Oracle数据库存储空间使用情况查询

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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='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;