Answer
MongoDB uses WiredTiger’s document-level locking where each document has an independent lock, enabling simultaneous writes across different documents and avoiding collection-level contention.
Quick Answer
WiredTiger uses document-level optimistic concurrency. Multiple readers and writers can proceed in parallel without blocking each other. Conflicts are detected at commit time (if two transactions write to the same document, one gets a WriteConflict error and retries). This is far better than the old MMAPv1 collection-level locking that serialized all writes to a collection.
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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