This is exactly what people call ACID TRANSACTION. Which completely lacked on Mongo. MySQL also lacked this, so people had to deal with data loss until they get

This is exactly what people call ACID TRANSACTION. Which completely lacked on Mongo. MySQL also lacked this, so people had to deal with data loss until they get InnoDB. Next time you choose a database, always check the ACID compliance. It will make your life far easier.