pg_hdr_histogram 1.0.0 - exact percentiles in PostgreSQL
pg_hdr_histogram is a PostgreSQL extension for exact-latency percentiles.
Most monitoring tools approximate percentiles from fixed buckets. pg_hdr_histogram stores a full HDR histogram as a first-class type, so p50 / p99 / p99.9 are measurements (~0.1% relative precision over 6 orders of magnitude), not estimates — and histograms merge losslessly across time windows and hosts.
- Built on HdrHistogram_c.
- Aggregates
hdr_addandhdr_merge, parallel-safe,trusted = true. - Author: Vladimir Pavliv.
原文：https://www.a8q9.cn/en/article/pg-hdr-histogram-1-0-0-exact-percentiles-in-postgresql-293ccc.html