Oracle查看数据占用的空间和数据文件实际空间的信息

可以使用如下sql：

select 'bgdrac' database,t11.username,t11.default_tablespace tablespace_name,segment_size_in_GB,datafile_size_in_gb,tablespace_free_size_in_gb from (select username,default_tablespace from dba_users) t11
left join
(
select nvl(t1.tablespace_name,t2.tablespace_name) tablespace_name,t1.size_in_GB datafile_size_in_GB,t2.size_in_GB segment_size_in_GB,t1.size_in_GB-t2.size_in_GB tablespace_free_size_in_GB from
(select tablespace_name,sum(bytes)/1024/1024/1024 size_in_GB from dba_data_files group by tablespace_name) t1
full join
(select tablespace_name,sum(bytes)/1024/1024/1024 size_in_GB from dba_segments group by tablespace_name) t2 on t2.tablespace_name=t1.tablespace_name) t22 on t22.tablespace_name=t11.default_tablespace
where t11.default_tablespace<>'USERS'

以上。