Choosing the Right Postgres Vector Index: HNSW, IVF, and Exact Search Trade‑offs
This guide explains how scaling vector search in PostgreSQL shifts from simple exact scans to approximate nearest‑neighbor indexes and maps memory, recall, write load, and filter selectivity constraints to specific index types such as HNSW, IVF, and exact search. It helps engineers pick the appropriate index for millions‑row workloads while balancing latency and accuracy.