ORACLE 变量之 NLS_LANGUAGE

NLS_LANGUAGE

Property	Description
Parameter type	String
Syntax	NLS_LANGUAGE = language
Default value	Operating system-dependent, derived from the NLS_LANG environment variable
Modifiable	ALTER SESSION
Range of values	Any valid language name
Basic	Yes

NLS_LANGUAGE specifies the default language of the database. This language is used for messages, day and month names, symbols for AD, BC, a.m., and p.m., and the default sorting mechanism. This parameter also determines the default values of the parameters NLS_DATE_LANGUAGE and NLS_SORT.

Note:

The value of this initialization parameter NLS_LANGUAGE is used to initialize the session value of this parameter, which is the actual value referenced by the SQL query processing. This initial value is overridden by a client-side value if the client uses the Oracle JDBC driver or if the client is OCI-based and the NLS_LANG client setting (environment variable) is defined. The initialization parameter value is, therefore, usually ignored.

OCP 题库考核内容

Q122. The  NLS_LANGUAGE  parameter specifiesthe default conventions to be used for which of the following globalization elements?

 

A. Languages for server messages

B. Day and month names and abbreviations

C. Symbols to represent a.m., p.m., AD, and BC

D. Affirmative and negative response strings  (YES, NO)

E. None of the above

F. All of the above

 

Answer: F

一下三条语句分别用了查看数据库、实例、和用户会话的当前NLS值；

SELECT * from nls_database_parameters;

NLS_DATABASE_PARAMETERS  lists permanent NLS parameters of the database.

SELECT * from nls_instance_parameters;

NLS_INSTANCE_PARAMETERS  lists NLS parameters of the instance.

SELECT * from nls_session_parameters;

NLS_SESSION_PARAMETERS  lists NLS parameters of the user session.