本站中文解释
DB_DOMAIN是一个固定参数，它指定在Oracle数据库中使用的域，即所有实例变量允许存在的域。它是在安装过程中被设定的，它可以有一个或多个名字，分隔符是一个句点（.）。一旦确定，它不能更改，而且不允许更改。
正确设置Oracle参数DB_DOMAIN的方法如下：
1.在安装过程中设置DB_DOMAIN参数。
2.设置DB_DOMAIN参数的格式应该是一串小写字母，比如example.domain.com。
3.设置不应包含任何未授权的特殊字符或空格。
4.只允许每个实例中使用一个DB_DOMAIN参数，可以跨实例使用。提供不同的域名，如果需要使用多个实例，务必要记住另一个实例的DB_DOMAIN参数。
5.DB_DOMAIN参数在每个实例的pfile或spfile中应该保持一致。
官方英文解释
In a distributed database system, DB_DOMAIN specifies the logical location of the database within the network structure.
| Property | Description |
|---|---|
|
Parameter type |
String |
|
Syntax |
|
|
Default value |
There is no default value. |
|
Modifiable |
No |
|
Modifiable in a PDB |
Yes |
|
Range of values |
Any legal string of name components, separated by periods and up to 128 characters long (including the periods). |
|
Basic |
Yes |
|
Oracle RAC |
You must set this parameter for every instance, and multiple instances must have the same value. |
You should set this parameter if this database is or ever will be part of a distributed system. The value consists of the extension components of a global database name, consisting of valid identifiers (any alphanumeric ASCII characters), separated by periods.
Note:
Oracle recommends that you specify DB_DOMAIN as a unique string for all databases in a domain.
This parameter allows one department to create a database without worrying that it might have the same name as a database created by another department. If one sales department’s DB_DOMAIN is JAPAN.EXAMPLE.COM, then their SALES database (SALES.JAPAN.EXAMPLE.COM) is uniquely distinguished from another database with DB_NAME = SALES but with DB_DOMAIN = US.EXAMPLE.COM.
If you omit the domains from the name of a database link, Oracle expands the name by qualifying the database with the domain of your local database as it currently exists in the data dictionary, and then stores the link name in the data dictionary. DB_DOMAIN should start with an alphabetic character and exclude these characters:
"!@%^&*()+=\\|`~[{]};:'\",<>/?"See Also:
-
Oracle Database
Administrator’s Guide for more information on setting this parameter -
The data dictionary view “GLOBAL_NAME”
