ro, wait for write-ready
       and try again.)
      </p><p>
       The application can divide the <code class="command">COPY</code> data stream
       into buffer loads of any convenient size.  Buffer-load boundaries
       have no semantic significance when sending.  The contents of the
       data stream must match the data format expected by the
       <code class="command">COPY</code> command; see <a class="xref" href="sql-copy.html" title="COPY"><span class="refentrytitle">COPY</span></a> for details