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Oracle数据库的回收站

Jun 07, 2016 pm 04:45 PM
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对于Oracle数据库,为了保证数据的安全性,我们需要设置好数据库的回收站功能,默认这个功能是开启的。我们可以通过以下步骤进行

对于Oracle数据库,为了保证数据的安全性,我们需要设置好数据库的回收站功能,默认这个功能是开启的。我们可以通过以下步骤进行查看和修改。

1 查看数据库是否设置了数据库的回收站(recyclebin 功能)

show parameter recyclebin;

SQL> show parameter recyclebin;

NAME                                TYPE        VALUE

------------------------------------ -----------

recyclebin                          string      on

2 如果这个value 是on 则表示已经开启的回收站功能,如果是off状态,则我们需要通过命令开启数据库的回收站功能。

开启和关闭recyclebin 的命令

开启reclebin 命令

查看状态

SQL> show parameter recyclebin;

NAME                                TYPE        VALUE

------------------------------------ ----------- ------------------------------

recyclebin                          string      OFF

修改会on状态,需要注意的是要指定scope=spfile,因为这个参数是不能再内存中修改的

SQL> alter system set recyclebin=on scope=spfile;

System altered

状态已经修改,我们需要重启数据库使得参数生效

SQL> alter system set recyclebin=on scope=spfile;

System altered

3 关闭数据库的回收站功能(因为修改的是spfile,需要重启数据库才会生效)

SQL> alter system set recyclebin=on scope=spfile;

System altered

4 清空回收站里面的数据

清空回收站里面的所有数据

SQL> purge recyclebin;

Done

清空具体的一个表

SQL> purge table dept;

Done

5 数据还原功能(最重要的),开启数据库的回收站功能就是防止误删除,可以进行数据的回收

flashback table BONUS to before drop;

重命名的方式进行数据的还原

flashback table SALGRADE to before drop  rename to SALGRADE_bak;

修改数据库中的表名

alter table SALGRADE_bak rename to SALGRADE

Oracle 11g 在RedHat Linux 5.8_x64平台的安装手册

Linux-6-64下安装Oracle 12C笔记

在CentOS 6.4下安装Oracle 11gR2(x64)

Oracle 11gR2 在VMWare虚拟机中安装步骤

Debian 下 安装 Oracle 11g XE R2

本文永久更新链接地址:

linux

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