Answer
Multi-document operations and unindexed writes can cause lock contention. Use indexes and smaller writes to avoid locking.
Quick Answer
WiredTiger uses document-level locking so multiple operations can write to the same collection concurrently without blocking each other. Collection-level locking only happens for certain operations like createIndex or collMod. Avoid these in production on large collections. In older MMAPv1, collection-level locking caused severe write contention under concurrent load.
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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