Nls_session_parameter

I wrote a PL/SQL code for showing all NLS parameters executed throught Oracle iAS. The value of some parameters in NLS_SESSION_PARAMETER are different from using SQL query data by SQL*Plus (from client that not set any NLS parameters on) such as NLS_DATE_FORMAT = 'DD MON RRRR' from the PL/SQL code, NLS_DATE_FORMATE = 'DD-MON-RR' from SQL*Plus.

I would like to know where the value of each parameter in NLS_SESSION_PARAMETER table come from is and how I can force it to my format (from the server, not in the code -- DBMS.SET_NLS)?

Thanks

Code:

---

SQL> select * from nls_session_parameters where parameter = 'NLS_DATE_FORMAT';

PARAMETER                      VALUE
------------------------------ ------------------------------
NLS_DATE_FORMAT                DD-MON-RR

SQL> alter session set nls_date_format = 'DD-MON-YYYY';

Session altered.

SQL> select * from nls_session_parameters where parameter = 'NLS_DATE_FORMAT';

PARAMETER                      VALUE
------------------------------ ------------------------------
NLS_DATE_FORMAT                DD-MON-YYYY

---

The values shown in NLS_SESSION_PARAMETERS are session specific. If you want to change at SYSTEM level either you can modify in init.ora or you can user 'ALTER SYSTEM SET NLS_...'

Thank you for your reply.

I know where I can set NLS parameter at SESSION and SYSTEM level but I'm confused why NLS_DATE_FORMAT='DD MON RRRR' was returned by Oracle iAS that I never set the specific NLS paramter on the server. --by default NLS_DATE_FORMAT is 'DD-MON-RR' right?

How can I set the specific NLS parameter on Oracle iAS? :D

Rgds,


PS. Sorry to make you mistake.

1. Query by logging in directly to the host:
SQL> select * from nls_session_parameters where parameter = 'NLS_DATE_FORMAT';

PARAMETER VALUE
------------------------------ ----------------------------------------
NLS_DATE_FORMAT DD-MON-RR

************************************************


2. Set the NLS_DATE_FORMAT in init.ora:
NLS_DATE_FORMAT=DD/MM/YY

************************************************


3. Shutdown and Startup DB (Oracle 8.1.7).


4. Query by logging in directly to the host (again):
SQL> select * from nls_session_parameters where parameter = 'NLS_DATE_FORMAT';

PARAMETER VALUE
------------------------------ ----------------------------------------
NLS_DATE_FORMAT DD/MM/YY

************************************************


5. Run PL/SQL code that containing the SQL statement as the 1st and 4th via a web browser (served by Oracle iAS):

-----------------
NLS Session is
-----------------
Parameters Values
------------------------ ------------------
NLS_DATE_FORMAT DD MON RRRR

************************************************


# Why is NLS_DATE_FORMAT = 'DD MON RRRR'?
It should be NLS_DATE_FORMAT = 'DD/MM/YY' or not?

# If Oracle iAS can specify the NLS parameter, how can I do?
(I would not like to specify its from my code as using DBMS_SESSION.SET_NLS or other)

Regards