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          content="Apache Ignite, as an in-memory database, is a high-performant system-of-records that is capable of
          storing and querying large data sets from memory as well as disk without requiring to warm up the memory tier
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            <h1><strong>In-Memory Database</strong> With Apache Ignite</h1>
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        <p>
            Apache Ignite® is a distributed in-memory database that scales horizontally across memory and disk tiers.
            Ignite supports ACID transactions, ANSI-99 SQL, key-value, compute, machine learning, and other data
            processing APIs. As a database, Ignite uses memory, disk or Intel® Optane™ as active storage tiers and
            removes the need to cache all the data and the need for memory warm-ups.
        </p>
        <img class="diagram-right img-responsive" src="/images/svg-diagrams/database.svg" alt="In-Memory Database diagram" />


        <h2>Multi-Tier Storage</h2>
        <p>
            Apache Ignite works with memory, disk, and Intel Optane as active storage tiers. This architecture combines,
            in one system, the advantages of in-memory computing with disk durability and strong consistency.
        </p>
        <p>
            When the native persistence is enabled, Ignite allows you to control the amount of memory it should
            consume. Depending on the memory space available, Ignite either caches the full data set in memory or
            keeps only the most frequently used data there and retrieves missing records from disk when needed.
            For instance, if there are 100 records and the memory of your system can accommodate only 20 of them,
            then all 100 records will be stored on disk and only 20 records will be cached in memory for better
            performance.
        </p>

        <p>
            The following are the primary advantages of Ignite memory management architecture:
        </p>
        <ul class="page-list">
            <li>
                Multi-tiered storage - Ignite treats disk as an active storage layer allowing to
                cache a subset of the data in memory and query both in-memory and disk-only records with SQL and
                all other available APIs.
            </li>
            <li>
                Instantaneous cluster restarts - Ignite becomes fully operational from disk upon a cluster
                startup or restarts without requiring to preload or warm up the memory tier.
            </li>
        </ul>

        <h2>Better High-Availability With Instantaneous Cluster Restarts</h2>

        <p>
            Ignite native persistence takes away the trouble of time-consuming memory warm-ups on cluster restarts.
            When the native persistence is enabled, Ignite stores a superset of data on disk treats it as one of the
            storage layers. Hence, Ignite starts reading data from the persistence layer as soon as the cluster becomes
            active. As you begin to run the queries, the memory tier is warmed up in the background with the data Ignite
            accesses from the disk.
        </p>

        <h2>Avoiding Network Impact on Performance With Co-located Processing</h2>

        <p>
            Disk-centric systems, like RDBMS or NoSQL, generally use the classic client-server approach when
            transferring data from the server to the client-side where it gets processed and then discarded. This
            approach does not scale very well because moving data over the network is the most expensive operation
            in a distributed system.
        </p>
        <p>
            Many distributed databases, including Apache Ignite, support a more scalable approach called co-located
            processing, which eliminates or significantly reduces network traffic by running application logic right
            on the cluster nodes. This approach executes data or compute-intensive queries, including distributed
            SQL with JOINs, exactly where the data resides.
        </p>

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                <div class="title display-6">Learn More</div>
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                            <li><a href="/arch/multi-tier-storage.html">Multi-Tier Storage <i
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                            <li><a href="/arch/persistence.html">Native Persistence <i
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                            <li><a href="/features/collocatedprocessing.html">Co-located Processing <i
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                            <li><a href="/features/sql.html">Distributed SQL <i class="fa fa-angle-double-right"></i></a>
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                            <li><a href="/features/transactions.html">ACID Transactions <i
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                            <li><a href="/features/machinelearning.html">Machine and Deep Learning <i
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                            <li><a href="/use-cases/datagrid.html">Ignite as an In-Memory Data Grid <i
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                            <li><a href="/use-cases/in-memory-cache.html">Ignite as an In-Memory Cache <i
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                            <li><a href="/use-cases/digital-integration-hub.html">Ignite as a Digital Integration Hub <i
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