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oracle下逻辑的导入导出工具exp/imp

Jun 07, 2016 pm 05:42 PM
oracle import Export tool logic

oracle下逻辑的导入导出工具exp/impexp/imp简介:exp/imp是oracle幸存的最古老的两个命令行备份工具,在小型数据库的转储、表空间的迁移、表的抽

oracle下逻辑的导入导出工具exp/imp

exp/imp简介:

        exp/imp是oracle幸存的最古老的两个命令行备份工具 ,在小型数据库的转储、表空间的迁移、表的抽取、检测逻辑和物理冲突中使用非常广泛,我们可以把它作为小型数据库的物理备份后的一个逻辑备份。它可以跨平台、跨版本。

exp/imp的工作原理:

        exp用户进程通过服务器进程连接到数据库,开启shadow进程,同时执行select语句查询数据库中的数据,通过buffer cache并通过SQL语句处理层再转移出exp导出文件,即exp进程需要占用服务器上的SGA和PGA资源。

        imp读取exp导出的.dmp文件,虚拟主机,构造DDL语句,插入创建表与其他对象以及添加数据的语句

exp的导出数据的方式:

        1、全库导出(这种方式一般不用)

        2、按用户导出

        3、按表导出

exp常用参数简介:exp help=y

3、按表导出

    

 oracle下逻辑的导入导出工具exp/imp

4、在导出是,只导出表结构不导出数据

    

 oracle下逻辑的导入导出工具exp/imp

exp工具的缺点:

        速度慢,由于exp连接到数据库需要先select要导出的数据,再通过SGA、PGA传输给exp。

        如果此连接断开,网站空间,则exp需从头开始导出,没有断点续传的功能

        消耗服务端资源,只能服务端业务的前提下使用

imp 常用参数:imp help=y

 oracle下逻辑的导入导出工具exp/imp

    

导入数据,将导出的数据导入到windows平台的oracle 11g 64位中

        使用11g客户段导入数据

1、按用户导入

      imp   system/oracle@orcl     fromuser=lck     touser=lck    file=d:\lck_tables.dmp;      

    再导入

 oracle下逻辑的导入导出工具exp/imp

  又报错了,对data表空间没权限,因为没有给lck用户分配在data表空间上的配额,香港空间,其实现在表结构已经导进来了,看一下

    

 oracle下逻辑的导入导出工具exp/imp

      好吧,那就再给lck的配额,再导入      

 oracle下逻辑的导入导出工具exp/imp

 啊,还是报错,对象已存在,加参数ignore=y (忽略创建错误),再导入

 oracle下逻辑的导入导出工具exp/imp

  ok,导入成功,  原来导入数据不是一帆风顺的啊。

    总结:导入数据前需要在目标数据库中创建对应的用户,并给用户相应的权限和该用户在自己默认表空间上的配额

2、按表导入

    exp system/oracle@orcl  talbes=tab1  fromuser=lck,test  touser=lck,test file=d:\lck_test_tables.dmp  

 oracle下逻辑的导入导出工具exp/imp

ok,导入成功!!

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