Import and export between versions of Oracle

The conversion of the old and new platform, need to import the old database data into the new database library, due to different versions, looked up some information

Due to the operational principles of Oracle's IMP/EXP components-backwards compatible, there are some rules:
Rule 1: A low version of Exp/imp can connect to a higher version (or the same version) of the database server, but the higher version of Exp/imp cannot connect to the lower version of the database server;
Rule 2: High version exp out of DMP file, low version cannot imp (cannot recognize DMP file); Low version exp out DMP file, high version can imp (backwards compatible);
Rule 3: Data from Oracle's low version of export can be import into Oracle high, but is limited to adjacent versions of Oracle, such as Oracle 10 to Oracle 11. For conversions between two nonadjacent versions,
If you are from Oracle 9 to Oracle 11, you should first enter the data into intermediate version-oracle 10, and then transfer from the intermediate database to a later Oracle 11

Import and export between versions of Oracle