I don't remember, it was ~4 years ago and for a different company. I believe there were a small number of incompatibilities somewhere (composite indexes maybe? I remember doing stuff with them but don't remember why, could have just been for query optimisation) and a few areas where the performance was degraded (again, I think around indexes, but I could be mistaken).
It wasn't a big deal over all, but it wasn't simple plug'n'play either and required some porting work.
It wasn't a big deal over all, but it wasn't simple plug'n'play either and required some porting work.