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>.NET Thin Client</a>
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<li><a href="/docs/latest/binary-client-protocol/binary-client-protocol" class=''>Binary Client Protocol</a></li>
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<a href="/docs/latest/snapshots/snapshots" class='' >Cluster Snapshots</a>
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<a href="/docs/latest/data-rebalancing" class='' >Data Rebalancing</a>
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<button type='button' class='group-toggle collapsed '>Using Key-Value API<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li><a href="/docs/latest/machine-learning/binary-classification/introduction" class=''>Introduction</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/linear-svm" class=''>Linear SVM (Support Vector Machine)</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/decision-trees" class=''>Decision Trees</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/multilayer-perceptron" class=''>Multilayer Perceptron</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/logistic-regression" class=''>Logistic Regression</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
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<li><a href="/docs/latest/machine-learning/regression/introduction" class=''>Introduction</a></li>
<li><a href="/docs/latest/machine-learning/regression/linear-regression" class=''>Linear Regression</a></li>
<li><a href="/docs/latest/machine-learning/regression/decision-trees-regression" class=''>Decision Trees Regression</a></li>
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<li><a href="/docs/latest/machine-learning/clustering/introduction" class=''>Introduction</a></li>
<li><a href="/docs/latest/machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li>
<li><a href="/docs/latest/machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li>
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<a href="/docs/latest/machine-learning/preprocessing"
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<li><a href="/docs/latest/machine-learning/model-selection/introduction" class=''>Introduction</a></li>
<li><a href="/docs/latest/machine-learning/model-selection/evaluator" class=''>Evaluator</a></li>
<li><a href="/docs/latest/machine-learning/model-selection/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li>
<li><a href="/docs/latest/machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li>
<li><a href="/docs/latest/machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li>
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<a href="/docs/latest/machine-learning/multiclass-classification"
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<li><a href="/docs/latest/machine-learning/ensemble-methods/introduction" class=''></a></li>
<li><a href="/docs/latest/machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li>
<li><a href="/docs/latest/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li>
<li><a href="/docs/latest/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li>
<li><a href="/docs/latest/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li>
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<a href="/docs/latest/machine-learning/recommendation-systems"
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>Recommendation Systems</a>
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<li><a href="/docs/latest/machine-learning/importing-model/introduction" class=''>Introduction</a></li>
<li><a href="/docs/latest/machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li>
<li><a href="/docs/latest/machine-learning/importing-model/model-import-from-apache-spark" class=''>Import Model from Apache Spark</a></li>
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<li>
<a href="/docs/latest/key-value-api/continuous-queries" class='' >Using Continuous Queries</a>
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<li>
<a href="/docs/latest/services/services" class='' >Using Ignite Services</a>
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<li>
<a href="/docs/latest/messaging" class='' >Using Ignite Messaging</a>
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<button type='button' class='group-toggle collapsed '>Distributed Data Structures<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/latest/data-structures/atomic-types"
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<a href="/docs/latest/data-structures/countdownlatch"
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<a href="/docs/latest/data-structures/atomic-sequence"
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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/persistence/external-storage.adoc" target="_blank">Edit</a>
<h1>External Storage</h1>
<div class="sect1">
<h2 id="overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can use Ignite as a caching layer on top of an existing database such as an RDBMS or NoSQL databases, for example, Apache Cassandra or MongoDB.
This use case accelerates the underlying database by employing in-memory processing.</p>
</div>
<div class="paragraph">
<p>Ignite provides an out-of-the-box integration with Apache Cassandra.
