一般都会用imp exp 备份和导入数据库 但是有些时候 需要比较灵活的从两个数据库之间取数据 我这里用到的是oralc的dblink方式。首
Oracle 用dblink 跨库导数据
[日期：2011-08-02] 来源：Linux社区 作者：zhouxingfu [字体：]
一般都会用imp exp 备份和导入数据库 但是有些时候 需要比较灵活的从两个数据库之间取数据 我这里用到的是oralc的dblink方式。
首先监听器tnsnames.ora这个文件能连接到远程要创建dblink的数据库。
-- 创建dblink MANAGER为远程数据库的用户名 password 为远程数据库的密码， orcl为监听器连好的链接名称
这样就可以连接到 orcl数据库 灵活的取每一张表的数据了
--两个数据库都存在 tb_demo表 这是本表插入
--查询数据 sql和本地一样了 只是后面加个@DDD.REGRESS.RDBMS.DEV.US.ORACLE.COM 就等于是dblink连好的远程数据库了
Oracle 数据大小超出此类型的最大值：2736
Oracle 10g 建表空间 授权 ,自动备份，恢复
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