Answer
MongoDB uses two-phase commit, snapshot isolation, and transaction logs to ensure atomic multi-document operations.
Quick Answer
MongoDB multi-document transactions use snapshot isolation (read your own writes, consistent view of data as of transaction start). Internally: WiredTiger takes a snapshot at transaction start, all reads see the snapshot, writes are buffered and committed atomically. On commit, WiredTiger checks for write-write conflicts - if another transaction modified the same document, one is aborted and must retry.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