   <code>data</code> field refers.  Otherwise, the <code>size</code> field
    is set to the length needed for the requested item, and a
    <A HREF="../../../com/sleepycat/db/MemoryException.html" title="class in com.sleepycat.db"><CODE>MemoryException</CODE></A> is thrown.
    <p>
    Applications can determine the length of a record by setting
    <code>length</code> to 0 and calling <A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getSize()"><CODE>DatabaseEntry.getSize</CODE></A>
    on the return 