114.You plan to implement the distributed database system in your company. You invoke Database Confi

114.You plan to implement the distributed database system in your company. You invoke Database
Configuration Assistant (DBCA) to create a database on the server. During the installation, DBCA prompts
you to specify the Global Database Name.
What must this name be made up of?
A.It must be made up of a database name and a domain name.
B.It must be made up of the value in ORACLE_SID and HOSTNAME.
C.It must be made up of the value that you plan to assign for INSTANACE_NAME and HOSTNAME.
D.It must be made up of the value that you plan to assign for ORACLE_SID and SERVICE_NAMES.
答案：A
解析：
1.Global Database Name
The full database name that uniquely distinguishes it from any other database in your network domain.
For example:
sales.us.example.com
where sales is the name you want to call your database and us.example.com is the network domain in which the database is located.
2.GLOBAL_NAMES
GLOBAL_NAMES specifies whether a database link is required to have the same name as the database to which it connects.
它的功能主要是限制dblink的，大概意思就是
如果A通过dblinke连接B，并且A上的global_names参数设置为true的话，那么dblinke的名字必须与B上面的global_name名字相同，
如果想创建多个dblink那么可以在名字后面增加@...,这样就可以创建多个了
SQL> show parameter global_names 
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
global_names                         boolean     FALSE


SQL> select * from global_name;
GLOBAL_NAME
--------------------------------------------------------------------------------
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