I want to know the size of of database

hi, iam using HP-UX with oracle10G so that, i want to know the size of of database in my system, for that i can use the follwing queries is this is correct or not?
1. select sum(bytes) as total_size from dba_data_files;
ANS is:
TOTAL_SIZE
29718740992
2.select sum(bytes) as free_size from dba_free_space;
ANS is:
FREE_SIZE
6940393472
3. select sum(bytes) as used_size from dba_segments;
ANS is:
USED_SIZE
25215827968
i GOT like this iam not getting is this TOTAL size is 28 GB?????????????
4.select * from DBA_FREE_SPACE_COALESCED;
ANS for this ????????????????
please help me anyone......

i want to know the size of of database in my systemDefine "size":
- The total size of the dbf files?
- The total data space used?
- The total tablespace size?
For example, this show the size of a single table, in meg:
select
segment_name table_name,
sum(bytes)/(1024*1024) table_size_meg
from
user_extents
where
segment_type='TABLE'
and
segment_name = 'MYTAB' ;
Mike Ault has a script collection that measures all possible ways to measure database size:
http://www.oracle-script.com
Hope this helps. . .
Don Burleson
Oracle Press author
Author of “Oracle Tuning: The Definitive Reference”
http://www.dba-oracle.com/bp/s_oracle_tuning_book.htm

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