DEALLOCATE DESCRIPTOR — deallocate an SQL descriptor area
DEALLOCATE DESCRIPTOR name     DEALLOCATE DESCRIPTOR deallocates a named SQL
     descriptor area.
    
nameThe name of the descriptor which is going to be deallocated. It is case sensitive. This can be an SQL identifier or a host variable.
EXEC SQL DEALLOCATE DESCRIPTOR mydesc;
     DEALLOCATE DESCRIPTOR is specified in the SQL
     standard.