How does MongoDB achieve ACID compliance across multiple documents given its distributed nature?

Difficulty: 7/10

multi-document transactions, sharding, write concern

MongoDB achieves distributed ACID compliance through multi-document transactions using snapshot isolation, two-phase commit across shards, and majority write concern for durability.

MongoDB achieves ACID (Atomicity, Consistency, Isolation, Durability) compliance across multiple documents through multi-document transactions, introduced in version 4.0 for replica sets and extended to sharded clusters in version 4.2. These transactions provide snapshot isolation, ensuring all read operations within a transaction see a consistent view of data across multiple documents, even in distributed environments.

Multi-Document Transaction Example

Key Mechanisms for ACID Compliance

1
Snapshot isolation: Transactions read from a consistent snapshot taken at the start, preventing dirty reads and ensuring repeatable reads across nodes
2

How does MongoDB achieve ACID compliance across multiple documents given its distributed nature?

Difficulty: 7/10

multi-document transactions, sharding, write concern

MongoDB achieves distributed ACID compliance through multi-document transactions using snapshot isolation, two-phase commit across shards, and majority write concern for durability.

Multi-Document Transaction Example

Key Mechanisms for ACID Compliance

1
Snapshot isolation: Transactions read from a consistent snapshot taken at the start, preventing dirty reads and ensuring repeatable reads across nodes
2

How does MongoDB achieve ACID compliance across multiple documents given its distributed nature?

MongoDB achieves distributed ACID compliance through multi-document transactions using snapshot isolation, two-phase commit across shards, and majority write concern for durability.

How does MongoDB achieve ACID compliance across multiple documents given its distributed nature?

MongoDB achieves distributed ACID compliance through multi-document transactions using snapshot isolation, two-phase commit across shards, and majority write concern for durability.

Scenario Questions

Follow-up Questions