Redis Vector Search When Redis Is the Right Choice Redis is the correct default vector store when: - Your stack already uses Redis for cache / session / queue. - You need sub-10ms p95 on modest corpus sizes (< 10M vectors). - Vectors live alongside hot transactional data (user profiles, product records). - You want a single system for semantic cache and knowledge retrieval. Redis is a poor fit for: - Billions of vectors — RAM cost becomes prohibitive vs DiskANN stores. - Long-term archival storage with infrequent reads. - Analytics-style scans without ID-based access patterns. Redis Stack vs…