檢視oracle資料庫----size

檢視物理size和實際size

select name,sum(dbsz)/1024/1024 "Physical siZe MB" from
(select sum(bytes) dbsz from dba_data_files
union all
select sum(bytes) dbsz from dba_temp_files
union all
select sum(bytes) dbsz from v$log),v$database
group by name

OR

select name,sum(a.dbsz)/1024/1024 "Physical siZe MB",b.actsz/1024/1024 "Actual Size in Mb"
from (select sum(bytes) dbsz from dba_data_files
union all
select sum(bytes) dbsz from dba_temp_files
union all
select sum(bytes) dbsz from v$log) a ,
(select sum(bytes) actsz from dba_extents) b ,v$database
group by name,b.actsz
NAME      Physical siZe MB Actual Size in Mb
--------- ---------------- -----------------
ORA11G          28348.8125         22796.625

 

查詢表空間使用情況
　　SELECT UPPER(F.TABLESPACE_NAME) "表空間名",
　　D.TOT_GROOTTE_MB "表空間大小(M)",
　　D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空間(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 "空閒空間(M)",
　　F.MAX_BYTES "最大塊(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

 

--查詢表空間的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;

--查詢表空間的總容量
　　select tablespace_name, sum(bytes) / 1024 / 1024 as MB
　　from dba_data_files
　　group by tablespace_name;

 

--查詢表空間使用率
　SELECT a.tablespace_name, round(a.bytes / 1024 / 1024) "Sum MB",
       round((a.bytes - b.bytes) / 1024 / 1024) "used MB",
       round(b.bytes / 1024 / 1024) "free MB",
       round(((a.bytes - b.bytes) / a.bytes) * 100, 2) "percent_used"
  FROM (SELECT tablespace_name, SUM(bytes) bytes
           FROM dba_data_files
          GROUP BY tablespace_name) a,
       (SELECT tablespace_name, SUM(bytes) bytes, MAX(bytes) largest
           FROM dba_free_space
          GROUP BY tablespace_name) b
 WHERE a.tablespace_name = b.tablespace_name(+)
 ORDER BY ((a.bytes - b.bytes) / a.bytes) DESC;