Oracle查看表空间使用情况

-- 查看当前表空间使用情况:
SELECT
  SUBSTR(a.TABLESPACE_NAME, 1, 30) TablespaceName,
  round(SUM(a.bytes / 1024 / 1024 / 1024), 2) AS "Totle_size(G)",
  round(SUM(NVL(b.free_space1 / 1024 / 1024 / 1024, 0)), 2) AS "Free_space(G)",
  round(SUM(a.bytes / 1024 / 1024 / 1024), 2) - round(SUM(NVL(b.free_space1 / 1024 / 1024 / 1024, 0)), 2) AS "Used_space(G)",
  ROUND(
    (
    SUM(a.bytes / 1024 / 1024 / 1024) - SUM(NVL(b.free_space1 / 1024 / 1024 / 1024, 0))) * 100 / SUM(a.bytes / 1024 / 1024 / 1024),
  2) AS "Used_percent%",
  round(
  SUM((CASE WHEN a.MAXBYTES = 0 THEN a.bytes ELSE a.MAXBYTES END) / 1024 / 1024 / 1024),
  2) AS "Max_size(G)",
  ROUND(
    (
    SUM(a.bytes / 1024 / 1024 / 1024) - SUM(NVL(b.free_space1 / 1024 / 1024 / 1024, 0))) * 100 / SUM((CASE WHEN a.MAXBYTES = 0 THEN a.bytes ELSE a.MAXBYTES END) / 1024 / 1024 / 1024),
  2) AS "Max_percent%" 
FROM
  dba_data_files a,
  (SELECT SUM(NVL(bytes, 0)) free_space1, file_id FROM dba_free_space GROUP BY file_id) b 
WHERE
  a.file_id = b.file_id (+) 
GROUP BY
  a.TABLESPACE_NAME 
ORDER BY
  "Used_percent%" DESC;