==导出一个完整数据库[结构+数据]========
exp system/password file=/u01/20101115.dmp log=/u01/20101115.log full=y
==只导出数据库的结构而不导出里面的数据=====
exp system/password file=/u01/20101115.dmp log=/u01/20101115.log full=y rows=n
==导出用户admin的所有数据=========
exp system/password file=/u01/20101115.dmp log=/u01/20101115.log owner=admin
==如：同时导出admin和visitor两个用户的所有对象===
exp system/password file=/u01/20101115.dmp log=/u01/20101115.log owner=(admin,visitor)
==只导出一个Table,如只导出admin用户下面的testtable表=
exp admin/adminpassword file=/u01/20101115.dmp log=/u01/20101115.log tables=testtable
==如果需要导出多个表==================================
exp admin/adminpassword file=/u01/20101115.dmp log=/u01/20101115.log tables=(table1,table2,table3)
exp system/password file=/u01/20101115.dmp log=/u01/20101115.log tables=(admin.testtable,visitor.table1)