beginnerMongoDB Transactions — Single & Multi-Document ACID
Did MongoDB documents need a transaction to be atomic before multi-document transactions existed?
No — any single write to a single document, even one touching deeply nested fields or array elements, was always atomic with no transaction needed; MongoDB guarantees the whole document either fully updates or doesn't change at all. Multi-document transactions (since 4.0/4.2) only extend that same guarantee across separate documents, collections, or databases.
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