10g Upgrade Order (DEV - QAS - PRD)

If I am upgrading Oracle 9.2.0.6 to 10.2.0.2, what issues will I face if I upgrade the landscape in the order of DEV, QAS, PRD.
I will wait a week between upgrades.
Will transports fail?
Will SAP face any issues having different Oracle versions?
Do I have to upgrade DEV, QAS, PRD at the same time?

-> transports will not fail as long as the sap release will not change...
-> normally all sap systems should run smoothly on supported database platforms...10g should be no problem...the three system reside on different hosts?
to be sure (sap states that different kernel releases within one system landscape can lead to problems) try to keep the time between QAS and PRD very short and avoid transporting...
-> no, you don't have to upgrade all systems at the same time...a week between DEV and QAS is enough
GreetZ, AH

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