Eric S notapenguin's blog: "Journaling and FUBar-Specific"

and it can take awhile. (Immediately in reference to moving the rating network - "A has rated B this much etc. etc.", I don't know what information they store but it's certainly multidimensional, hence consider an array the size of the number of users of the site, squared, at least- configurations may need changing on the new machine, also... this again, at least)