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<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/configuring-caches/atomicity-modes.adoc" target="_blank">Edit</a>
<h1>Atomicity Modes</h1>
<div class="paragraph">
<p>By default, a cache supports only atomic operations, and bulk operations such as <code>putAll()</code> or <code>removeAll()</code> are executed as a sequence of individual puts and removes.
You can enable transactional support and group multiple cache operations, on one or more keys, into a single atomic transaction.
These operations are executed without any other interleaved operations on the specified keys, and either all succeed or all fail.
There is no partial execution of the operations.</p>
</div>
<div class="paragraph">
<p>To enable support for transactions for a cache, set the <code>atomicityMode</code> parameter in the cache configuration to <code>TRANSACTIONAL</code>.</p>
</div>
<div class="admonitionblock caution">
<table>
<tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">
If you configure multiple caches within one <a href="/docs/latest/configuring-caches/cache-groups">cache group</a>, the caches must be either all atomic, or all transactional. You cannot have both TRANSACTIONAL and ATOMIC caches in one cache group.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Ignite supports 3 atomicity modes, which are described in the following table.</p>
</div>
<table class="tableblock frame-all grid-all stripes-even fit-content">
<colgroup>
<col>
<col>
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Atomicity Mode</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">ATOMIC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The default mode.
All operations are performed atomically, one at a time.
Transactions are not supported.
The <code>ATOMIC</code> mode provides better performance by avoiding transactional locks, whilst providing data atomicity and consistency for each single operation.
Bulk writes, such as the <code>putAll(&#8230;&#8203;)</code> and <code>removeAll(&#8230;&#8203;)</code> methods, are not executed in one transaction and can partially fail.
If this happens, a <code>CachePartialUpdateException</code> is thrown and contains a list of keys for which the update failed.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">TRANSACTIONAL</p></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Enables support for ACID-compliant transactions executed via the key-value API.
SQL transactions are not supported.
Transactions in this mode can have different <a href="/docs/latest/key-value-api/transactions#concurrency-modes-and-isolation-levels">concurrency modes and isolation levels</a>.
Enable this mode only if you need support for ACID-compliant operations.
For more information about transactions, see <a href="/docs/latest/key-value-api/transactions">Performing Transactions</a>.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<h3 id="performance-considerations" class="discrete">Performance Considerations</h3>
<div class="paragraph">
<p>The <code>TRANSACTIONAL</code> mode adds a performance cost to cache operations and should be enabled only if you need transactions.</p>
</div>
</td>
</tr>
</table>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">TRANSACTIONAL_SNAPSHOT</p></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>An experimental mode that implements multiversion concurrency control (MVCC) and supports both key-value transactions and SQL transactions. See <a href="/docs/latest/transactions/mvcc">Multiversion Concurrency Control</a> for details about and limitations of this mode.</p>
</div>
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<div class="title">Warning</div>
</td>
<td class="content">
<div class="paragraph">
<p>MVCC implementation is in beta and should not be considered for production.</p>
</div>
</td>
</tr>
</table>
</div></div></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>You can enable transactions for a cache in the cache configuration.</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">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"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="c">&lt;!-- Optional transaction configuration. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"transactionConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.TransactionConfiguration"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Configure TM lookup here. --&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">();</span>
<span class="n">cacheCfg</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"cacheName"</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</span><span class="o">);</span>
<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="n">cfg</span><span class="o">.</span><span class="na">setCacheConfiguration</span><span class="o">(</span><span class="n">cacheCfg</span><span class="o">);</span>
<span class="c1">// Optional transaction configuration. Configure TM lookup here.</span>
<span class="nc">TransactionConfiguration</span> <span class="n">txCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">TransactionConfiguration</span><span class="o">();</span>
<span class="n">cfg</span><span class="o">.</span><span class="na">setTransactionConfiguration</span><span class="o">(</span><span class="n">txCfg</span><span class="o">);</span>
<span class="c1">// Start a node</span>
<span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</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">CacheConfiguration</span> <span class="p">=</span> <span class="k">new</span><span class="p">[]</span>
<span class="p">{</span>
<span class="k">new</span> <span class="nf">CacheConfiguration</span><span class="p">(</span><span class="s">"txCache"</span><span class="p">)</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">Transactional</span>
<span class="p">}</span>
<span class="p">},</span>
<span class="n">TransactionConfiguration</span> <span class="p">=</span> <span class="k">new</span> <span class="n">TransactionConfiguration</span>
<span class="p">{</span>
<span class="n">DefaultTransactionConcurrency</span> <span class="p">=</span> <span class="n">TransactionConcurrency</span><span class="p">.</span><span class="n">Optimistic</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>
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