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Showing posts from September, 2015

PostgreSQL hot standby feedback. How it works.

From time to time, people come to us with a problem, "Our queries cancelled on standby servers, and we enabled hot_standby_feedback, but queries on standby get cancelled. Why?". Indeed, after reading the documentation, it may seem that the feedback solves query cancelling problems, and if it is enabled the conflicts will disappear. However, this is not true. In this article we take a look at the feedback, how it works and which problems it is intended to solve.