语句中的{tablespace_name}根据实际情况修改为表空间名称
select ff.rtime,
ee.name,
ff.tablespace_size *
(select value from v$parameter where name = 'db_block_size') / 1024 / 1024 tablespace_sizemb,
ff.tablespace_usedsize *
(select value from v$parameter where name = 'db_block_size') / 1024 / 1024 tablespace_usedsize_mb,
ff.tablespace_maxsize *
(select value from v$parameter where name = 'db_block_size') / 1024 / 1024 tablespace_maxsize_mb
from dba_hist_tbspc_space_usage ff, v$tablespace ee
where rtime > to_char(sysdate - 90)
and ee.TS# = ff.tablespace_id
and ee.NAME = {tablespace_name}
order by rtime;