is 4GB on
         32-bit systems and 10TB on 64-bit systems.  (All sizes are in
         powers-of-two, that is, 256KB is 2^18 not 256,000.) For information on
         tuning the Berkeley DB cache size, see 
         <a href="../../programmer_reference/general_am_conf.html#am_conf_cachesize" class="olink">Selecting a cache size</a>.
    </p>
      <p>
         It is possible to specify caches to Berkeley DB large enough they
         cannot be allocated contiguously on some architectures.  For example,
  