A) All database users have access to ALL_* views.
B) Data dictionary view output is subject to read consistency.
C) The defining queries for Oracle supplied dynamic performance views are stored In the data dictionary.
D) All v$ views display output when queries, if the instance is in nomount state
E) All database users have access to all v$ views.
Answer:AB
原文：http://blog.51cto.com/13854012/2150355