Summary

This chapter explored ACID-compliant multi-document transactions in MongoDB. You learnt the principles of the ACID transaction paradigm. Further, you saw how MongoDB handles these requirements, including the strictest requirements, which are sometimes unavoidable. You also learned when to use transactions, when it's best to avoid them, how to use them, their best practices, their limitations, and how to mitigate them.

You followed a simple yet illustrative transaction example, and tested a transaction from the MongoDB Shell. You explored the transaction behavior from within, and observed how it looks like from outside the transaction. You also saw how a transaction is committed, and how to handle failure conditions that require the transaction to be aborted.

The next chapter will address key facets of the MongoDB document model, encompassing indexing, index optimization, and its impact on your overall system.