–查询表空间使用情况
  SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
  D.TOT_GROOTTE_MB "表空间大小(M)",
  D.TOT_GROOTTE_MB – F.TOTAL_BYTES "已使用空间(M)",
  TO_CHAR(ROUND((D.TOT_GROOTTE_MB – F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,2),'990.99') || '%' "使用比",
  F.TOTAL_BYTES "空闲空间(M)",
  F.MAX_BYTES "最大块(M)"
  FROM (SELECT TABLESPACE_NAME,
  ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
  ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_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
  FROM SYS.DBA_DATA_FILES DD
  GROUP BY DD.TABLESPACE_NAME) D
  WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
  ORDER BY 1
  –查询表空间的free space
  select tablespace_name,
  count(*) as extends,
  round(sum(bytes) / 1024 / 1024, 2) as MB,
  sum(blocks) as blocks
  from dba_free_space
  group by tablespace_name;oracle认证更多详细资料
  –查询表空间的总容量
  select tablespace_name, sum(bytes) / 1024 / 1024 as MB
  from dba_data_files
  group by tablespace_name;
  –查询表空间使用率
  select total.tablespace_name,
  round(total.MB, 2) as Total_MB,考试大论坛
  round(total.MB – free.MB, 2) as Used_MB,
  round((1 – free.MB / total.MB) * 100, 2) || '%' as Used_Pct
  from (select tablespace_name, sum(bytes) / 1024 / 1024 as MB
  from dba_free_space
  group by tablespace_name) free,
  (select tablespace_name, sum(bytes) / 1024 / 1024 as MB
  from dba_data_files
  group by tablespace_name) total
  where free.tablespace_name = total.tablespace_name;




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