MongoDB World 2019: MongoDB Read Isolation: Making Your Reads Clean, Committed, and Repeatable
Isolation, the I in ACID, determines how/when the changes made by one operation become visible to another. Relational databases provide four isolation levels (uncommitted, committed, repeatable reads, and serialiable) to enable the trade off of performance versus the level of cross operation change visibility. In contrast, MongoDB’s isolation levels are controlled by using readConcerns and transactions. This talk will describe how the relational isolation levels compare to MongoDB’s isolation guarantees, how you configure MongoDB to provide the desired isolation level, and the performance implications.