hard20 pts · first answer countsvector-searchmodel-serving

Tuning an HNSW vector index

You serve nearest-neighbour search over 50 million embeddings with an HNSW index. Recall@10 is too low. What happens if you increase the query-time parameter ef_search?

A.Recall goes up and query latency goes upB.Recall goes up and query latency goes downC.Recall goes down and index size goes upD.Nothing changes because ef_search only matters at build time

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Tuning an HNSW vector index

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