The correct steps for PLSQL to import and export tables
It turns out that tools->import talbes->Oracle Import is always directly, and it turns out that sometimes there will be errors: some tables cannot be imported correctly. The solution of baidu+googel is as follows:
Export steps:
1 tools ->export user object select option, export .sql file
2 tools ->export tables-> Oracle Export select option to export .dmp file
Import steps:
1 tools->import tables->SQL Inserts import .sql files
2 tools->import talbes->Oracle Import and then import the dmp file
The database import and export are successful
======================= Explanation========================= ==========================================
Tools->Export User Objects export is to build a table statement (including storage structure)
Tools->Export Tables contains three export methods:
The three methods can export the table structure and data. The Internet says that the three methods are different, as follows:
Oracle Export，Sql Insert，pl/sql developer
第一种是导出为.dmp的文件格式，.dmp文件是二进制的，可以跨平台，还能包含权限，效率也很不错，用得最广
第二种是导出为.sql文件的，可用文本编辑器查看，通用性比较好，但效率不如第一种，适合小数据量导入导出。尤其注意的是表中不能有大字段（blob,clob,long），如果有，会提示不能导出(提示如下：
table contains one or more LONG columns cannot export in sql format,user Pl/sql developer format instead)，可以用第一种和第三种方式导出。 第三种是导出为.pde格式的，.pde为Pl/sql developer自有的文件格式，只能用Pl/sql developer自己导入导出；不能用编辑器查看。
个人比较中意第二种方法，毕竟是SQL文件嘛，自己还可以看，想改也方便