FAST DUAL in Oracle 10g

Question

Can anybody tell me, What is FAST DUAL in Oracle 10g, How it is different from Oracle 9i DUAL ? with as conceptual example.

Answer 1

He-he, see what you mean, never thought of that. Maybe because my current problems are in a different ball park.
Getting slightly off-topic, this is the preferred way of using dual when getting next value from a sequence.
And I kid you not, if not done exactly like that I won't pass a QA review. (This is just an example, a true implementation would include something like 40-50 lines of headers and comments)
WARNING when reading this. DON'T ever do the following
PROCEDURE fetch_next_empno(inout_contentrec IN OUT add_emp_rec_type)
IS
   k_module CONSTANT VARCHAR2(30) := 'FETCH_NEXT_EMPNO'
   CURSOR c_next_empno
   IS
      SELECT empno_seq.NEXTVAL
        FROM dual;
   v_empno emp.empno%type;
BEGIN
   logger.prc_start(k_module);
   OPEN c_next_empno;
   FETCH c_next_empno
   INTO v_empno;
   IF c_next_empno%NOTFOUND
   THEN
      raise_application_error(-20000, 'No entries in Dual table');
   END IF;
   CLOSE c_next_empno;
   inout_contentrec.empno := v_empno;
   logger.prc_end(k_module);
EXCEPTION
  WHEN OTHERS THEN
    IF c_next_empno%ISOPEN
    THEN
       CLOSE c_next_empno
    END IF;
    logger.error(k_module, SQLERRM);
    RAISE;
END;P.S: This application was started in '95 - Version 7 or something, I guess.
An upgrade from 10gR2 to 11g is currently planned. So far no coding style has been changed.
Why not? - Conformity rules!
Regards
Peter
Edited by: Peter on Jan 23, 2011 6:15 AM
P.S