Oracle查询表空间使用情况
可用根据DBA_DATA_FILES 和 DBA_FREE_SPACE两个视图来查询
-
DBA_FREE_SPACE ：字段BYTES，表示该表空间 `已用空间`
-
DBA_DATA_FILES ：字段BYTES， 表示该表空间 `当前可使用的总空间`
-
DBA_DATA_FILES ：字段MAXBYTES， 表示该表空间 `当前可扩展到的最大空间`
```sql
SELECT TOTAL.TABLESPACE_NAME AS 表空间名,
ROUND(TOTAL.MB - FREE.MB, 2) || ' MB' AS 当前已用空间,
ROUND(FREE.MB, 2) || ' MB' AS 当前可用空间,
ROUND(TOTAL.MB, 2) || ' MB' AS 当前可用的总空间,
ROUND((1 - FREE.MB / TOTAL.MB) * 100, 2) || '%' AS 当前使用百分比,
ROUND(TOTAL.MAX_MB, 2) || ' MB' AS 可扩展到的最大空间,
DECODE(TOTAL.MAX_MB, 0, 0, ROUND(TOTAL.MAX_MB - TOTAL.MB, 2)) ||
' MB' AS 剩余可扩展的空间,
DECODE(TOTAL.MAX_MB,
0,
0,
ROUND((1 - TOTAL.MB / TOTAL.MAX_MB) * 100, 2)) || '%' AS 剩余可扩展的百分比,
ROUND(TOTAL.MAX_MB - FREE.MB, 2) || ' MB' AS 剩余可用的最大空间
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,
SUM(MAXBYTES) / 1024 / 1024 AS MAX_MB
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) TOTAL
WHERE FREE.TABLESPACE_NAME = TOTAL.TABLESPACE_NAME
ORDER BY TOTAL.TABLESPACE_NAME
```