Examine the following commands for redefining a table with Virtual Private Database (VPD) policies:
Which two statements are true about redefining the table?
A. All the triggers for the table are disabled without changing any of the column names or column types in the table.
B. The primary key constraint on the EMPLOYEES table is disabled during redefinition.
C. VPD policies are copied from the original table to the new table during online redefinition.
D. You must copy the VPD policies manually from the original table to the new table during online redefinition.
Answer: A,C
Explanation: The triggers cloned to the interim table are disabled until the redefinition is completed. Once the redefinition is complete, all cloned objects are renamed to the original names used by they objects they were cloned from.
参考Oracle官方文档：
http://docs.oracle.com/database/121/ADMIN/tables.htm#BABHHACA
http://docs.oracle.com/database/121/ADMIN/tables.htm#BABBIGBI
http://docs.oracle.com/database/121/DBSEG/vpd.htm#DBSEG007