操作oracle表空间语句

创建表空间

create tablespace wly2
logging
datafile 'E:\oracle\oradata\orcl9i\wly2.dbf'
size 50m
autoextend on
next 50m maxsize 100m
extent management local;

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.已经使用的表空间大小

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

3.总的表空间大小，已经使用，空闲的大小可以用下面语句得到

select a.tablespace_name,total,free,total-free used from 
( select tablespace_name,sum(bytes)/1024/1024 total from dba_data_files
   group by tablespace_name) a, 
( select tablespace_name,sum(bytes)/1024/1024 free from dba_free_space
   group by tablespace_name) b
where a.tablespace_name=b.tablespace_name;