Size of Oracle Database
I would like to know how to calculate the size of the Database via an SQL query.
I know that I should add the datafiles and the redo logs. I even used the query below, yet it retreived a number different than that found via the EM.. Database Size(GB) under Space Summary
select a.data_size+b.temp_size+c.redo_size "total_size" 
	
from ( select sum(bytes) data_size 
	
        from dba_data_files ) a, 
	
    ( select nvl(sum(bytes),0) temp_size 
	
        from dba_temp_files ) b, 
	
    ( select sum(bytes) redo_size 
	
        from sys.v_$log ) c; 
Thanks in advance
