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.
Answer: A
答案解析：
参考：http://docs.oracle.com/cd/E11882_01/server.112/e25494/ds_admin.htm#i1007592
A global database name is formed from two components: a database name and a domain.
A global database name is formed from two components: a database name and a domain. The database name and the domain name are determined by the following initialization parameters at database creation:
| Component | Parameter | Requirements | Example |
|---|---|---|---|
| Database name | DB_NAME |
Must be eight characters or less. | sales |
| Domain containing the database | DB_DOMAIN |
Must follow standard Internet conventions. Levels in domain names must be separated by dots and the order of domain names is from leaf to root, left to right. | us.example.com |
These are examples of valid global database names:
| DB_NAME | DB_DOMAIN | Global Database Name |
|---|---|---|
sales |
example.com |
sales.example.com |
sales |
us.example.com |
sales.us.example.com |
mktg |
us.example.com |
mktg.us.example.com |
payroll |
example.org |
payroll.example.org |
The DB_DOMAIN initialization parameter is only important at database creation time when it is used, together with the DB_NAME parameter, to form the database global name. At this point, the database global
name is stored in the data dictionary. You must change the global name using an ALTER DATABASE statement, notby altering the DB_DOMAIN parameter in the initialization parameter file. It is good practice, however, to change the DB_DOMAIN parameter
to reflect the change in the domain name before the next database startup.