並不是所有的9i的object都可以很好的導入到8i的，因為有些新的object type等等，在9i裡面有，但是在8i的時候根本還沒出現。
Migrate to a different release of the Oracle database: When you are upgrading to a
new release of Oracle server, data can be exported from the older release and
imported into the new release. Note that it may not be possible to use this method
for moving data from a later release to an earlier release.
最初由 oracle-plus 发布
[B]並不是所有的9i的object都可以很好的導入到8i的，因為有些新的object type等等，在9i裡面有，但是在8i的時候根本還沒出現。
Migrate to a different release of the Oracle database: When you are upgrading to a
new release of Oracle server, data can be exported from the older release and
imported into the new release. Note that it may not be possible to use this method
for moving data from a later release to an earlier release. [/B]
做做业务表的数据转移还是没什么问题的
