ORACLE資料庫儲存空間使用方式查詢

標籤：

使用系統sys或者dba許可權的賬戶建立視圖如下:

1. 主要從資料庫的表dba_data_files,dba_segments兩張表中擷取。
2. 預設資料庫儲存的是byte單位，轉換關係如下:
1024bytes = 1kb
1024KB = 1M
1024M = 1G

CREATE OR REPLACE VIEW V_GET_DISKSPACE AS
SELECT A.TABLESPACE_NAME,
A.USE "USED (MB)",
(B.TOTAL-A.USE) "FREE (MB)",
B.TOTAL "TOTAL (MB)",
round((B.TOTAL-A.USE)/B.TOTAL,5)*100||‘%‘ "PER_FREE"
FROM
(
select TABLESPACE_NAME,sum(bytes)/(1024*1024) as USE from dba_segments
/*where tablespace_name NOT IN (‘USERS‘,‘SYSAUX‘,‘UNDOTBS1‘,‘SYSTEM‘,‘UNDOTBS2‘)*/
GROUP BY TABLESPACE_NAME
) A ,
(
WITH TABLESPACE_TOTAL AS
(
SELECT tablespace_name,sum(MAXBYTES)/(1024*1024) TOTAL FROM DBA_DATA_FILES T
WHERE /*T.TABLESPACE_NAME NOT IN (‘USERS‘,‘SYSAUX‘,‘UNDOTBS1‘,‘SYSTEM‘,‘UNDOTBS2‘)
AND*/ T.AUTOEXTENSIBLE=‘YES‘ group by tablespace_name
UNION ALL
SELECT tablespace_name,sum(bytes) TOTAL FROM DBA_DATA_FILES T
WHERE /*T.TABLESPACE_NAME NOT IN (‘USERS‘,‘SYSAUX‘,‘UNDOTBS1‘,‘SYSTEM‘,‘UNDOTBS2‘)
AND*/ T.AUTOEXTENSIBLE=‘NO‘ group by tablespace_name
)
SELECT TABLESPACE_NAME,SUM(TOTAL) TOTAL FROM TABLESPACE_TOTAL GROUP BY TABLESPACE_NAME
) B
WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME;

ORACLE資料庫儲存空間使用方式查詢