Transaction support in MongoDB

Question

I am new to MongoDB. I read that MongoDB does not support multi-document transactionshere http://docs.mongodb.org/manual/faq/fundamentals/.

If I want to save data in two collections(A and B) atomically, then i can't do that using MongoDB i.e. if save fails in case of B, still A will have the data. Isn't it a big disadvantage?

Still, people are using MongoDB rather than RDBMS. Why?

Answer 1

MongoDB does not support multi-document transactions.

However, MongoDB does provide atomic operations on a single document. Often these document-level atomic operations are sufficient to solve problems that would require ACID transactions in a relational database.

For example, in MongoDB, you can embed related data in nested arrays or nested documents within a single document and update the entire document in a single atomic operation. Relational databases might represent the same kind of data with multiple tables and rows, which would require transaction support to update the data atomically.

Answer 2

Starting from version 4.0 MongoDB will add support for multi-document transactions. So you will have the power of the document model with ACID guarantees in MongoDB. Transactions in MongoDB will be like transactions in relational databases.

For details visit this link: https://www.mongodb.com/blog/post/multi-document-transactions-in-mongodb?jmp=community