You want to access employee details contained in flat files as part of the EMPLOYEE table. You planto add a new column to the EMPLOYEE table to achieve this. 
Which data type would you use for the new column（）

单项选择题You created a profile APP_USER and assigned it to the users. After a month， you decide to drop theprofile.Some user sessions are currently connected to the database instance and are using the APP_USERprofile. This command is used to drop the profile： SQL> DROP PROFILE app_user；  Which statement describes the result（）

A.The command produces an error.
B.The profile is dropped and current user sessions use the DEFAULT profile immediately.
C.The profile is dropped and only the subsequent user sessions use the DEFAULT profile.
D.The profile is dropped， the sessions are terminated， and the subsequent user sessions use theDEFAULT profile.

单项选择题In your database instance， the user sessions are connected to the database server from the remotemachines. You want to achieve the following for these users：  1：The user account must be locked after four unsuccessful login attempts.PASSWORD_LOCK_TIME  2：The user must be prompted to change the password at regular intervals.PASSWORD_LIFE_TIME  3：The user may not have more than three simultaneous sessions.SESSIONS_PER_USER  4：The user session must automatically be logged off if more than 10 minutes elapsed time used.CONNECT_TIME  How would you accomplish the above（）

A.by assigning profiles for the users
B.by implementing Fine-Grained Auditing （FGA）
C.by granting a secure application role to the users
D.by implementing the Database Resource Manager plan