3%3A+Transactional+SQL" target="_blank">in the works</a> and will be released in Ignite 3.
	</p>
	</div>
	<div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/features/acid-transactions.html">Learn more: ACID Transactions</a></div>
	</article>
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite a Multi-Model Database?</div>
	<div class="faqbox__anwser h5 pt-3">Yes</div>
	<div class="faqbox__text pt-3">
	<p>Ignite supports both key-value and SQL for modelling and accessing data.</p>
	<p>In addition, Ignite provides strong processing APIs for computing on distributed data.</p>
	</div>
	<div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/in-memory-database.html">Learn more: In-Memory Database</a></div>
	</article>
	<article class="faqbox cardsimple">
	<div class="faqbox__itemtitle h5">Is Ignite a Key-Value Store?</div>
	<div class="faqbox__anwser h5 pt-3">Yes</div>
	<div class="faqbox__text pt-3"><p>Ignite provides a feature-rich key-value API, that is JCache (JSR-107) compliant and supports Java, C++, .NET, and other programming languages.</p></div>
	<div class="cardsimple__bottom"><a class="cardsimple__button button button--shadow" href="/use-cases/key-value-store.html">Learn more: Distributed Key-Value Store</a></div>
	</article>
	</section>
	<!-- /.faqboxs-->
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