查看oracle数据库真实大小

通过查看监控orabbix，看到一个sql语句，可以查看oracle数据库真实大小。

SELECT        to_char(                sum(                        NVL( a.bytes / 1024 / 1024 / 10 - NVL( f.bytes / 1024 / 1024 / 10, 0 ), 0 )                 ),                'FM99999999999999990'         ) retvalue FROM        sys.dba_tablespaces d,        ( SELECT tablespace_name, sum( bytes ) bytes FROM dba_data_files GROUP BY tablespace_name ) a,        ( SELECT tablespace_name, sum( bytes ) bytes FROM dba_free_space GROUP BY tablespace_name ) f WHERE        d.tablespace_name = a.tablespace_name ( + )         AND d.tablespace_name = f.tablespace_name ( + )         AND NOT ( d.extent_management LIKE 'LOCAL' AND d.contents LIKE 'TEMPORARY' )