oracle查询某个用户下的全部数据表的表名和大小
select a.segment_name,a.segment_type,a.bytes,a.bytes / 1024 / 1024 byte_m,b.created
from dba_segments a
inner join all_objects b on b.object_type = \'TABLE\' and a.owner = b.owner and a.segment_name = b.object_name
where a.owner = \'USER\' and a.segment_type = \'TABLE\' /* and a.bytes>50000000*/
order by a.bytes desc;
a.owner后面跟想查询的用户名，查询没数据，可以试下a.owner = upper(\'USER\')