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PostgreSQL 17 as a Universal Vector Database: Benchmarking pgvector at 100M Embeddings

A detailed hardware and index benchmark: Why specialized vector databases are losing ground to modern HNSW and memory-mapped indexes in core Postgres.

Rafael Alcantara

Lead Database Systems Engineer · 7 min read ·

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Narrated by Rafael Alcantara (Database Engineering Audio)
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Learning Objectives & Key Takeaways

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Query Throughput
4,800 QPS at 99% Recall
Verified: p99 < 8.4ms
What you will learn
  1. PostgreSQL 17 memory management boosts parallel HNSW index building speed by 3.8x over PG 16.
  2. Avoid dual-database syncing headaches: combine relational ACID metadata and 1536-dim vector searches in a single SQL query.
  3. Iterative index scans eliminate recall degradation when combining strict WHERE filters with cosine similarity.

Series: Modern Database Internals (Part 1 of 4)

1. The ACID + Vector Convergence

Specialized vector databases promised unconstrained scale, but created severe data synchronization friction, dual-write failures, and fractured security access controls.

Postgres 17 solves this with enhanced HNSW indexing, parallel build workers, and zero-overhead relational filtering.

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Written by

Rafael Alcantara

Lead Database Systems Engineer. Contributing deep-dive engineering architectures, cloud paradigms, and system design insights to Master Class Buddy.