That kind of depends on your needs. Since the documents are hierarchical, and can be self-contained (depending on design), you can get a write receipt from Mong

That kind of depends on your needs. Since the documents are hierarchical, and can be self-contained (depending on design), you can get a write receipt from MongoDB. I think the necessity of ACID applies more to relational databases that are updating multiple related records. If you really need an ACID like transaction in MongoDB, you have to do it in your software and check the write receipts. Of course this can fail if the database server suddenly goes down, but with MongoDB you should be using replica sets anyways.