Oracle基础(一）:表空间和数据文件

1.--创建tablespace

create (undo|temporary) tablespace byy

logging

datafile '/export/home/oracle/biyy/biyy.dbf'

size 32m

autoextend on

next 32m maxsize 2048m

extent management local;

2.--创建用户并指定表空间

create user hr identified by hr

default tablespace byy

temporary tablespace temp;

create user hr identified by hr1

default tablespace byy

temporary tablespace temp

quota 10M on byy

password expire; --用户会在初次登录的时候被提示修改密码

3.--删除用户

drop user 用户名 cascade --级联删除掉该模式中的所有对

4.--限制具有select any table的用户不能访问系统字典表

o7_dictionary_accessibility = false

5.--将dictionary-managed tablespace 改成local managed tablespace执行下列pl/sql包

DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_TO_LOCAL('SYSTEM')

##Make a complete backup of your database;

##Ensure that the database has a default temporary tablespace that is not SYSTEM.

The temporary tablespace is created using the create temporary tablesapce command

##Elimanate any undo(rollback) segments in dictionary-managed tablespaces;

##There should be at least one online undo segment in a locally managed tablespace.or

an undo tablespace should be online;

##All tablespaces other than the tablespace containing the undo space the default

temporary tablespace should be placed in READ ONLY mode;

##Start up the instance in restricted mode;

##Migrate the SYSTEM tablespace by using

DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_TO_LOCAL('SYSTEM');

6.--修改默认临时表空间

alter database default temporary tablespace default_temp2;

##临时表空间不能被离线

##不能被drop直到有新的临时表空间被创建(至少有一个临时表空间存在)

##不能被alter成永久表空间(permanent tablespace)

7.--修改表空间为只读(读写)

alter dataspace userdata READ ONLY(read write)

##Causes a checkpoint

##Data available only for read operations

##Object can be dropped from tablespace(因为修改的dictionary)

8.--显示当前用户

show user;

9.--修改表空间离线/在线

alter tablespace tablespace1 offline(online);

10.--调整表空间大小

##Automatically using autoextend

alter database datafile 'data.ora'

autoextentend on next 20M maxsize 1000M

##Manually using Alter Database

alter tablespace tablespace_name

add datafile 'Data2.ora' size 200M

##Adding a data file using Alter tablespace

alter tablespace user_data

datafile

'/u01/oradata/userdata02.dbf' size 200M

autoextentend on next 10M maxsize 500M

alter database

datafile '已有的数据文件的文件名'

autoextentend on next 10M maxsize 500M

##Manually Resizing Data File(用于缩小数据文件，不能缩小到比实际数据小)

Alter database

Datafile 'u02/oradata/userData02.dbf'

Resize 200M

11.--移动数据文件(与redo logfile rename 对比)

##两种方式：一种是通过修改tablespace，另外一种是通过database

##Tablespace must be offline;

##Target data files must exist.copy the old file to the new target

alter tablespace userData RENAME

Datafile '/u01/oradata/userdata01.dbf'

To '/u02/oradata/userdata02.dbf';

##Database must be mounted

##Target data file must exist

Alter database rename

file '/u01/oradata/system01.dbf'

to '/u03/oradata/system01.dbf'

12.--删除表空间

drop tablesapce XXX 仅去除关联

including contents 并且删除内容

including contents and datafiles 并且删除文件

cascade constraints 级联删除约束