使用系统sys或者dba权限的账户创建视图如下:
1. 主要从数据库的表dba_data_files,dba_segments两张表中获取。
2. 默认数据库保存的是byte单位，转换关系如下:
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= 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= 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;
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