Databricks benchmarks Lakebase Search vector latency at 1M–4M passages
Cache-to-index ratio, not raw row count, is the variable that governs vector search latency, which is easy to miss when scaling a RAG corpus. Engineers running Lakebase or similar Postgres-backed vector stores can use the 11–23 ms warm p50 figures to set cache budgets before latency degrades. It offers concrete sizing guidance rather than vendor marketing.
