##查询语句

select upper(f.tablespace_name) as tablespace_name,d.tot_grootte_mb as "Size(MB)",f.total_bytes as "Free size(MB)",d.tot_grootte_mb - f.total_bytes as "Already in use(MB)",round((d.tot_grootte_mb - f.total_bytes) / d.tot_grootte_mb * 100,2) as "Percent used(%)",round(d.maxbytes / 1024) as "Maximum value(GB)",round((d.tot_grootte_mb - f.total_bytes) / d.maxbytes * 100,2) as "Percent of maximum value%"
  from (select tablespace_name,round(sum(bytes) / (1024 * 1024),2) total_bytes
          from sys.dba_free_space
         group by tablespace_name) f,(select dd.tablespace_name,round(sum(dd.bytes) / (1024 * 1024),2) tot_grootte_mb,round(sum(case
                           when dd.autoextensible = 'YES' then
                            dd.maxbytes
                           else
                            dd.bytes
                         end) / (1024 * 1024),2) maxbytes
          from sys.dba_data_files dd
         group by dd.tablespace_name) d
 where d.tablespace_name = f.tablespace_name
 order by tablespace_name;