Answer
Oplog timestamps and majority write acknowledgment ensure secondaries apply operations in the same sequence as the primary.
Quick Answer
MongoDB replication maintains ordering via the oplog - a capped collection where entries are ordered by a timestamp+counter (oplog timestamp). Secondaries apply oplog entries in strict order. This guarantees writes are replayed in the same order they happened on the primary. The oplog is the single source of truth for replication ordering across all secondary members.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