Oracle查看修改表空间

一、查看表空间

--1、查看表空间的名称及大小

SELECT t.tablespace_name,round(SUM(bytes / (1024 * 1024)),0) ts_size

FROM dba_tablespaces t,dba_data_files d

WHERE t.tablespace_name = d.tablespace_name

GROUP BY t.tablespace_name;

--2、查看表空间物理文件的名称及大小

SELECT tablespace_name,

file_id,

file_name,

round(bytes / (1024 * 1024),0) total_space

FROM dba_data_files

ORDER BY tablespace_name;

--3、查看回滚段名称及大小

SELECT segment_name,

tablespace_name,

r.status,

(initial_extent / 1024) initialextent,

(next_extent / 1024) nextextent,

max_extents,

v.curext curextent

FROM dba_rollback_segs r,v$rollstat v

WHERE r.segment_id = v.usn(+)

ORDER BY segment_name;

--4、查看控制文件

SELECT NAME FROM v$controlfile;

--5、查看日志文件

SELECT MEMBER FROM v$logfile;

--6、查看表空间的使用情况

SELECT SUM(bytes) / (1024 * 1024) AS free_space,tablespace_name

FROM dba_free_space

GROUP BY tablespace_name;

SELECT a.tablespace_name,

a.bytes/(1024*1024) total,

b.bytes/(1024*1024) used,

c.bytes/(1024*1024) free,

(b.bytes * 100) / a.bytes "USERATE",

(c.bytes * 100) / a.bytes "FREERATE"

FROM sys.sm$ts_avail a,sys.sm$ts_used b,sys.sm$ts_free c

WHERE a.tablespace_name = b.tablespace_name

AND a.tablespace_name = c.tablespace_name

order by USERATE desc;

--7、查看数据库库对象

SELECT owner,object_type,status,COUNT(*) count#

FROM all_objects

GROUP BY owner,status;

--8、查看数据库的版本　

SELECT version

FROM product_component_version

WHERE substr(product,1,6) = 'Oracle';

--9、查看数据库的创建日期和归档方式

SELECT created,log_mode,log_mode FROM v$database;

--查看表属于哪个表空间

SELECT TABLE_NAME,TABLESPACE_NAME FROM USER_TABLES;

--查询表空间下有哪些表

select * from all_tables where tablespace_name='T_SYS_AUTH_FEATURE_INFO_09'

二、修改表空间大小

1.通过sql plus 命令或者客户端登录数据库。

2.查看各表空间分配情况。

select tablespace_name,sum(bytes) / 1024 / 1024 from dba_data_files

group by tablespace_name;

3.查看各表空间空闲情况。

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

4.更改数据表大小(10G)

alter database datafile '/home/oracle/oradata/orcl/undotbs01.dbf' resize 10240m；

5.设置表空间不足时自动增长

5.1查看表空间是否自动增长

SELECT FILE_NAME,TABLESPACE_NAME,AUTOEXTENSIBLE FROM dba_data_files;

5.2 设置表空间自动增长

ALTER DATABASE DATAFILE '/home/oracle/oradata/orcl/undotbs01.dbf' AUTOEXTEND ON;//打开自动增长

ALTER DATABASE DATAFILE '/home/oracle/oradata/orcl/undotbs01.dbf' AUTOEXTEND ON NEXT 200M ;//每次自动增长200m

ALTER DATABASE DATAFILE '/home/oracle/oradata/orcl/undotbs01.dbf' AUTOEXTEND ON NEXT 200M MAXSIZE 1024M;//每次自动增长200m，数据表最大不超过1G