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                                                                WHERE country.code IN ('USA','BRA','ESP','JPN')
                                                                GROUP BY country.name, city.name
                                                                ORDER BY max_pop DESC LIMIT 3;
                                                            </code>
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                                                                &lt;bean class="org.apache.ignite.configuration.IgniteConfiguration"&gt;
                                                                    &lt;property name="dataStorageConfiguration"&gt;
                                                                        &lt;bean class="org.apache.ignite.configuration.DataStorageConfiguration"&gt;
                                                                            &lt;property name="defaultDataRegionConfiguration"&gt;
                                                                                &lt;bean class="org.apache.ignite.configuration.DataRegionConfiguration"&gt;
                                                                                    &lt;property name="persistenceEnabled" value="true"/&gt;
                                                                                &lt;/bean&gt;
                                                                            &lt;/property&gt;
                                                                        &lt;/bean&gt;
                                                                    &lt;/property&gt;
                                                                &lt;/bean&gt;
                                                            </code>
                                                        </pre>
                                                </div>
                                                <div class="tab-pane " id="storage-java">
                                                        <pre class="language-java">
                                                            <code>
                                                            IgniteConfiguration cfg = new IgniteConfiguration();

                                                            DataStorageConfiguration storageCfg = new DataStorageConfiguration();

                                                            // Enable Ignite Persistence
                                                            storageCfg.getDefaultDataRegionConfiguration().setPersistenceEnabled(true);
                                                            </code>
                                                        </pre>
                                                </div>
                                                <div class="tab-pane " id="storage-csharp">
                                                        <pre class="language-csharp">
                                                            <code>
                                                            var cfg = new IgniteConfiguration
                                                            {
                                                                DataStorageConfiguration = new DataStorageConfiguration
                                                                {
                                                                    DefaultDataRegionConfiguration = new DataRegionConfiguration
                                                                    {
                                                                        Name = "Default_Region",
                                                                        PersistenceEnabled = true
                                                                    }
                                                                }
                                                            };
                                                            </code>
                                                        </pre>
                                                </div>
                                            </div>
                                        </div>

                                        <a href="/docs/latest/memory-architecture"
                                           onclick="gtag('event',  'homepage_click', {'event_category':'apache_ignite_features', 'event_label': 'multi_tier_storage'});"
                                           title="Apache Ignite Multi-Tier Storage"
                                           aria-label="Apache Ignite Multi-Tier Storage"
                                           class="btn btn-secondary">Learn More About Storage Engine</a>
                                    </div>
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                                            onclick="gtag('event',  'homepage_click', {'event_category':'features_section_tabs', 'event_label': 'colocated_compute'});"
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                                        <svg>
                                            <use xlink:href="#index-icons--Compute"></use>
                                        </svg>
                                        <span class="d-block d-md-none">Co-located Compute</span>
                                        <span class="d-none d-md-block">Co-located Compute in Java, Scala, Kotlin, C#, C++</span>
                                    </a></h3>
                                </div>

                                <div id="feat-vtab-cb-colocated" class="collapse" data-parent="#v-pills-tabContent"
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                                        <p>
                                            With traditional databases, for in-place calculations, you use stored procedures
                                            that are written in a language such as PL/SQL. With Ignite, you use modern
                                            JVM languages, C# or C++ to develop and execute custom tasks across your
                                            distributed database:
                                        </p>

                                        <div class="code-tabs">
                                            <ul class="nav nav-tabs">
                                                <li class="nav-item">
                                                    <a class="nav-link active" data-toggle="tab" href="#compute-java">Java</a>
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                                                <div class="tab-pane active" id="compute-java">
                                                        <pre class="language-java">
                                                            <code>
                                                            // Broadcast the task to server nodes only.
                                                            IgniteCompute compute = ignite.compute(ignite.cluster().forServers());

                                                            // Each remote server node will execute the logic of the task/lambda below.
                                                            compute.broadcast(() -> System.out.println(
                                                                "Hello Node: " + ignite.cluster().localNode().id()));
                                                            </code>
                                                        </pre>
                                                </div>
                                                <div class="tab-pane" id="compute-csharp">
                                                        <pre class="language-csharp">
                                                            <code>
                                                            // Broadcast the task to server nodes only.
                                                            var compute = ignite.GetCluster().ForServers().GetCompute();

                                                            // Each remote server node will execute the custom PrintNodeIdAction task.
                                                            compute.Broadcast(new PrintNodeIdAction());
                                                            </code>
                                                        </pre>
                                                </div>

