查看所有表空间大小、剩余量：

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) AND dbf.tablespace_name='SLAVE_ECMAT';