使用系統sys或者dba許可權的賬戶建立檢視如下:

1. 主要從資料庫的表dba_data_files,dba_segments兩張表中獲取。
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;

LINUX伺服器查詢

1. du -sch * 使用該命令查詢當前目錄下資料夾佔用的空間的情況

2. df -hl 查詢磁碟剩餘空間