<listitem><para>either PostgreSQL or SQLite</para></listitem>

        <listitem><para>PostgreSQL</para></listitem>

      Hydra stores its results in a database, which can be a
      PostgreSQL or SQLite database.  The latter is easier to setup,
      but the former scales better.

      Hydra stores its results in a PostgreSQL database.

      services.  For a SQLite database, the
      <varname>HYDRA_DBI</varname> should be set to something like
      <literal>dbi:SQLite:/path/to/hydra.sqlite</literal>

      services.