单项选择题

You are maintaining your database in Oracle10g. You find that the number of languages that should be supported in your database has increased. The character set of your database is UTF8. You decide to migrate your database to the AL16UTF16 national character set.
How will you migrate your database from UTF8 to AL16UTF16？（）

A. by using the RMAN utility
B. by using the export/import utility
C. by using the ALTER DATABASE command
D. by enabling the change tracking feature

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单项选择题

Click the Exhibit（s） button to view the EMPLOYEES table.

The EMPLOYEE table contains thousands of rows. The EMP_CODE column is the primary key column. At the end of every month， you are required to perform search queries based on the BASIC_SAL+COMM column values. Which type of index will you create？（）

A. B-tree Index
B. Bitmap Index
C. Function-based Index
D. Partitioned Index

单项选择题

You issued the following command at the UNIX environment：
% setenv ORA_SDTZ ’OZ_TZ’
What will be the impact of issuing the above command？（）

A. The operating system local time zone will be set for a user session using the operating system environment variable.
B. The database local time zone will be set for a user session using the operating system environment variable.
C. The operating system local time zone will be set for the database using the operating system environment
D. The database local time zone will be set for the database using the operating system environment variable.

单项选择题

You are maintaining your Oracle10g database in the UNIX environment. An application requires one of the user sessions to exist in the operating system local time zone. You decide to set the time zone for a session using the operating system environment variable. Which command will you issue？（）

A. setenv ORA_SDTZ ’DB_TZ’
B. setenv ORA_SDTZ ’+10：00’
C. setenv ORA_SDTZ ’OS-TZ’
D. setenv ORA_SDTZ ’Europe/London’