Tiger Data ships pg_vectorsearch with PRISM index for PostgreSQL

Tiger Data, the company behind TimescaleDB, released pg_vectorsearch, an open-source PostgreSQL 18+ extension with a new PRISM index. On 100M embeddings it builds in 1 hour 40 minutes and takes 25 GB versus 42 hours and ~180 GB for pgvector's HNSW; the release is alpha quality.

• PRISM builds a 100M-vector index in 1h40m on a 128 GiB machine
• PRISM index is 25 GB versus ~180 GB for HNSW
• 6 ms median query latency at 95% recall versus 8 ms for HNSW
• Alpha limits: no filtered search, manual rebalance under churn