CAVEATS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">13.6. Caveats <a href="#MVCC-CAVEATS" class="id_link">#</a></h2></div></div></div><p>
    Some DDL commands, currently only <a class="link" href="sql-truncate.html" title="TRUNCATE"><code class="command">TRUNCATE</code></a> and the
    table-rewriting forms of <a class="link" href="sql-altertable.html" title="ALTER TABLE"><code class="command">ALTER TABLE</code></a>, are not
    MVCC-safe.  This means that after the truncation 