Oracle 查询表空间使用情况（经典篇）

--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;

--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,
       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;