码迷,mamicode.com
首页 > 其他好文 > 详细

存储管理

时间:2017-08-15 21:15:45      阅读:141      评论:0      收藏:0      [点我收藏+]

标签:and   文件   _id   upd   span   dbf   失败   drop   maxsize   

技术分享

查询预定义表空间:

SQL> select TABLESPACE_NAME,CONTENTS from dba_tablespaces;

SQL> select FILE_NAME, TABLESPACE_NAME from dba_data_files;

创建新表空间:

SQL> create tablespace tbs01 datafile ‘/u01/app/oracle/oradata/orcl/tbs01.dbf‘ SIZE 10M AUTOEXTEND ON NEXT 10M MAXSIZE 100M;

在指定的表空间中创建表:

SQL> create table t1 tablespace tbs01 as select * from dba_objects where 1=0;

SQL> select bytes, blocks, extents, tablespace_name from dba_segments where segment_name=‘T1‘;

SQL> insert into t1 select * from dba_objects;

SQL> select bytes, blocks, extents, tablespace_name from dba_segments where segment_name=‘T1‘;

SQL> select extent_id, bytes, blocks from dba_extents where segment_name=‘T1‘;

SQL> insert into t1 select * from t1;

SQL> insert into t1 select * from t1;

SQL> insert into t1 select * from t1;

SQL> select bytes, blocks, extents, tablespace_name from dba_segments where segment_name=‘T1‘;

SQL> select extent_id, bytes, blocks from dba_extents where segment_name=‘T1‘;

SQL> insert into t1 select * from t1; 空间不足,报错

SQL> rollback;

SQL> select bytes, blocks, extents, tablespace_name from dba_segments where segment_name=‘T1‘; 空间不释放

SQL> alter table t1 move; 释放空间

只读表空间:

SQL> alter tablespace tbs01 read only;

SQL> delete t1; 禁止dml

SQL> insert into t1 select * from t1; 禁止dml

SQL> update t1 set x=1; 失败

 

SQL> create table t2 (x int) tablespace tbs01; 失败

SQL> alter table t1 add (x int); 成功

SQL> drop table t1; 成功

dml和ddl的区别

 

改变表空间大小:

resize,直接调整数据文件大小(推荐)

autoextend,自动扩展

add datafile添加数据文件 后期添加的话会自动负载均衡

 

删除表空间:

SQL> drop tablespace tbs01 including contents and datafiles;

存储管理

标签:and   文件   _id   upd   span   dbf   失败   drop   maxsize   

原文地址:http://www.cnblogs.com/shan2017/p/7367381.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!