This question is in reference to Atlassian Documentation: Migrating JIRA to Another Server
My question about "3.3 Connect the new version of JIRA to a new, empty database"
Is it possible, connect to other type of database and then migrate data from old database to new, or both databases should be the same type?
You'd have to get them all on the same version of JIRA first. Upgrade 3.3.8 to 7, upgrade 4.3.4 to 7 and then migrate both to a new JIRA 7 instance, or import one of the upgraded instances into the other.
You can't go direct to 7 from 3.3.8, you'd need to upgrade that to 4.4.5 first and then to 7. I think 4.3.4 can go straight to 7. More details at https://confluence.atlassian.com/jira/upgrading-jira-185729508.html and https://confluence.atlassian.com/jira/upgrading-jira-manually-235670607.html
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