Sunday, August 19

Tag: tuning

Autovacuum Tuning Basics

2ndQuadrant, PostgreSQL, Tomas' PlanetPostgreSQL
A few weeks ago I covered the basics of tuning checkpoints, and in that post I also mentioned that the second common source of performance issues is autovacuum (based on what we see on the mailing list and at our customers under support). So let me follow-up on that with this post about the basics of autovacuum tuning. I'll very briefly explain the necessary theory (dead tuples, bloat and how autovacuum deals with it), but the main focus of this blog post is tuning - what configuration options are there, rules of thumb, etc. (more…)

Basics of Tuning Checkpoints

2ndQuadrant, PostgreSQL, Tomas' PlanetPostgreSQL
On systems doing non-trivial number of writes, tuning checkpoints is crucial for getting good performance. Yet checkpoints are one of the areas where we often identify confusion and configuration issues, both on the community mailing lists and during performance tuning reviews for our customers. (The other one being autovacuum, discussed a few days ago by Joe Nelson from Citus.) So let me walk you through the checkpoints - what they do and how to tune them in PostgreSQL. (more…)