productname">PostgreSQL</span>,
   providing that instances are running on the same machine architecture and
   the catalog metadata details match.  Compatibility will only be broken
   between minor versions as a last resort.
  </p><p>
   The parameter symbols used to replace constants in
   representative query texts start from the next number after the
   highest <code class="literal">$</code><em class="replaceable"><code>n</code></em> parameter in the original query
   text, or <code class="literal">$1<