For other NoSQL databases for which integration is not available off-the-shelf, you can provide your own <a href="/docs/latest/persistence/custom-cache-store">implementation of the <code>CacheStore</code> interface</a>.</p>
</div>
<div class="paragraph">
<p>The two main use cases where an external storage can be used include:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>A caching layer to an existing database. In this scenario, you can improve the processing speed by loading data into memory. You can also bring SQL support to a database that does not have it (when all data is loaded into memory).</p>
</li>
<li>
<p>You want to persist the data in an external database (instead of using the <a href="/docs/latest/persistence/native-persistence">native persistence</a>).</p>
</li>
</ul>
</div>
<div class="imageblock">
<div class="content">
<img src="/docs/2.11.0/images/external_storage.png" alt="external storage">
</div>
</div>
<div class="paragraph">
<p>The <code>CacheStore</code> interface extends both <code>javax.cache.integration.CacheLoader</code> and <code>javax.cache.integration.CacheWriter</code>, which are used for <em>read-through</em> and <em>write-through</em> features respectively. You can also implement each of the interfaces individually and provide them to the cache configuration separately.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
In addition to key-value operations, Ignite writes through the results of SQL INSERT, UPDATE, and MERGE queries. However, SELECT queries never read through data from the external database.
</td>
</tr>
</table>
</div>
<div class="sect2">
<h3 id="read-through-and-write-through">Read-Through and Write-Through</h3>
<div class="paragraph">
<p>Read-through means that the data is read from the underlying persistent store if it is not available in the cache.
Note that this is true only for get operations made through the key-value API; SELECT queries never read through data from the external database.
To execute select queries, the data must be pre-loaded from the database into the cache by calling the <code>loadCache()</code> method.</p>
</div>
<div class="paragraph">
<p>Write-through means that the data is automatically persisted when it is updated in the cache.
All read-through and write-through operations participate in cache transactions and are committed or rolled back as a whole.</p>
</div>
</div>
<div class="sect2">
<h3 id="write-behind-caching">Write-Behind Caching</h3>
<div class="paragraph">
<p>In a simple write-through mode, each put and remove operation involves a corresponding request to the persistent store; therefore, the overall duration of the update operation might be relatively long. Additionally, an intensive cache update rate can cause an extremely high storage load.</p>
</div>
<div class="paragraph">
<p>For such cases, you can enable the <em>write-behind</em> mode, in which update operations are performed asynchronously. The key concept of this approach is to accumulate updates and asynchronously flush them to the underlying database as a bulk operation.
You can trigger flushing of data based on time-based events (the maximum time that data entry can reside in the queue is limited), queue-size events (the queue is flushed when its size reaches some particular point), or both of them (whichever occurs first).</p>
</div>
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<div class="title">Warning</div>
</td>
<td class="content">
<h3 id="performance-vs-consistency" class="discrete">Performance vs. Consistency</h3>
<div class="paragraph">
<p>Enabling write-behind caching increases performance by performing asynchronous updates, but this can lead to a potential drop in consistency as some updates could be lost due to node failures or crashes.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>With the write-behind approach, only the last update to an entry is written to the underlying storage.
If a cache entry with a key named <code>key1</code> is sequentially updated with values <code>value1</code>, <code>value2</code>, and <code>value3</code> respectively, then only a single store request for the <code>(key1, value3)</code> pair is propagated to the persistent store.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<h3 id="update-performance" class="discrete">Update Performance</h3>
<div class="paragraph">
<p>Batch operations are usually more efficient than a sequence of individual operations.
You can exploit this feature by enabling batch operations in the write-behind mode.
Update sequences of similar types (put or remove) can be grouped to a single batch.
For example, if you put the pairs <code>(key1, value1)</code>, <code>(key2, value2)</code>, <code>(key3, value3)</code> into the cache sequentially, the three operations are batched into a single <code>CacheStore.putAll(&#8230;&#8203;)</code> operation.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="rdbms-integration">RDBMS Integration</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To use an RDBMS as an underlying storage, you can use one of the following implementations of <code>CacheStore</code>.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>CacheJdbcPojoStore</code>&#8201;&#8212;&#8201;stores objects as a set of fields using reflection. Use this implementation if you are adding Ignite on top of an existing database and want to use specific fields (or all of them) from the underlying table.</p>
</li>
<li>
<p><code>CacheJdbcBlobStore</code>&#8201;&#8212;&#8201;stores objects in the underlying database in the Blob format. This option is useful in scenarios when you use an external database as a persistent storage and want to store your data in a simple format.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Below are configuration examples for both implementations of <code>CacheStore</code>.</p>
</div>
<div class="sect2">
<h3 id="cachejdbcpojostore">CacheJdbcPojoStore</h3>
<div class="paragraph">
<p>With <code>CacheJdbcPojoStore</code>, you can store objects as a set of fields and can configure the mapping between table columns and objects fields via the configuration.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Set the <code>CacheConfiguration.cacheStoreFactory</code> property to <code>org.apache.ignite.cache.store.jdbc.CacheJdbcPojoStoreFactory</code> and provide the following properties:</p>
<div class="openblock">
<div class="content">
<div class="ulist">
<ul>
<li>
<p><code>dataSourceBean</code>&#8201;&#8212;&#8201;database connection credentials: URL, user, password.</p>
</li>
<li>
<p><code>dialect</code>&#8201;&#8212;&#8201;the class that implements the SQL dialect compatible with your database.
