TAG
#pgvector
2026-10 2 posts
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What Happens to HNSW Recall After Adding Vectors? (1M+1M)
A 1M+1M insertion study in pgvector and Qdrant, comparing insertion order, batch boundaries, and fresh indexes. Segment telemetry and version-pinned code help explain their different behavior.
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What Happens to HNSW Recall After Adding Vectors? (10K+10K)
A small pgvector and Qdrant experiment compares recall before and after vector insertion, then against fresh indexes over the same final data.
2026-05 2 posts
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PG-Strom SSB Benchmark — Arrow FDW Comes Before GPU
555 test cases on three servers: on heap storage PG-Strom's GPU gave 1.6x and lost to CPU on wide tables; with Arrow FDW it hit 10x at SF=100.
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Replacing Elasticsearch with PostgreSQL
Korean hybrid search on PostgreSQL alone (MeCab, BM25, pgvector, in-DB RRF) over eight phases: Elasticsearch-level quality, 2–5x faster on one node.
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