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Yes. No problems whatsoever.
When I logged a ticket with Oracle Support I got a different answer, namely to upgrade to 7.0 then 8.2. Anyone know why?
This is due to the schema changes. The database upgrade script are designed in that manner for both automatic and manual upgrade. or you can say that is the upgrade path defined by Oracle.
They were wrong. 8.2 allows you to upgrade directly from 6.2.1 (but nothing earlier). FYI - there's no MM (Methodology Manager) in 8.2. So you would want to convert anything in MM to projects before upgrading. And it's never a bad idea to run the validate program (database folder) before upgrading.
Edit - last time I checked, the unattended scripts weren't working from 6.2.1. A ticket was submitted for them to fix, but I don't know if they did. So AFAIK, you will have to do the upgrades manually. That is, you need to to launch it and guide it through the process. ~20 minutes for an average sized database.
Edited by: ITPM on Sep 12, 2012 6:33 PM
There are no issues following the upgrade path from 6.2.1 to 8.2, just make sure that you've run the validate schema tool before you commence your upgrade and again once you've completed the 8.2 upgrade.
The upgrade can be done without issue, please refer to the following Primavera documentation in the OTN or to the following link
Upgrading and Configuring P6 EPPM
Automatic Database Upgrade Considerations and Prerequisites Page 17