Everything was fine, but we forgot to put a boundary point in for Jan 1, 2016… and now it’s well into January. All our data for January 2016 is in the partition with the December data.
The more time passes, the more data is going to go into that partition, and it’ll get bigger and more lopsided. If we’re switching out old partitions by month, eventually that’s not going to work. And partition elimination won’t work for anything after Dec 1, 2015, either!
Be sure to keep those empty partitions around, just in case .