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<div class="left-nav__overlay"></div>
<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/SQL/sql-transactions.adoc" target="_blank">Edit</a>
<h1>SQL Transactions</h1>
<div id="preamble">
<div class="sectionbody">
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<div class="title">Important</div>
</td>
<td class="content">
Support for SQL transactions is currently in the beta stage. For production use, consider key-value transactions.
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>SQL Transactions are supported for caches that use the <code>TRANSACTIONAL_SNAPSHOT</code> atomicity mode. The <code>TRANSACTIONAL_SNAPSHOT</code> mode is the implementation of multiversion concurrency control (MVCC) for Ignite caches. For more information about MVCC and current limitations, visit the <a href="/docs/2.9.0/transactions/mvcc">Multiversion Concurrency Control</a> page.</p>
</div>
<div class="paragraph">
<p>See the <a href="/docs/2.9.0/sql-reference/transactions">Transactions</a> page for the transaction syntax supported by Ignite.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="enabling-mvcc">Enabling MVCC</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To enable MVCC for a cache, use the <code>TRANSACTIONAL_SNAPSHOT</code> atomicity mode in the cache configuration. If you create a table with the <code>CREATE TABLE</code> command, specify the atomicity mode as a parameter in the <code>WITH</code> part of the command:</p>
</div>
<code-tabs><code-tab data-tab='SQL'><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">Person</span> <span class="k">WITH</span> <span class="nv">"ATOMICITY=TRANSACTIONAL_SNAPSHOT"</span></code></pre>
</div>
</div></code-tab><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">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;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">"myCache"</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">"TRANSACTIONAL_SNAPSHOT"</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></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">CacheConfiguration</span> <span class="n">cacheCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">&lt;&gt;();</span>
<span class="n">cacheCfg</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">);</span>
<span class="n">cacheCfg</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">TRANSACTIONAL_SNAPSHOT</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">cacheCfg</span> <span class="p">=</span> <span class="k">new</span> <span class="n">CacheConfiguration</span>
<span class="p">{</span>
<span class="n">Name</span> <span class="p">=</span> <span class="s">"myCache"</span><span class="p">,</span>
<span class="n">AtomicityMode</span> <span class="p">=</span> <span class="n">CacheAtomicityMode</span><span class="p">.</span><span class="n">TransactionalSnapshot</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>
</div>
<div class="sect1">
<h2 id="limitations">Limitations</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="cross-cache-transactions">Cross-Cache Transactions</h3>
<div class="paragraph">
<p>The <code>TRANSACTIONAL_SNAPSHOT</code> mode is enabled per cache and does not permit caches with different atomicity modes within one transaction. Thus, if you want to cover multiple tables in one SQL transaction, all tables must be created with the <code>TRANSACTIONAL_SNAPSHOT</code> mode.</p>
</div>
</div>
<div class="sect2">
<h3 id="nested-transactions">Nested Transactions</h3>
<div class="paragraph">
<p>Ignite supports three modes of handling nested SQL transactions that can be enabled via a JDBC/ODBC connection parameter.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="n">jdbc</span><span class="p">:</span><span class="n">ignite</span><span class="p">:</span><span class="n">thin</span><span class="p">:</span><span class="o">//</span><span class="mi">127</span><span class="p">.</span><span class="mi">0</span><span class="p">.</span><span class="mi">0</span><span class="p">.</span><span class="mi">1</span><span class="o">/?</span><span class="n">nestedTransactionsMode</span><span class="o">=</span><span class="k">COMMIT</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>When a nested transaction occurs within another transaction, the system behavior depends on the <code>nestedTransactionsMode</code> parameter:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>ERROR</code> — When the nested transaction is encountered, an error is thrown and the enclosing transaction is rolled back. This is the default behavior.</p>
</li>
<li>
<p><code>COMMIT</code> — The enclosing transaction is committed; the nested transaction starts and is committed when its COMMIT statement is encountered. The rest of the statements in the enclosing transaction are executed as implicit transactions.</p>
</li>
<li>
<p><code>IGNORE</code> — DO NOT USE THIS MODE. The beginning of the nested transaction is ignored, statements within the nested transaction will be executed as part of the enclosing transaction, and all changes will be committed with the commit of the nested transaction. The subsequent statements of the enclosing transaction will be executed as implicit transactions.</p>
</li>
</ul>
</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.
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<ul class="sectlevel1">
<li><a href="#overview">Overview</a></li>
<li><a href="#enabling-mvcc">Enabling MVCC</a></li>
<li><a href="#limitations">Limitations</a>
<ul class="sectlevel2">
<li><a href="#cross-cache-transactions">Cross-Cache Transactions</a></li>
<li><a href="#nested-transactions">Nested Transactions</a></li>
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