Mean vs p99
Postgres FM · Nikolay Samokhvalov and Michael Christofides
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Show Notes
Nikolay and Michael discuss looking at queries by mean time — when it makes sense, why ordering by a percentile (like p99) might be better, and the merits of approximating percentiles in pg_stat_statements using the standard deviation column.
Here are some links to things they mentioned:
- Approximate the p99 of a query with pg_stat_statements (blog post by Michael) https://www.pgmustard.com/blog/approximate-the-p99-of-a-query-with-pgstatstatements
- pg_stat_statements https://www.postgresql.org/docs/current/pgstatstatements.html
- Our episode about track_planning https://postgres.fm/episodes/pg-stat-statements-track-planning
- pg_stat_monitor https://github.com/percona/pg_stat_monitor
- statement_timeout https://www.postgresql.org/docs/current/runtime-config-client.html#GUC-STATEMENT-TIMEOUT
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What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc!
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Postgres FM is produced by:
- Michael Christofides, founder of pgMustard
- Nikolay Samokhvalov, founder of Postgres.ai
With credit to:
- Jessie Draws for the elephant artwork