V · Vector DB · voice AI

Vector database

A database optimised for similarity search on high-dimensional vectors.

In one sentence

A vector database is a storage system optimised for indexing and querying high-dimensional vectors (typically embeddings), so semantic similarity searches return results in milliseconds at scale.

When it matters

When the corpus exceeds a few thousand documents and a brute-force scan is no longer fast enough.

A real-world example

helpcode KB runs on Postgres with pgvector — boring, EU-hostable, no separate vector DB to operate or audit.

Curated by helpcode research team · Last reviewed 2026-05-22