Difference between upgrdae and migration about oracle database

Difference between upgrdae and migration about oracle database
please give the comments

Well, the question is almost philosophic...<br>
In 9i, there is a Migration Guide whereas in 10g there is a Upgrade Guide.<br>
Furthermore, in 9i, there is the command line startup migrate whereas in 10g that's startup upgrade.
Somebody think upgrade when go to new release, and migration when go to new version.<br>
Others think upgrade when new version replace database in place, and migration when new version include a move of database.<br>
Another point of view is : upgrade is for technical, and migration for application/data.<br>
<br>
Well, after these explanations, your upgrade/migratation notion will not be more clear, but I think that is not very important, only a terminology game. The most important is to know what you need : new version or new release.<br>
<br>
Nicolas.

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