单项选择题
A.The user must enable the role explicitly.
B.The user can grant the role to other users.
C.The user cannot use the role until the DBA enables it explicitly.
D.The user can start using the role immediately without any changes
单项选择题 Which statement is true about a whole consistent database backup on a database running in ARCHIVELOGmode（）
单项选择题 View the Exhibit and examine the privileges granted to the MGR_ROLE role. The user SKD has been grantedthe CONNECT and RESOURCE roles only. The database administrator （DBA） grants MGR_ROLE to the userSKD by executing the command： SQL> GRANT MGR_ROLE TO SKD WITH ADMIN OPTION； Which statement is true about the user SKD afterhe/she is granted this role（）
单项选择题 You executed the command to create a password file in the database server： $ orapwd file=orapworcl entries=5ignorecase=N Which statement describes the purpose of the above password file（）