Ignite provides out-of-the-box implementations for MySQL, Oracle, H2, SQLServer, and DB2 databases.
These dialects can be found in the <code>org.apache.ignite.cache.store.jdbc.dialect</code> package of the Ignite distribution.</p>
</li>
<li>
<p><code>types</code>&#8201;&#8212;&#8201;this property is required to define mappings between the database table and the corresponding POJO (see POJO configuration example below).</p>
</li>
</ul>
</div>
</div>
</div>
</li>
<li>
<p>Optionally, configure <a href="/docs/latest/SQL/sql-api#query-entities">query entities</a> if you want to execute SQL queries on the cache.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>The following example demonstrates how to configure an Ignite cache on top of a MySQL table.
The table has 2 columns: <code>id</code> (INTEGER) and <code>name</code> (VARCHAR), which are mapped to objects of the <code>Person</code> class.</p>
</div>
<div class="paragraph">
<p>You can configure <code>CacheJdbcPojoStore</code> via both the XML configuration and Java code.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="cp">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
<span class="c">&lt;!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
--&gt;</span>
<span class="nt">&lt;beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span> <span class="na">xmlns:util=</span><span class="s">"http://www.springframework.org/schema/util"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="na">xsi:schemaLocation=</span><span class="s">" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Data source bean --&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"com.mysql.cj.jdbc.MysqlDataSource"</span> <span class="na">id=</span><span class="s">"mysqlDataSource"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"URL"</span> <span class="na">value=</span><span class="s">"jdbc:mysql://[host]:[port]/[database]"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"user"</span> <span class="na">value=</span><span class="s">"YOUR_USER_NAME"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"password"</span> <span class="na">value=</span><span class="s">"YOUR_PASSWORD"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="c">&lt;!-- Ignite Configuration --&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="c">&lt;!-- Configuration for PersonCache --&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"PersonCache"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheMode"</span> <span class="na">value=</span><span class="s">"PARTITIONED"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"atomicityMode"</span> <span class="na">value=</span><span class="s">"ATOMIC"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.jdbc.CacheJdbcPojoStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataSourceBean"</span> <span class="na">value=</span><span class="s">"mysqlDataSource"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dialect"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.jdbc.dialect.MySQLDialect"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"types"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.jdbc.JdbcType"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheName"</span> <span class="na">value=</span><span class="s">"PersonCache"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"keyType"</span> <span class="na">value=</span><span class="s">"java.lang.Integer"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"valueType"</span> <span class="na">value=</span><span class="s">"org.apache.ignite.snippets.Person"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!--Specify the schema if applicable --&gt;</span>
<span class="c">&lt;!--property name="databaseSchema" value="MY_DB_SCHEMA"/--&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"databaseTable"</span> <span class="na">value=</span><span class="s">"PERSON"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"keyFields"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.jdbc.JdbcTypeField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;constructor-arg&gt;</span>
<span class="nt">&lt;util:constant</span> <span class="na">static-field=</span><span class="s">"java.sql.Types.INTEGER"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/constructor-arg&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">value=</span><span class="s">"id"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">value=</span><span class="s">"int"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">value=</span><span class="s">"id"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"valueFields"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.jdbc.JdbcTypeField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;constructor-arg&gt;</span>
<span class="nt">&lt;util:constant</span> <span class="na">static-field=</span><span class="s">"java.sql.Types.INTEGER"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/constructor-arg&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">value=</span><span class="s">"id"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">value=</span><span class="s">"int"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">value=</span><span class="s">"id"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.jdbc.JdbcTypeField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;constructor-arg&gt;</span>
