EXP-00008: 遇到 Oracle 错误 904
发生EXP-00008: 遇到 ORACLE 错误 904 的导出报错。根据网上的资料和总结，分析可能是本地使用的exp导出工具的版本与数据库服务器
案例情景——在一次Oracle 数据库导出时：
Export: Release 11.2.0.1.0 - Production on 星期一 11月 26 14:07:18 2012 Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
ORA-00904: "POLTYP": invalid identifier
EXP-00000: 导出终止失败
发生EXP-00008: 遇到 ORACLE 错误 904 的导出报错。
根据网上的资料和总结，分析可能是本地使用的exp导出工具的版本与数据库服务器端exp版本不一致导致。
在命令操作中发现，本地安装的Oracle 版本是Release 11.2.0.1.0，而数据库服务器端安装的Oracle 是Release 10.2.0.4.0 。
由于Oracle的imp/exp组件的操作原则——向下兼容，且有一些规则：
规则1：低版本的exp/imp可以连接到高版本（或同版本）的数据库服务器，但高版本的exp/imp不能连接到低版本的数据库服务器;
规则2：高版本exp出的dmp文件，，低版本无法imp（无法识别dmp文件）；低版本exp出的dmp文件，高版本可以imp（向下兼容）;
规则3：从Oracle 低版本Export的数据可以Import到Oracle高版本中，但限于Oracle的相邻版本，如从Oracle 10 到 Oracle 11。对于两个不相邻版本间进行转换，如从Oracle 9 到 Oracle 11，则应先将数据输入到中间版本—Oracle 10，再从中间数据库转入更高版本Oracle 11。
据此，最快捷的解决方案就是使用安装了10g Oracle 的机子，进行服务器上数据库数据的导出。
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