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<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">About Transactions and the NoSQL Platform</font></h1>
<p>The JPA transaction API is supported with NoSQL data-sources. Some NoSQL data-sources might not support transactions, so the level of transaction support is dependent on the NoSQL platform. JTA persistence units and transactions are also supported, but unless the NoSQL adapter is integrated with JTA, no XA or transaction support will be available.</p>
<p>If the NoSQL data-source does not support transactions, then any database change such as <code>flush()</code> will be committed directly to the database, and <code>rollback()</code> will not have any affect. A commit operation that fails will not roll back any successful changes written before the error. JPA normally does not write to the database until commit or <code>flush()</code> are called, so there will still be some level of transaction support offered by the persistence context.</p>
<p>JPA operations <code>persist()</code>, <code>merge()</code>, and <code>remove()</code> are supported.</p>
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<p>MongoDB&mdash;Transactions are not supported.</p>
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<p>Oracle NoSQL&mdash;Transactions are not supported.</p>
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