exam question

From: <bulbultyagi_at_now-india.net.in>
Date: Wed, 21 May 2003 22:31:40 -0800
Message-ID: <F001.0059F739.20030521223140@fatcity.com>

Hi all
here is a question

Q. You need to determine the amount of space currently used in each tablespace.
You can retrieve this information in a single SQL statment using only one DBA view in the FROM clause providing you use either the _______ or _______ DBA view.

A.DBA_EXTENTS. B.DBA_SEGMENTS. C.DBA_DATA_FILES. D.DBA_TABLESPACES. I was thinking that dba_extents and dba_segments would be the correct answer because i could use :
select tablespace_name, sum(bytes) from dba_extents group by tablespace_name ;

select tablespace_name, sum(bytes) from dba_segments group by tablespace_name;

But The answer given says dba_extents and dba_data_files. Is the given answer wrong or is there some way of finding out from dba_data_files how much space is used up in a tablespace

For that matter what does the question want to know ? does it want to know how much space do the tablespaces have ( that would be the sum of the sizes of the data files ) or how much is ""used up"" ?

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Author: <bulbultyagi_at_now-india.net.in
  INET: bulbultyagi_at_now-india.net.in

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