<span class="nt">&lt;util:constant</span> <span class="na">static-field=</span><span class="s">"java.sql.Types.VARCHAR"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/constructor-arg&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">value=</span><span class="s">"name"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">value=</span><span class="s">"java.lang.String"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">value=</span><span class="s">"name"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"readThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"writeThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- Configure query entities if you want to use SQL queries --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"queryEntities"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.QueryEntity"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"keyType"</span> <span class="na">value=</span><span class="s">"java.lang.Integer"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"valueType"</span> <span class="na">value=</span><span class="s">"org.apache.ignite.snippets.Person"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"keyFieldName"</span> <span class="na">value=</span><span class="s">"id"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"keyFields"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="nt">&lt;value&gt;</span>id<span class="nt">&lt;/value&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"fields"</span><span class="nt">&gt;</span>
<span class="nt">&lt;map&gt;</span>
<span class="nt">&lt;entry</span> <span class="na">key=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"java.lang.String"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;entry</span> <span class="na">key=</span><span class="s">"id"</span> <span class="na">value=</span><span class="s">"java.lang.Integer"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/map&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="c">&lt;!-- Provide similar configurations for other caches/tables --&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/beans&gt;</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">IgniteConfiguration</span> <span class="n">igniteCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span>
<span class="nc">CacheConfiguration</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Person</span><span class="o">&gt;</span> <span class="n">personCacheCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">&lt;&gt;();</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"PersonCache"</span><span class="o">);</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setCacheMode</span><span class="o">(</span><span class="nc">CacheMode</span><span class="o">.</span><span class="na">PARTITIONED</span><span class="o">);</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setAtomicityMode</span><span class="o">(</span><span class="nc">CacheAtomicityMode</span><span class="o">.</span><span class="na">ATOMIC</span><span class="o">);</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setReadThrough</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setWriteThrough</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
<span class="nc">CacheJdbcPojoStoreFactory</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Person</span><span class="o">&gt;</span> <span class="n">factory</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheJdbcPojoStoreFactory</span><span class="o">&lt;&gt;();</span>
<span class="n">factory</span><span class="o">.</span><span class="na">setDialect</span><span class="o">(</span><span class="k">new</span> <span class="nc">MySQLDialect</span><span class="o">());</span>
<span class="n">factory</span><span class="o">.</span><span class="na">setDataSourceFactory</span><span class="o">((</span><span class="nc">Factory</span><span class="o">&lt;</span><span class="nc">DataSource</span><span class="o">&gt;)()</span> <span class="o">-&gt;</span> <span class="o">{</span>
<span class="nc">MysqlDataSource</span> <span class="n">mysqlDataSrc</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">MysqlDataSource</span><span class="o">();</span>
<span class="n">mysqlDataSrc</span><span class="o">.</span><span class="na">setURL</span><span class="o">(</span><span class="s">"jdbc:mysql://[host]:[port]/[database]"</span><span class="o">);</span>
<span class="n">mysqlDataSrc</span><span class="o">.</span><span class="na">setUser</span><span class="o">(</span><span class="s">"YOUR_USER_NAME"</span><span class="o">);</span>
<span class="n">mysqlDataSrc</span><span class="o">.</span><span class="na">setPassword</span><span class="o">(</span><span class="s">"YOUR_PASSWORD"</span><span class="o">);</span>
