> At its core, MongoDB is a document database and — almost by default — these kind of databases aren’t ACID compliant, especially when it comes to multi-documen

> At its core, MongoDB is a document database and — almost by default — these kind of databases aren’t ACID compliant, especially when it comes to multi-document transactions. For the most part, that’s not a big deal for companies that use database systems like MongoDB because they are not trying to write to multiple documents at the same time. No. At least in the open-source world, you can see many applications make multi-document "transactions". I don't see how it would be different in companies using MongoDB. > Because of this, though, many MongoDB users still run relational databases in parallel with their document database. No. For the most part, they do write to multiple documents and not think about consistency. At least the situation seems to be getting remedied. Better late than never.