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<title>START TRANSACTION</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
<a name="sql-start-transaction"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2>Name</h2>
<p>START TRANSACTION — start a transaction block</p>
</div>
<a name="id789493"></a><div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">START TRANSACTION [ <em class="replaceable"><code>transaction_mode</code></em> [, ...] ]
where <em class="replaceable"><code>transaction_mode</code></em> is one of:
ISOLATION LEVEL { SERIALIZABLE | REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED }
READ WRITE | READ ONLY</pre>
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<div class="refsect1" lang="en">
<a name="id789526"></a><h2>Description</h2>
<p> This command begins a new transaction block. If the isolation level or
read/write mode is specified, the new transaction has those
characteristics, as if <a href="sql-set-transaction.html">SET TRANSACTION</a> was executed. This is the same
as the <a href="sql-begin.html">BEGIN</a> command.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id789558"></a><h2>Parameters</h2>
<p> Refer to <a href="sql-set-transaction.html">SET TRANSACTION</a> for information on the meaning
of the parameters to this statement.
</p>
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<div class="refsect1" lang="en">
<a name="id789578"></a><h2>Compatibility</h2>
<p> In the standard, it is not necessary to issue <code class="command">START TRANSACTION</code>
to start a transaction block: any SQL command implicitly begins a block.
<span class="productname">PostgreSQL</span>'s behavior can be seen as implicitly
issuing a <code class="command">COMMIT</code> after each command that does not
follow <code class="command">START TRANSACTION</code> (or <code class="command">BEGIN</code>),
and it is therefore often called “<span class="quote">autocommit</span>”.
Other relational database systems may offer an autocommit feature
as a convenience.
</p>
<p> The SQL standard requires commas between successive <em class="replaceable"><code>transaction_modes</code></em>, but for historical
reasons <span class="productname">PostgreSQL</span> allows the commas to be
omitted.
</p>
<p> See also the compatibility section of <a href="sql-set-transaction.html">SET TRANSACTION</a>.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id789660"></a><h2>See Also</h2>
<span class="simplelist"><a href="sql-begin.html">BEGIN</a>, <a href="sql-commit.html">COMMIT</a>, <a href="sql-rollback.html">ROLLBACK</a>, <a href="sql-savepoint.html">SAVEPOINT</a>, <a href="sql-set-transaction.html">SET TRANSACTION</a></span>
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