<span class="k">return</span> <span class="n">mysqlDataSrc</span><span class="o">;</span>
<span class="o">});</span>
<span class="nc">JdbcType</span> <span class="n">personType</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">JdbcType</span><span class="o">();</span>
<span class="n">personType</span><span class="o">.</span><span class="na">setCacheName</span><span class="o">(</span><span class="s">"PersonCache"</span><span class="o">);</span>
<span class="n">personType</span><span class="o">.</span><span class="na">setKeyType</span><span class="o">(</span><span class="nc">Integer</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
<span class="n">personType</span><span class="o">.</span><span class="na">setValueType</span><span class="o">(</span><span class="nc">Person</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
<span class="c1">// Specify the schema if applicable</span>
<span class="c1">// personType.setDatabaseSchema("MY_DB_SCHEMA");</span>
<span class="n">personType</span><span class="o">.</span><span class="na">setDatabaseTable</span><span class="o">(</span><span class="s">"PERSON"</span><span class="o">);</span>
<span class="n">personType</span><span class="o">.</span><span class="na">setKeyFields</span><span class="o">(</span><span class="k">new</span> <span class="nc">JdbcTypeField</span><span class="o">(</span><span class="n">java</span><span class="o">.</span><span class="na">sql</span><span class="o">.</span><span class="na">Types</span><span class="o">.</span><span class="na">INTEGER</span><span class="o">,</span> <span class="s">"id"</span><span class="o">,</span> <span class="nc">Integer</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="s">"id"</span><span class="o">));</span>
<span class="n">personType</span><span class="o">.</span><span class="na">setValueFields</span><span class="o">(</span><span class="k">new</span> <span class="nc">JdbcTypeField</span><span class="o">(</span><span class="n">java</span><span class="o">.</span><span class="na">sql</span><span class="o">.</span><span class="na">Types</span><span class="o">.</span><span class="na">INTEGER</span><span class="o">,</span> <span class="s">"id"</span><span class="o">,</span> <span class="nc">Integer</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="s">"id"</span><span class="o">));</span>
<span class="n">personType</span><span class="o">.</span><span class="na">setValueFields</span><span class="o">(</span><span class="k">new</span> <span class="nc">JdbcTypeField</span><span class="o">(</span><span class="n">java</span><span class="o">.</span><span class="na">sql</span><span class="o">.</span><span class="na">Types</span><span class="o">.</span><span class="na">VARCHAR</span><span class="o">,</span> <span class="s">"name"</span><span class="o">,</span> <span class="nc">String</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="s">"name"</span><span class="o">));</span>
<span class="n">factory</span><span class="o">.</span><span class="na">setTypes</span><span class="o">(</span><span class="n">personType</span><span class="o">);</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setCacheStoreFactory</span><span class="o">(</span><span class="n">factory</span><span class="o">);</span>
<span class="nc">QueryEntity</span> <span class="n">qryEntity</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">QueryEntity</span><span class="o">();</span>
<span class="n">qryEntity</span><span class="o">.</span><span class="na">setKeyType</span><span class="o">(</span><span class="nc">Integer</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">());</span>
<span class="n">qryEntity</span><span class="o">.</span><span class="na">setValueType</span><span class="o">(</span><span class="nc">Person</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">());</span>
<span class="n">qryEntity</span><span class="o">.</span><span class="na">setKeyFieldName</span><span class="o">(</span><span class="s">"id"</span><span class="o">);</span>
<span class="nc">Set</span><span class="o">&lt;</span><span class="nc">String</span><span class="o">&gt;</span> <span class="n">keyFields</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">HashSet</span><span class="o">&lt;&gt;();</span>
<span class="n">keyFields</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="s">"id"</span><span class="o">);</span>
<span class="n">qryEntity</span><span class="o">.</span><span class="na">setKeyFields</span><span class="o">(</span><span class="n">keyFields</span><span class="o">);</span>
<span class="nc">LinkedHashMap</span><span class="o">&lt;</span><span class="nc">String</span><span class="o">,</span> <span class="nc">String</span><span class="o">&gt;</span> <span class="n">fields</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">LinkedHashMap</span><span class="o">&lt;&gt;();</span>
<span class="n">fields</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="s">"id"</span><span class="o">,</span> <span class="s">"java.lang.Integer"</span><span class="o">);</span>