                                            </div>
                                        </div>

                                        <a href="/docs/latest/distributed-computing/distributed-computing"
                                           onclick="gtag('event',  'homepage_click', {'event_category':'apache_ignite_features', 'event_label': 'co_located_processsing'});"
                                           title="Apache Ignite Co-located Processing"
                                           aria-label="Apache Ignite Co-located Processing"
                                           class="btn btn-secondary">Start Using Compute APIs</a>
                                    </div>
                                </div>
                            </div>

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                                 aria-labelledby="feat-vtab-acid">
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                                        <svg>
                                            <use xlink:href="#index-icons--ACID"></use>
                                        </svg>
                                        <span class="d-block">ACID Transactions</span>
                                    </a></h3>
                                </div>

                                <div id="feat-vtab-cb-acid" class="collapse" data-parent="#v-pills-tabContent"
                                     role="tabpanel" aria-labelledby="feat-vtab-ch-acid">
                                    <div class="card-body">
                                        <p>
                                            Ignite can operate in a strongly consistent mode that provides full support
                                            for distributed ACID transactions. Transact across multiple cluster nodes,
                                            caches, tables, and partitions:
                                        </p>

                                        <div class="code-tabs">
                                            <ul class="nav nav-tabs">
                                                <li class="nav-item">
                                                    <a class="nav-link active" data-toggle="tab"
                                                       href="#transactions-java">Java</a>
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                                                       href="#transactions-csharp">C#/.NET</a>
                                                </li>
                                            </ul>

                                            <!-- Tab panes -->
                                            <div class="tab-content">
                                                <div class="tab-pane active" id="transactions-java">
                                                        <pre class="language-java">
                                                            <code>
                                                                IgniteTransactions transactions = ignite.transactions();

                                                                try (Transaction tx = transactions.txStart()) {
                                                                    Integer hello = cache.get("Hello");

                                                                    if (hello == 1)
                                                                        cache.put("Hello", 11);

                                                                    cache.put("World", 22);

                                                                    tx.commit();
                                                                }
                                                            </code>
                                                        </pre>
                                                </div>
                                                <div class="tab-pane" id="transactions-csharp">
                                                        <pre class="language-csharp">
                                                            <code>
                                                                var transactions = ignite.GetTransactions();

                                                                using (var tx = transactions.TxStart()) {
                                                                    int hello = cache.Get("Hello");

                                                                    if (hello == 1) {
                                                                        cache.Put("Hello", 11);
                                                                    }

                                                                    cache.Put("World", 22);

                                                                    tx.Commit();
                                                                }
                                                            </code>
                                                        </pre>
                                                </div>

                                            </div>
                                        </div>

                                        <a href="/features/acid-transactions.html"
                                           onclick="gtag('event',  'homepage_click', {'event_category':'apache_ignite_features', 'event_label': 'transactions'});"
                                           title="Apache Ignite ACID Transactions"
                                           aria-label="Apache Ignite ACID Transactions"
                                           class="btn btn-secondary">Learn More About Transactions</a>
                                    </div>
                                </div>
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                                        <svg>
                                            <use xlink:href="#index-icons--Machine-Learning"></use>
                                        </svg>
                                        <span class="d-block d-md-none">Machine Learning</span>
                                        <span class="d-none d-md-block">Built-In Machine Learning</span>
                                    </a></h3>
                                </div>
                                <div id="feat-vtab-cb-ml" class="collapse" data-parent="#v-pills-tabContent"
                                     role="tabpanel" aria-labelledby="feat-vtab-ch-ml">
                                    <div class="card-body">

                                        <p>
                                            Ignite machine learning uses built-in algorithms and tools, as well as
                                            TensorFlow integration, to enable the building of scalable machine learning
                                            models and avoid costly data transfers. Train, deploy, evaluate, and update
                                            your ML and DL models continuously and at scale:
                                        </p>

                                        <div class="code-tabs">
                                            <ul class="nav nav-tabs">
                                                <li class="nav-item">
                                                    <a class="nav-link active" data-toggle="tab"
                                                       href="#ml-java">Java</a>
                                                </li>
                                            </ul>

                                            <!-- Tab panes -->
                                            <div class="tab-content">
                                                <div class="tab-pane active" id="ml-java">
                                                        <pre class="language-java">
                                                            <code>
                                                            // Create the trainer
                                                            KNNClassificationTrainer trainer = new KNNClassificationTrainer()
                                                            .withK(3).withIdxType(SpatialIndexType.BALL_TREE)
                                                            .withDistanceMeasure(new EuclideanDistance())
                                                            .withWeighted(true);

                                                            // Train the model
                                                            KNNClassificationModel knnMdl = trainer.fit(ignite, dataCache, vectorizer);

                                                            // Make a prediction
                                                            double prediction = knnMdl.predict(observation);
                                                            </code>
                                                        </pre>
                                                </div>
                                            </div>
                                        </div>

