MongoDB 4.2 Brings Fully Distributed ACID Transactions (MongoDB World 2019 Keynote, part 2)

June 27, 2019
CTO Eliot Horowitz introduces Distributed Transactions, new in MongoDB 4.2, followed by an under-the-hood demonstration by Senior Software Engineer Esha Maharishi. The ACID guarantee MongoDB provides for single-document updates makes transactions unnecessary in the majority of use cases, but sometimes you just need a reference relationship with ACID guarantees. Distributed Transactions allow these use cases to be implemented easily, whether your distributed cluster is composed of 2 shards or 2,000. They are use the same simple, familiar, conversational syntax introduced in MongoDB 4.0 for replica set transactions. In MongoDB 4.2, Distributed Transactions mean that you can: - Execute large transactions, with an arbitrarily large update size - Update the value of a document's shard key - Update the location affinity of a document in an Atlas Global Cluster https://www.mongodb.com/new
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