MongoDB's journal is another collection that only syncs to disk 10 times a second. It's not a true journal like a write-ahead log. You can force that collection

MongoDB's journal is another collection that only syncs to disk 10 times a second. It's not a true journal like a write-ahead log. You can force that collection to fsync, but... yeah, I get get stupendous performance using a cheap RAID controller on commodity hardware with an old and busted relational database. Hooray for 40 years of technology!