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<h1 class="title">Introduction</h1>
<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">This extension is not
available on Windows platforms.</span></p></blockquote>
<p class="para">
This module provides an additional session save handler for the
<a href="book.session.html" class="link">session</a>
module using <a href="http://www.postgresql.org/" class="link external">» PostgreSQL</a> as a
storage system. A <em>user-level</em> session storage function may
also be used - <span class="function"><a href="function.session-set-save-handler.html" class="function">session_set_save_handler()</a></span>, but this module is
written in C and therefore could be twice as fast, compared to
a session save handler written in PHP.
</p>
<p class="para">
Session PgSQL is designed to scale any size of web sites and offers some
advanced features:
<ul class="simplelist">
<li class="member">session tables are created automatically</li>
<li class="member">automatic session table vacuum</li>
<li class="member">better garbage collection</li>
<li class="member">multiple PostgreSQL servers support</li>
<li class="member">automatic database server failover (switching)</li>
<li class="member">
automatic database server load balancing if there are multiple
PostgreSQL servers.
</li>
<li class="member">short circuit UPDATE</li>
</ul>
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