How the index will be fired...............

Hi All,
I have one problem.........
Like i created an index on two columns as follows......
CREATE INDEX gpm_personprofiledemo_dob2_idx ON gpm_personprofiledemo
(profile_updated_dt, birth_dt)
PCTFREE 10
INITRANS 2
MAXTRANS 255
TABLESPACE gpmix
STORAGE (
INITIAL 104857600
NEXT 52428800
PCTINCREASE 0
MINEXTENTS 2
MAXEXTENTS 5
When I query the table as follows the index is getting fired..
SELECT /*+ INDEX(PPD GPM_PERSONPROFILEDEMO_DOB2_IDX) */
PPD.PANELIST_ID, PPD.FNAME, PPD.LNAME, PPD.GENDER, PPD.BIRTH_DT, ROUND(TRUNC(SYSDATE-PPD.BIRTH_DT)/365) AGE,
PPD.HISPANIC_LANGUAGE, PPD.PROFILE_UPDATED_DT
FROM GPM_PERSONPROFILEDEMO PPD
WHERE PPD.PROFILE_UPDATED_DT = TO_DATE('28-APR-2002', 'DD-MON-YYYY')
AND PPD.BIRTH_DT = TO_DATE('15-OCT-1973', 'DD-MON-YYYY');
Even when I tried with the following query also the index is getting fired.
SELECT /*+ INDEX(PPD GPM_PERSONPROFILEDEMO_DOB2_IDX) */
PPD.PANELIST_ID, PPD.FNAME, PPD.LNAME, PPD.GENDER, PPD.BIRTH_DT, ROUND(TRUNC(SYSDATE-PPD.BIRTH_DT)/365) AGE,
PPD.HISPANIC_LANGUAGE, PPD.PROFILE_UPDATED_DT
FROM GPM_PERSONPROFILEDEMO PPD
WHERE PPD.PROFILE_UPDATED_DT = TO_DATE('28-APR-2002', 'DD-MON-YYYY');
But when I use the following query, its not getting fired. Its taking "INDEX FULL SCAN"
SELECT /*+ INDEX(PPD GPM_PERSONPROFILEDEMO_DOB2_IDX) */
PPD.PANELIST_ID, PPD.FNAME, PPD.LNAME, PPD.GENDER, PPD.BIRTH_DT, ROUND(TRUNC(SYSDATE-PPD.BIRTH_DT)/365) AGE,
PPD.HISPANIC_LANGUAGE, PPD.PROFILE_UPDATED_DT
FROM GPM_PERSONPROFILEDEMO PPD
WHERE PPD.BIRTH_DT = TO_DATE('15-OCT-1973', 'DD-MON-YYYY');
Can you explain me why so?
Like what am thinking is i created the index on "profile_updated_dt, birth_dt" but not on "birth_dt, profile_updated_dt".
Is there any preference for the order of columns during the creation of the INDEX.
Am stuck with this issue. And am unable to solve it. Can any one help me out?
Because its very urgent.
Thanks in advance
Sudarshan

But when I use the following query, its not getting fired. Its taking "INDEX FULL SCAN"I would have thought that the later part of the above statement contradicts with the earlier part of the statement.
its not getting firedcontradicts this statement:
Its taking "INDEX FULL SCAN"Since the birth_dt is not the leading column of your index ...
Is it doing a INDEX FULL SCAN on the GPM_PERSONPROFILEDEMO_DOB2_IDX index?
if you have queries that involve profile_update_dt + birth_dt and some others that involve only birth_dt, then why not have the index in birth_dt + profile_update_dt instead?

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But when I use the following query, its not getting fired. Its taking "INDEX FULL SCAN"I would have thought that the later part of the above statement contradicts with the earlier part of the statement.
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