<span class="n">fields</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="s">"name"</span><span class="o">,</span> <span class="s">"java.lang.String"</span><span class="o">);</span>
<span class="n">qryEntity</span><span class="o">.</span><span class="na">setFields</span><span class="o">(</span><span class="n">fields</span><span class="o">);</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setQueryEntities</span><span class="o">(</span><span class="nc">Collections</span><span class="o">.</span><span class="na">singletonList</span><span class="o">(</span><span class="n">qryEntity</span><span class="o">));</span>
<span class="n">igniteCfg</span><span class="o">.</span><span class="na">setCacheConfiguration</span><span class="o">(</span><span class="n">personCacheCfg</span><span class="o">);</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="listingblock">
<div class="title">Person Class</div>
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="kd">class</span> <span class="nc">Person</span> <span class="kd">implements</span> <span class="nc">Serializable</span> <span class="o">{</span>
<span class="kd">private</span> <span class="kd">static</span> <span class="kd">final</span> <span class="kt">long</span> <span class="n">serialVersionUID</span> <span class="o">=</span> <span class="mi">0L</span><span class="o">;</span>
<span class="kd">private</span> <span class="kt">int</span> <span class="n">id</span><span class="o">;</span>
<span class="kd">private</span> <span class="nc">String</span> <span class="n">name</span><span class="o">;</span>
<span class="kd">public</span> <span class="nf">Person</span><span class="o">()</span> <span class="o">{</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">getName</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">name</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setName</span><span class="o">(</span><span class="nc">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">name</span> <span class="o">=</span> <span class="n">name</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">int</span> <span class="nf">getId</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">id</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setId</span><span class="o">(</span><span class="kt">int</span> <span class="n">id</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">id</span> <span class="o">=</span> <span class="n">id</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span></code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="cachejdbcblobstore">CacheJdbcBlobStore</h3>
<div class="paragraph">
<p><code>CacheJdbcBlobStore</code> stores objects in the underlying database in the blob format.
It creates a table named 'ENTRIES', with the 'akey' and 'val' columns (both have the <code>binary</code> type).</p>
</div>
<div class="paragraph">
<p>You can change the default table definition by providing a custom create table query and DML queries used to load, delete, and update the data.
Refer to <a href="https://ignite.apache.org/releases/2.11.0/javadoc/org/apache/ignite/cache/store/jdbc/CacheJdbcBlobStore.html" target="_blank" rel="noopener">CacheJdbcBlobStore</a> for details.</p>
</div>
<div class="paragraph">
<p>In the example below, the objects of the Person class are stored as an array of bytes in a single column.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"mysqlDataSource"</span> <span class="na">class=</span><span class="s">"com.mysql.jdbc.jdbc2.optional.MysqlDataSource"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"URL"</span> <span class="na">value=</span><span class="s">"jdbc:mysql://[host]:[port]/[database]"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"user"</span> <span class="na">value=</span><span class="s">"YOUR_USER_NAME"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"password"</span> <span class="na">value=</span><span class="s">"YOUR_PASSWORD"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"ignite.cfg"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"PersonCache"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.jdbc.CacheJdbcBlobStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataSourceBean"</span> <span class="na">value =</span> <span class="s">"mysqlDataSource"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">IgniteConfiguration</span> <span class="n">igniteCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span>
<span class="nc">CacheConfiguration</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Person</span><span class="o">&gt;</span> <span class="n">personCacheCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">&lt;&gt;();</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"PersonCache"</span><span class="o">);</span>
<span class="nc">CacheJdbcBlobStoreFactory</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Person</span><span class="o">&gt;</span> <span class="n">cacheStoreFactory</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheJdbcBlobStoreFactory</span><span class="o">&lt;&gt;();</span>
<span class="n">cacheStoreFactory</span><span class="o">.</span><span class="na">setUser</span><span class="o">(</span><span class="s">"USER_NAME"</span><span class="o">);</span>
