Oracle从dump文件中提取DDL语句方法
Oracle dump文件的命令有exp/imp和expdp/impdp。对于dump文件，我们不能直接提取出data数据，但是我们可以通过相关的参数，从dum
Oracle dump文件的命令有exp/imp和expdp/impdp。对于dump文件，我们不能直接提取出data数据，但是我们可以通过相关的参数，，从dump文件中提取出对应的DDL语句。
Oracle 从Dump 文件里提取 DDL 语句 方法说明
如果是导出导入(exp/imp)，那么是indexfile参数；
如果是数据泵(expdp/impdp)，那么是sqlfile参数。
expdp/impdp提取出的DDL语句更详细，可读性更好。
一、使用exp/imp命令
1、导出lxh用户的数据，生成dump文件
exp lxh/lxh file=lxh.dmp owner=lxh
2、从dump文件里提取DDL语句
imp lxh/lxh file=lxh.dmp fromuser=lxh touser=lxh indexfile=lxh.sql
该import命令并没有真正的import data，而只是生成了我们对应用户下所有DDL的sql语句。对于表的DDL语句，用REM进行了注释。
二、使用expdp/impdp命令
1、导出lxh用户的数据，生成dump文件
expdp lxh/lxh directory=backup dumpfile=lxh.dmp schemas=lxh
2、从dump文件里提取DDL语句
impdp lxh/lxh directory=backup dumpfile=lxh.dmp sqlfile=lxh.sql
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