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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. |
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| <!-- /.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> |
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