oracle 查看数据库空间使用情况

1、查看所有表空间大小

select tablespace_name,sum(bytes)/1024/1024 from dba_data_files group by tablespace_name;

2、未使用的表空间大小

select tablespace_name,sum(bytes)/1024/1024 from dba_free_space group by tablespace_name;

3、使用的表空间大小

select df.tablespace_name,SUM(df.bytes)/1024/1024 total,SUM(fs.bytes)/1024/1024 free,SUM(df.bytes-fs.bytes)/1024/1024 used from dba_data_files df,dba_free_space fs
where df.tablespace_name = fs.tablespace_name
group by df.tablespace_name