                                        <a href="/docs/latest/machine-learning/machine-learning"
                                           onclick="gtag('event',  'homepage_click', {'event_category':'apache_ignite_features',
                                            'event_label': 'machine_learning'});"
                                           title="Apache Ignite Machine Learning"
                                           aria-label="Apache Ignite Machine Learning"
                                           class="btn btn-secondary">Start Using Ignite Machine Learning</a>
                                    </div>
                                </div>
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                                            onclick="gtag('event',  'homepage_click', {'event_category':'features_section_tabs', 'event_label': 'continuous_queries'});"
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                                        <svg style="padding: 6px;">
                                            <use xlink:href="#index-icons--continous-q"></use>
                                        </svg>
                                        <span class="d-block">Continuous Queries</span>
                                    </a></h3>
                                </div>
                                <div id="feat-vtab-cb-conquery" class="collapse" data-parent="#v-pills-tabContent"
                                     role="tabpanel" aria-labelledby="feat-vtab-ch-conquery">
                                    <div class="card-body">
                                        <p>
                                            With relational databases, you use triggers to react to certain events.
                                            With Ignite, you deploy continuous queries that are written in a modern
                                            programming language such as Java or C# and process streams of changes on
                                            the database and application side:
                                        </p>

                                        <div class="code-tabs">
                                            <ul class="nav nav-tabs">
                                                <li class="nav-item">
                                                    <a class="nav-link active" data-toggle="tab" href="#conquery-java">Java</a>
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                                                </li>
                                            </ul>

                                            <!-- Tab panes -->
                                            <div class="tab-content">
                                                <div class="tab-pane active" id="conquery-java">
                                                        <pre class="language-java">
                                                            <code>
                                                            ContinuousQuery<Integer, String> qry = new ContinuousQuery<>();

                                                            // The callback that will be triggered on the application side.
                                                            qry.setLocalListener(new MyLocalListener());

                                                            // The callback that will be executed on the server side.
                                                            qry.setRemoteFilterFactory(new MyRemoteFilterFactory());

                                                            // Deploy the query in the cluster.
                                                            cache.query(query);
                                                            </code>
                                                        </pre>
                                                </div>
                                                <div class="tab-pane" id="conquery-csharp">
                                                        <pre class="language-csharp">
                                                            <code>
                                                            var cache = ignite.GetOrCreateCache<int, string>("myCache");

                                                            var query = new ContinuousQuery<int, string>(
                                                                new MyLocalListener(), // Will be triggered on the application side.
                                                                new MyRemoteFilter()); // Will be executed on the server side.

                                                            // Deploy the query in the cluster.
                                                            var handle = cache.QueryContinuous(query);
                                                            </code>
                                                        </pre>
                                                </div>
                                            </div>
                                        </div>

                                        <a href="/docs/latest/key-value-api/continuous-queries"
                                           onclick="gtag('event',  'homepage_click', {'event_category':'apache_ignite_features',
                                            'event_label': 'continuous_queries'});"
                                           title="Apache Ignite Continuous Queries"
                                           aria-label="Apache Ignite Continuous Queries"
                                           class="btn btn-secondary">Start Using Continuous Queries</a>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>


            </div>

        </div>
    </section>

    <section id="home-use-cases" class="section-block">


        <div class="container">
            <h2>How to <strong>Use</strong></h2>

            <div class="row">
                <div class="txt-wrapper">
                    <h3>Applications Acceleration &amp; Data Caching</h3>
                    <p>
                        Accelerate your existing applications by 100x using Ignite as an in-memory cache or in-memory
                        data grid that is deployed over one or more external databases. Think of a cache that you can
                        query with SQL, transact, and compute on.
                    </p>

                    <a href="/use-cases/in-memory-data-grid.html"  role="button" class="btn btn-primary" title="In-Memory Data Grid"
                       onclick="gtag('event',  'homepage_click', {'event_category':'apache_ignite_use_cases', 'event_label': 'data_grid'});">
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                    <p>
                        Build modern applications that support transactional and analytical workloads by using Ignite as
                        a database that scales beyond the available memory capacity. Ignite allocates memory for your hot
                        data and goes to disk whenever applications query cold records.
                    </p>

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                         alt="Distributed Database Diagram"/>
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                <div class="txt-wrapper">
                    <h3>High-Performance Computing</h3>
                    <p>
                        Execute kilobyte-size custom code over petabytes of data. Turn your Ignite database into a
                        distributed supercomputer for low-latency calculations, complex analytics, and machine learning.
                    </p>

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                    <img class="lazyload"
                        width="546" height="388"
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