Oracle 查询表空间使用情况（经典篇）

　　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

　　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;

　　select tablespace_name, sum(bytes) / 1024 / 1024 as MB

　　from dba_data_files

　　group by tablespace_name;

　　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;