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| <li><a href="/docs/2.9.0//machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li> |
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| <a href="/docs/2.9.0/SQL/ODBC/specification" |
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| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/SQL/schemas.adoc" target="_blank">Edit</a> |
| |
| <h1>Understanding Schemas</h1> |
| |
| <div class="sect1"> |
| <h2 id="overview">Overview</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite has a number of default schemas and supports creating custom schemas.</p> |
| </div> |
| <div class="paragraph"> |
| <p>There are two schemas that are available by default:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The SYS schema, which contains a number of system views with information about cluster nodes. You can’t create tables in this schema. Refer to the <a href="/docs/2.9.0/monitoring-metrics/system-views">System Views</a> page for further information.</p> |
| </li> |
| <li> |
| <p>The <a href="#public-schema">PUBLIC schema</a>, which is used by default whenever a schema is not specified.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Custom schemas are created in the following cases:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>You can specify custom schemas in the cluster configuration. See <a href="#custom-schemas">Custom Schemas</a>.</p> |
| </li> |
| <li> |
| <p>Ignite creates a schema for each cache created via one of the programming interfaces or XML configuration. See <a href="#cache-and-schema-names">Cache and Schema Names</a>.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="public-schema">PUBLIC Schema</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The PUBLIC schema is used by default whenever a schema is required and is not specified. For example, when you connect to the cluster via JDBC without setting the schema explicitly, you will connect to the PUBLIC schema.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="custom-schemas">Custom Schemas</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Custom schemas can be set via the <code>sqlSchemas</code> property of <code>IgniteConfiguration</code>. You can specify a list of schemas in the configuration before starting your cluster and then create objects in these schemas at runtime.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Below is a configuration example with two custom schemas.</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"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"sqlConfiguration"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.SqlConfiguration"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"sqlSchemas"</span><span class="nt">></span> |
| <span class="nt"><list></span> |
| <span class="nt"><value></span>MY_SCHEMA<span class="nt"></value></span> |
| <span class="nt"><value></span>MY_SECOND_SCHEMA<span class="nt"></value></span> |
| <span class="nt"></list></span> |
| <span class="nt"></property></span> |
| <span class="nt"></bean></span> |
| <span class="nt"></property></span> |
| <span class="nt"></bean></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">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span> |
| |
| <span class="nc">SqlConfiguration</span> <span class="n">sqlCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">SqlConfiguration</span><span class="o">();</span> |
| |
| <span class="n">sqlCfg</span><span class="o">.</span><span class="na">setSqlSchemas</span><span class="o">(</span><span class="s">"MY_SCHEMA"</span><span class="o">,</span> <span class="s">"MY_SECOND_SCHEMA"</span> <span class="o">);</span> |
| |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setSqlConfiguration</span><span class="o">(</span><span class="n">sqlCfg</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="csharp"><span class="kt">var</span> <span class="n">cfg</span> <span class="p">=</span> <span class="k">new</span> <span class="n">IgniteConfiguration</span> |
| <span class="p">{</span> |
| <span class="n">SqlSchemas</span> <span class="p">=</span> <span class="k">new</span><span class="p">[]</span> |
| <span class="p">{</span> |
| <span class="s">"MY_SCHEMA"</span><span class="p">,</span> |
| <span class="s">"MY_SECOND_SCHEMA"</span> |
| <span class="p">}</span> |
| <span class="p">};</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code>This API is not presently available for C++. You can use XML configuration.</code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>To connect to a specific schema via, for example, a JDBC driver, provide the schema name in the connection string:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="text">jdbc:ignite:thin://127.0.0.1/MY_SCHEMA</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="cache-and-schema-names">Cache and Schema Names</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>When you create a cache with <a href="/docs/2.9.0/SQL/sql-api#configuring-queryable-fields">queryable fields</a>, you can manipulate the cached data using the <a href="/docs/2.9.0/SQL/sql-api">SQL API</a>. In SQL terms, each such cache corresponds to a separate schema whose name equals the name of the cache.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Similarly, when you create a table via a DDL statement, you can access it as a key-value cache via Ignite’s supported programming interfaces. The name of the corresponding cache can be specified by providing the <code>CACHE_NAME</code> parameter in the <code>WITH</code> part of the <code>CREATE TABLE</code> statement.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="sql"><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">City</span> <span class="p">(</span> |
| <span class="n">ID</span> <span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">),</span> |
| <span class="n">Name</span> <span class="nb">CHAR</span><span class="p">(</span><span class="mi">35</span><span class="p">),</span> |
| <span class="n">CountryCode</span> <span class="nb">CHAR</span><span class="p">(</span><span class="mi">3</span><span class="p">),</span> |
| <span class="n">District</span> <span class="nb">CHAR</span><span class="p">(</span><span class="mi">20</span><span class="p">),</span> |
| <span class="n">Population</span> <span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">),</span> |
| <span class="k">PRIMARY</span> <span class="k">KEY</span> <span class="p">(</span><span class="n">ID</span><span class="p">,</span> <span class="n">CountryCode</span><span class="p">)</span> |
| <span class="p">)</span> <span class="k">WITH</span> <span class="nv">"backups=1, CACHE_NAME=City"</span><span class="p">;</span></code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>See the <a href="/docs/2.9.0/sql-reference/ddl#create-table">CREATE TABLE</a> page for more details.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you do not use this parameter, the cache name is defined in the following format (in capital letters):</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>SQL_<SCHEMA_NAME>_<TABLE_NAME></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="copyright"> |
| © 2020 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> |
| <nav class="right-nav" data-swiftype-index='false'> |
| <ul class="sectlevel1"> |
| <li><a href="#overview">Overview</a></li> |
| <li><a href="#public-schema">PUBLIC Schema</a></li> |
| <li><a href="#custom-schemas">Custom Schemas</a></li> |
| <li><a href="#cache-and-schema-names">Cache and Schema Names</a></li> |
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