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   <title>5.&nbsp; Empress</title><link rel="stylesheet" href="css/docbook.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.72.0"><link rel="start" href="manual.html" title="Apache OpenJPA User's Guide"><link rel="up" href="supported_databases.html" title="Appendix&nbsp;2.&nbsp; Supported Databases"><link rel="prev" href="dbsupport_db2.html" title="4.&nbsp; IBM DB2"><link rel="next" href="dbsupport_h2.html" title="6.&nbsp; H2 Database Engine"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.&nbsp;
            Empress
        </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="dbsupport_db2.html">Prev</a>&nbsp;</td><th width="60%" align="center">Appendix&nbsp;2.&nbsp;
        Supported Databases
    </th><td width="20%" align="right">&nbsp;<a accesskey="n" href="dbsupport_h2.html">Next</a></td></tr></table><hr></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="dbsupport_empress"></a>5.&nbsp;
            Empress
        </h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="dbsupport_empress.html#dbsupport_empress_issues">5.1. 
                Known issues with Empress
            </a></span></dt></dl></div><div class="example"><a name="example_props_empress"></a><p class="title"><b>Example&nbsp;2.5.&nbsp;
                Example properties for Empress
            </b></p><div class="example-contents"><pre class="programlisting">
openjpa.ConnectionDriverName: empress.jdbc.empressDriver
openjpa.ConnectionURL: jdbc:empress://SERVER=yourserver;PORT=6322;DATABASE=yourdb
</pre></div></div><br class="example-break"><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="dbsupport_empress_issues"></a>5.1.&nbsp;
                Known issues with Empress
            </h3></div></div></div><div class="itemizedlist"><ul type="disc"><li><p>
Empress enforces pessimistic semantics (lock on
read) when not using <code class="literal">AllowConcurrentRead</code> property (which
bypasses row locking) for <code class="classname">EmpressDictionary</code>.
                    </p></li><li><p>
Only the category 2 non-local driver is supported.
                    </p></li></ul></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="dbsupport_db2.html">Prev</a>&nbsp;</td><td width="20%" align="center"><a accesskey="u" href="supported_databases.html">Up</a></td><td width="40%" align="right">&nbsp;<a accesskey="n" href="dbsupport_h2.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">4.&nbsp;
            IBM DB2
        &nbsp;</td><td width="20%" align="center"><a accesskey="h" href="manual.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;6.&nbsp;
            H2 Database Engine
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