November 2019
Beginner to intermediate
470 pages
11h 59m
English
Content preview from Mastering PostgreSQL 12 - Third Edition
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Inspecting connections and performance
While consulting, many people ask me whether raising the connection limit will have an impact on performance in general. The answer is: not much, as there is always some overhead due to context switches. It makes little difference as to how many connections there are. However, what does make a difference is the number of open snapshots. The more open snapshots there are, the more the overhead on the database side. In other words, we can increase max_connections cheaply.
If you are interested in some real-world data, consider taking a look at one of my older blog posts at https://www.cybertec-postgresql.com/max_connections-performance-impacts/.
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