al">CHECK</code>
     constraint which excludes the to-be-attached partition's constraint.  If
     this is not done then the <code class="literal">DEFAULT</code> partition will be
     scanned to verify that it contains no records which should be located in
     the partition being attached.  This operation will be performed whilst
     holding an <code class="literal">ACCESS EXCLUSIVE</code> lock on the <code class="literal">
     DEFAULT</code> partition.  If the <code class="literal">DEFAULT</code> part