<span class="nc">MysqlDataSource</span> <span class="n">mysqlDataSrc</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">MysqlDataSource</span><span class="o">();</span>
<span class="n">mysqlDataSrc</span><span class="o">.</span><span class="na">setURL</span><span class="o">(</span><span class="s">"jdbc:mysql://[host]:[port]/[database]"</span><span class="o">);</span>
<span class="n">mysqlDataSrc</span><span class="o">.</span><span class="na">setUser</span><span class="o">(</span><span class="s">"USER_NAME"</span><span class="o">);</span>
<span class="n">mysqlDataSrc</span><span class="o">.</span><span class="na">setPassword</span><span class="o">(</span><span class="s">"PASSWORD"</span><span class="o">);</span>
<span class="n">cacheStoreFactory</span><span class="o">.</span><span class="na">setDataSource</span><span class="o">(</span><span class="n">mysqlDataSrc</span><span class="o">);</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setCacheStoreFactory</span><span class="o">(</span><span class="n">cacheStoreFactory</span><span class="o">);</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setWriteThrough</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
<span class="n">personCacheCfg</span><span class="o">.</span><span class="na">setReadThrough</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
<span class="n">igniteCfg</span><span class="o">.</span><span class="na">setCacheConfiguration</span><span class="o">(</span><span class="n">personCacheCfg</span><span class="o">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C#/.NET'></code-tab><code-tab data-tab='C++'></code-tab></code-tabs>
</div>
</div>
</div>
<div class="sect1">
<h2 id="loading-data">Loading Data</h2>
<div class="sectionbody">
<div class="paragraph">
<p>After you configure the cache store and start the cluster, load the data from the database into your cluster as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="c1">// Load data from person table into PersonCache.</span>
<span class="nc">IgniteCache</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Person</span><span class="o">&gt;</span> <span class="n">personCache</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">cache</span><span class="o">(</span><span class="s">"PersonCache"</span><span class="o">);</span>
<span class="n">personCache</span><span class="o">.</span><span class="na">loadCache</span><span class="o">(</span><span class="kc">null</span><span class="o">);</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="nosql-database-integration">NoSQL Database Integration</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can integrate Ignite with any NoSQL database by implementing the <code>CacheStore</code> interface.</p>
</div>
<div class="admonitionblock caution">
<table>
<tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">
Even though Ignite supports distributed transactions, it doesn&#8217;t make your NoSQL database transactional, unless the database supports transactions out of the box.
</td>
</tr>
</table>
</div>
<div class="sect2">
<h3 id="cassandra-integration">Cassandra Integration</h3>
<div class="paragraph">
<p>Ignite provides an out-of-the-box implementation of <code>CacheStore</code> that enables you to use Apache Cassandra as a persistent
storage. This implementation utilizes Cassandra&#8217;s <a href="http://www.datastax.com/dev/blog/java-driver-async-queries" target="_blank" rel="noopener">asynchronous queries</a>
to provide high performance batch operations such as <code>loadAll()</code>, <code>writeAll()</code> and <code>deleteAll()</code>, and automatically creates
all necessary tables and namespaces in Cassandra.</p>
</div>
<div class="paragraph">
<p>Refer to <a href="/docs/latest/extensions-and-integrations/cassandra/overview">this documentation section</a> for configuration and usage guidelines.</p>
</div>
</div>
</div>
</div>
<div class="copyright">
© 2021 The Apache Software Foundation.<br/>
Apache, Apache Ignite, the Apache feather and the Apache Ignite logo are either registered trademarks or trademarks of The Apache Software Foundation.
</div>
</article>
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<div class="toc-wrapper">
<ul class="sectlevel1">
<li><a href="#overview">Overview</a>
<ul class="sectlevel2">
<li><a href="#read-through-and-write-through">Read-Through and Write-Through</a></li>
<li><a href="#write-behind-caching">Write-Behind Caching</a></li>
</ul>
</li>
<li><a href="#rdbms-integration">RDBMS Integration</a>
<ul class="sectlevel2">
<li><a href="#cachejdbcpojostore">CacheJdbcPojoStore</a></li>
<li><a href="#cachejdbcblobstore">CacheJdbcBlobStore</a></li>
</ul>
</li>
<li><a href="#loading-data">Loading Data</a></li>
<li><a href="#nosql-database-integration">NoSQL Database Integration</a>
<ul class="sectlevel2">
<li><a href="#cassandra-integration">Cassandra Integration</a></li>
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</ul>
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