NLS parameters in a connection pool environment

I have limited experience of localization/globalization and I am building an application, using Oracle APEX 4.2/Oracle 11 g db, which takes care of several users of different nationalities.  I have a specific question, but first... can anyone recommend good books, blogs and websites to learn more about best practices for the many things you need to think in this area?

Second, my precise question is... Since my application will use a connection pool, how it works as far as setting the NLS parameters for a given client session?  In the typical client/server architecture that I know that you would simply change the NLS parameter when the user connects, and this change would govern just the session of this user database.  It's a different approach when we are in an environment of connection pool?  If this is not the case, how Oracle now manages the parameters of the client session this session of customer may engage in more than one session of db in its lifetime?

You can set the runtime: http://docs.oracle.com/cd/E16655_01/appdev.121/e17961/global_primary_lang.htm#HTMDB14002

Thank you

Sergiusz

Tags: Database

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PARAMETER                      VALUE
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NLS_LANGUAGE                   AMERICAN
NLS_NCHAR_CHARACTERSET         AL16UTF16
NLS_TERRITORY                  AMERICA
NLS_CURRENCY                   $
NLS_ISO_CURRENCY               AMERICA
NLS_NUMERIC_CHARACTERS         .,
NLS_CHARACTERSET               AL32UTF8
NLS_CALENDAR                   GREGORIAN
NLS_DATE_FORMAT                DD-MON-RR
NLS_DATE_LANGUAGE              AMERICAN
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NLS_TIMESTAMP_FORMAT           DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT             HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT        DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY              $
NLS_COMP                       BINARY
NLS_LENGTH_SEMANTICS           BYTE
NLS_NCHAR_CONV_EXCP            FALSE
NLS_RDBMS_VERSION              10.2.0.4.0

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    Parameters at client's environment variable(Its Application sever on Windows):
Oracle Client 10.2.0.4
nls_sort = BINARY_CI
nls_comp = LINGUISTIC
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    Sort of, I did a little test in production to confirm this, as shown below:
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-------------------------------------------------- ------------------------------------------------------------
NLS_LANGUAGE                                       AMERICAN
NLS_TERRITORY                                      AMERICA
NLS_CURRENCY                                       $
NLS_ISO_CURRENCY                                   AMERICA
NLS_NUMERIC_CHARACTERS                             .,
NLS_CALENDAR                                       GREGORIAN
NLS_DATE_FORMAT                                    DD-MON-RR
NLS_DATE_LANGUAGE                                  AMERICAN
NLS_SORT                                           BINARY
NLS_TIME_FORMAT                                    HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT                               DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT                                 HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT                            DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY                                  $
NLS_COMP                                           BINARY
NLS_LENGTH_SEMANTICS                               CHAR
NLS_NCHAR_CONV_EXCP                                FALSE

17 rows selected.

SQL> set autotrace traceonly exp
SQL> select id,is_active from ons where domicile = 'US' and id = 440 and name = 'AMERICAN COMPANY';

Execution Plan
----------------------------------------------------------
Plan hash value: 1171456783

---------------------------------------------------------------------------------------------------------------------
| Id  | Operation                          | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
---------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                   |                |     1 |    49 |     4   (0)| 00:00:01 |       |       |
|   1 |  PARTITION RANGE ALL               |                |     1 |    49 |     4   (0)| 00:00:01 |     1 |     3 |
|*  2 |   TABLE ACCESS BY LOCAL INDEX ROWID| ONS            |     1 |    49 |     4   (0)| 00:00:01 |     1 |     3 |
|*  3 |    INDEX RANGE SCAN                | IDX_COD        |     1 |       |     4   (0)| 00:00:01 |     1 |     3 |
---------------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

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Session altered.

SQL> alter session set nls_comp=LINGUISTIC;

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SQL> select * from nls_session_parameters;

PARAMETER                                          VALUE
-------------------------------------------------- ------------------------------------------------------------
NLS_LANGUAGE                                       AMERICAN
NLS_TERRITORY                                      AMERICA
NLS_CURRENCY                                       $
NLS_ISO_CURRENCY                                   AMERICA
NLS_NUMERIC_CHARACTERS                             .,
NLS_CALENDAR                                       GREGORIAN
NLS_DATE_FORMAT                                    DD-MON-RR
NLS_DATE_LANGUAGE                                  AMERICAN
NLS_SORT                                           BINARY_CI
NLS_TIME_FORMAT                                    HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT                               DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT                                 HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT                            DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY                                  $
NLS_COMP                                           LINGUISTIC
NLS_LENGTH_SEMANTICS                               CHAR
NLS_NCHAR_CONV_EXCP                                FALSE

17 rows selected.


SQL> select id,is_active from ons where domicile = 'US' and id = 440 and name = 'AMERICAN COMPANY';

Execution Plan
----------------------------------------------------------
Plan hash value: 270874147

------------------------------------------------------------------------------------------------------------------------------
| Id  | Operation                          | Name                    | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
------------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                   |                         |     1 |    49 |     2   (0)| 00:00:01 |       |       |
|   1 |  TABLE ACCESS BY GLOBAL INDEX ROWID| ONS                     |     1 |    49 |     2   (0)| 00:00:01 | ROWID | ROWID |
|*  2 |   INDEX RANGE SCAN                 | UX_NAME_BR              |     1 |       |     2   (0)| 00:00:01 |       |       |
------------------------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access(NLSSORT("NAME",'nls_sort=''BINARY_CI''')=HEXTORAW('669696E6720636F6D70
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    Best regards

    Boyan

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