title: How to run a HSQLDB server in memory-only mode
body: <p>In the documentation of the HSQLDB is a command line statement to start a HSQLDB server (<a href="http://hsqldb.org/doc/guide/ch01.html" rel="noreferrer">HSQLDB Doc</a>). But there is this "file:mydb" property, so I assume its not in memory-only mode.</p>
  
  <p>How do I run a memory-only HSQLDB server?</p>
  
  <p>I ran the following but get no clue.</p>
  
  <pre><code>java -cp ../lib/hsqldb.jar org.hsqldb.Server -?
  </code></pre>