May 2019
Intermediate to advanced
600 pages
20h 46m
English
book
PostgreSQL 11 Administration Cookbook
by Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala, Sheldon Strauch
Content preview from PostgreSQL 11 Administration Cookbook
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How it works…
The pg_terminate_backend() function sends a signal directly to the operating system process for that session.
It's possible that the session may have closed by the time pg_terminate_backend() is named. As PID numbers are assigned by the operating system, it could even happen that you try to terminate a given session (let's call it session A), but you actually terminate another session (let's call it session B).
Here is how it could happen. Suppose you take note of the PID of session A and decide to disconnect it. Before you actually issue pg_terminate_backend(), session A disconnects, and right after, a new session, session B, is given exactly the same PID. So, when you terminate that PID, you hit session B instead.
On the one ...
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