查询表空间使用情况

SELECT D.TABLESPACE_NAME "表空间名字",                                                 
       D.STATUS "状态",                                                                
       (A.BYTES / 1024 / 1024) as "总共多少M",                                         
       ((A.BYTES - DECODE(F.BYTES, NULL, 0, F.BYTES)) / 1024 / 1024) as "已经用了多少M",
       (DECODE(F.BYTES, NULL, 0, F.BYTES) / 1024 / 1024) as "剩余多少M",               
       ((A.BYTES - DECODE(F.BYTES, NULL, 0, F.BYTES)) / 1024 / 1024) /                 
       (A.BYTES / 1024 / 1024) as "利用率",                                            
       DECODE(sign(((A.BYTES - DECODE(F.BYTES, NULL, 0, F.BYTES)) / 1024 / 1024) /     
                   (A.BYTES / 1024 / 1024) - 0.9),                                     
                   1, 
              '剩余不到10%，请考虑扩表空间',                                           
              '正常') as "温馨提示"                                                    
  FROM SYS.DBA_TABLESPACES D, SYS.SM$TS_AVAIL A, SYS.SM$TS_FREE F                      
WHERE D.TABLESPACE_NAME = A.TABLESPACE_NAME                                           
   AND F.TABLESPACE_NAME(+) = D.TABLESPACE_NAME;