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Which two statements are true about the data dictionary?
Correct Answer: B,D
The data dictionary contains metadata (data about data) about the database and its objects. A). False. DBA_ views display metadata for objects accessible to the database administrator, not only for the SYS schema. B). True. ALL_ views display information about all the objects that the current user has access to. This does not necessarily mean the user has privileges on these objects, only that the user can see them. C). False. The data dictionary is not accessible when the database is closed because it requires the database to be open in order to access the system tables. D). True. Not all types of metadata are available in all three prefixes (ALL_, DBA_, USER_). Some specific metadata might only be available in one or two of these view types. E). False. The data dictionary stores metadata in tables. The various views (ALL_, DBA_, USER_, etc.) provide different perspectives on this data. References: * Oracle Documentation on Data Dictionary and Dynamic Performance Views: https://docs.oracle.com/cd/B28359_01/server.111/b28310/datadict.htm