如何查看oracle所有的表空间

方法一 SQL语句：

select dbf.tablespace_name,
	dbf.totalspace "总量(M)",
	dbf.totalblocks as 总块数,
	dfs.freespace "剩余总量(M)",
	dfs.freeblocks "剩余块数",
	(dfs.freespace / dbf.totalspace) * 100 "空闲比例" 
	from (select t.tablespace_name,
	sum(t.bytes) / 1024 / 1024 totalspace,
	sum(t.blocks) totalblocks
	from dba_data_files t
	group by t.tablespace_name) dbf,
	(select tt.tablespace_name,
	sum(tt.bytes) / 1024 / 1024 freespace,
	sum(tt.blocks) freeblocks
	from dba_free_space tt
	group by tt.tablespace_name) dfs
	where trim(dbf.tablespace_name) = trim(dfs.tablespace_name)

方法二 SQL语句：

SELECT Total.name "Tablespace Name",
	Free_space, (total_space-Free_space) Used_space, total_space
	FROM
	(select tablespace_name, sum(bytes/1024/1024) Free_Space
	from sys.dba_free_space
	group by tablespace_name
	) Free,
	(select b.name, sum(bytes/1024/1024) TOTAL_SPACE
	from sys.v_$datafile a, sys.v_$tablespace B
	where a.ts# = b.ts#
	group by b.name
	) Total
	WHERE Free.Tablespace_name = Total.name