# HnswOptions Optional request-level overrides for pgvector HNSW search settings. Unset fields inherit server defaults. - `efSearch` (`number | null`, optional): HNSW candidate list size (1..1000). - `iterativeScan` (`HnswIterativeScan | null`, optional): HNSW iterative scan mode. Use POST retrieve for this advanced tuning control. - `maxScanTuples` (`number | null`, optional): Maximum tuples to scan during iterative filtering (1..2147483647). - `scanMemMultiplier` (`number | null`, optional): Multiplier on work_mem for iterative scanning (1.0..1000.0). [TypeScript](../../typescript.md) Related types — open only those used by your request: - [HnswIterativeScan](HnswIterativeScan.md)