by Colin Fraser.
AFAIK, the structures of the database are the same, so there is no problem... but having said that, the last time I was involved in such a change, from MySQL to Postgres, was about v2.3, I think, and it was the whole database. The tech guys just did a data dump/backup of the of the entire database and uploaded the file to the new one, went like a dream I was told, but I don't know what prep work was done before hand, so there's no reason why that shouldn't happen. Essentially, the database structure should be the same so if the dump is in an SQL format, which it should be, should translate properly. Postgres' handling routines are likely different to MySQL, I understand, but it is compliant with the latest SQL standards.