查看Oracle数据库表空间信息

1 查看表空间已经使用的百分比

select a.tablespace_name,

a.bytes / 1024 / 1024 "Sum MB",

(a.bytes - b.bytes) / 1024 / 1024 "used MB",

b.bytes / 1024 / 1024 "free MB",

round(((a.bytes - b.bytes) / a.bytes) * 100, 2) "percent_used"

from (select tablespace_name, sum(bytes) bytes

from dba_data_files

group by tablespace_name) a,

(select tablespace_name, sum(bytes) bytes, max(bytes) largest

from dba_free_space

group by tablespace_name) b

where a.tablespace_name = b.tablespace_name

order by ((a.bytes - b.bytes) / a.bytes) desc;

2 查看每个数据文件是否自动扩展，可以自动扩展的最大值。

select file_id, file_name, tablespace_name, autoextensible, maxbytes/1024/1024

from dba_data_files

order by file_id desc;

3 获取创建表空间的语句

select dbms_metadata.get_ddl('TABLESPACE', 'TEST') from dual;

4增加与删除表空间的数据文件

alter tablespace TEST add datafile '/oradata/test/test02.dbf' size 10m;

alter tablespace TEST drop datafile '/oradata/test/test02.dbf';