Oracle查询表占用空间大小

一、查询本用户的表、视图等

select * from user_tab_comments; 
select * from user_col_comments; 

二、查询所有表空间的大小

select segment_name,sum(bytes)/1024/1024/1024 gb from dba_segments where  owner='用户名' group by segment_name order by GB desc

查询结果如下图：

三、查询某个用户表空间大小

select sum(bytes)/1024/1024/1024 gb from dba_segments where  owner='用户名' and  segment_name='表名'