> I believe relational databases (Postgres is what I have experience with) has defaults that are basically correct, and unlikely to cause significant issues, wh

> I believe relational databases (Postgres is what I have experience with) has defaults that are basically correct, and unlikely to cause significant issues, whereas in my experience MongoDB did not have this. Strongly, strongly agreed. Learning every moving part in InnoDB (as an example) is quite a task. But not knowing about those features will rarely burn you, and it's usually apparent when you need to know something you don't. Meanwhile Mongo... well, Mongo says a replicated write is complete as soon as it's queued to be written. They eventually updated the default settings to be slightly less catastrophic, but still far from good. What you don't know about Mongo can and will hurt you, which arguably makes the appearance of ease a drawback. http://hackingdistributed.com/2013/01/29/mongo-ft/ http://hackingdistributed.com/2013/01/29/mongo-ft/