October 2010
Intermediate to advanced
468 pages
11h 35m
English
Content preview from PostgreSQL 9.0 High PerformanceBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Buffer, background writer, and checkpoint activity
Monitoring gross activity in the database buffer cache was very difficult until PostgreSQL 8.3, where the pg_stat_bgwriter view was introduced. This allows tracking the general flow of every data page buffer that goes in or out of the cache, along with statistics about the related checkpoint process responsible for much of that. Some questions you can answer with this data include the following:
- What percentage of the time are checkpoints being requested based on activity instead of time passing?
- How much data does the average checkpoint write?
- What percentage of the data being written out happens from checkpoints and backends, respectively?
It's possible to compute these numbers easily enough right ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.