Query is not working properly when statistics are computed (XE 11g Windows 7 32 bits)

Question

Hi,
We have an application with a Oracle XE 11.2 database on a Windows 7 32 bits plateform.
We have a query wich access 4 tables end use a user defined package function.
When the statistics are computed the query is returning no rows, (with the data in the tables it should return 349 rows).
When the statistics are deleted (with ANALYZE TABLE xxx DELETE STATISTICS) the query is working fine.
I tried different statistics calculation methods, and sometimes the query is working, sometimes it is not!
I don't understand how the statistics caluclation method can change the query results.
Has anybody already encountered such an issue?
Regards,
Yves

Answer 1

I understand how the statistics are working.
What i don't undestand is why the number of rows returned is different with or without statistics.
I tried yesterday to had a hint /*+ RULE */ and with the hint, rows are correctly returned!
Here is the query:
SELECT l_activite.copaip, l_activite.nunati, l_activite.numeul, obsoff.dapaul,
                                    obsoff.lai24h / 10 * DECODE (coefat, NULL, 1, 0, 1, coefat / 200) lai24h, obsoff.etfeob, obsoff.tplaco / 10 tplaco,
                                    obsoff.tblaco / 10 tblaco, l_lactoff.nulact, obsoff.dapaul - l_lactoff.dadela + 1 dulact, l_lactoff.dadela,
                                    l_activite.dcenul,
                                    (  obsoff.tblaco
                                     / 10
                                     * (DECODE (obsoff.tblaco, 0, 0, NULL, 0, obsoff.lai24h * DECODE (coefat, NULL, 1, 0, 1, coefat / 200) / 10))
                                    ) mg,
                                    (  obsoff.tplaco
                                     / 10
                                     * (DECODE (obsoff.tplaco, 0, 0, NULL, 0, obsoff.lai24h * DECODE (coefat, NULL, 1, 0, 1, coefat / 200) / 10))
                                    ) mp,
                                    DECODE (obsoff.tblaco, 0, 0, NULL, 0, obsoff.lai24h * DECODE (coefat, NULL, 1, 0, 1, coefat / 200) / 10) lait_mg,
                                    DECODE (obsoff.tplaco, 0, 0, NULL, 0, obsoff.lai24h * DECODE (coefat, NULL, 1, 0, 1, coefat / 200) / 10) lait_mp,
                                    pck_f_valorises.f_present_mul (obsoff.etfeob,
                                                                   obsoff.nulact,
                                                                   (SELECT MAX (l_obsoff.dapaul)
                                                                      FROM l_obsoff
                                                                     WHERE TRIM (l_obsoff.copaip) = TRIM (l_activite.copaip)
                                                                       AND TRIM (l_obsoff.nunati) = TRIM (l_activite.nunati)
                                                                       AND l_obsoff.dapaul < obsoff.dapaul
                                                                       AND l_obsoff.etfeob <> 'T'),
                                                                   obsoff.dapaul,
                                                                   l_lactoff.dadela
                                                                  ) as OK
                               FROM l_activite, l_obsoff obsoff, l_lactoff, l_passage
                              WHERE TRIM (l_activite.copaul) = TRIM ('FR')
                                AND TRIM (l_activite.numeul) = TRIM ('61323017') || '    0'
                                AND TRIM (l_activite.copaip) = TRIM (obsoff.copaip)
                                AND TRIM (l_activite.nunati) = TRIM (obsoff.nunati)
                                AND TRIM (l_activite.copaip) = TRIM (l_lactoff.copaip)
                                AND TRIM (l_activite.nunati) = TRIM (l_lactoff.nunati)
                                AND TRIM (l_passage.copaul) = TRIM (l_activite.copaul)
                                AND TRIM (l_passage.numeul) = TRIM (l_activite.numeul)
                                AND (   (DECODE (l_activite.dacosu, TO_DATE ('01/01/0001', 'dd/MM/YY'), 'VIDE', NULL, 'VIDE', l_activite.dacosu) = 'VIDE')
                                     OR (l_activite.dacosu >= l_passage.dapaul)
                                AND l_passage.dapaul = obsoff.dapaul
                                AND obsoff.nulact = l_lactoff.nulact
                                AND obsoff.dapaul >= l_activite.dcenul
                                AND l_passage.dapaul <= to_date('24/04/2013')
                                AND l_passage.dapaul >= to_date('24/04/2012') - 50
                                AND pck_f_valorises.f_present_mul (obsoff.etfeob,
                                                                   obsoff.nulact,
                                                                   (SELECT MAX (l_obsoff.dapaul)
                                                                      FROM l_obsoff
                                                                     WHERE TRIM (l_obsoff.copaip) = TRIM (l_activite.copaip)
                                                                       AND TRIM (l_obsoff.nunati) = TRIM (l_activite.nunati)
                                                                       AND l_obsoff.dapaul < obsoff.dapaul
                                                                       AND l_obsoff.etfeob <> 'T'),
                                                                   obsoff.dapaul,
                                                                   l_lactoff.dadela
                                                                  ) = 1
and the function :
FUNCTION F_PRESENT_MUL(p_etat IN CHAR,p_nulact IN NUMBER,
p_derniere_obs_lait IN DATE, p_date_passage IN DATE,p_dadela IN DATE)
RETURN NUMBER IS
   NAME:       F_PRESENT_MUL
   PURPOSE:    Retourne 1 si présent MUL 0 sinon
   REVISIONS:
   Ver        Date        Author           Description
   1.0        01/12/2006  Mathieu GUIDEL        1. Created this function.
   NOTES:
BEGIN
   IF p_derniere_obs_lait IS NULL THEN /* vache présente MUL */
    RETURN 1;
   END IF;
   IF p_etat='P' THEN /* vache présente MUL */
   RETURN 1;
   ELSE
    IF p_etat = 'N' THEN /* NC ou FV */
     IF (p_date_passage - p_dadela + 1) <= 7 THEN /* FV */
      IF p_nulact=1 THEN
      RETURN 0;
      ELSE /* considérée comme tarie */
       IF (p_date_passage - p_derniere_obs_lait) < 100 THEN /* derniere obs lait inférieur à 100 jour, présente MUL */
       RETURN 1;
       ELSE /* FV tarie depuis trop longtemps : non présente MUL */
       RETURN 0;
       END IF;
      END IF;
     ELSE /* NC */
     RETURN 1;
     END IF;
    ELSE
     IF p_etat = 'T' THEN /* Tarie */
      IF (p_date_passage - p_derniere_obs_lait) < 100 THEN /* derniere obs lait inférieur à 100 jour, présente MUL */
      RETURN 1;
      ELSE /* tarie depuis trop longtemps : non présente MUL */
      RETURN 0;
      END IF;
      ELSE /* etat différent de P, N, T donc etat = S */
      /*vérification du contrôle précédent non FV*/
      IF (p_derniere_obs_lait - p_dadela + 1) <= 7 THEN /* FV au contrôle précédent*/
      RETURN 0;
      ELSE
        IF (p_date_passage - p_derniere_obs_lait) < 30 THEN /* derniere obs lait ou NC inférieur à 30 jour, présente MUL */
        RETURN 1;
        ELSE /* sortie sans lait depuis trop longtemps : non présente MUL */
        RETURN 0;
        END IF;
      END IF;
     END IF;
    END IF;
   END IF;
END F_PRESENT_MUL;
Regards