SELECT a.tablespace_name 表空间名,
total 表空间大小,
free 表空间剩余大小,
(total – free) 表空间使用大小,
ROUND((total – free) / total, 4) * 100 使用率
FROM (SELECT tablespace_name, ROUND(SUM(bytes) / (1024 * 1024), 4) free
FROM DBA_FREE_SPACE
GROUP BY tablespace_name) a,
(SELECT tablespace_name, ROUND(SUM(bytes) / (1024 * 1024), 4) total
FROM DBA_DATA_FILES
GROUP BY tablespace_name) b
WHERE a.tablespace_name = b.tablespace_name
