November 2015
Beginner
464 pages
9h 46m
English
Content preview from Learning PostgreSQLBecome 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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Terminating and canceling user sessions
Database administrators often need to kill server processes for various reasons. For example, in certain scenarios, very slow queries running on the slave or master, which are configured using streaming replication, can break the replication.
Getting ready
It is important to terminate some database connections and processes in the case of dead locks, in case the maximum number of connections is exceeded, as well as for maintenance purposes, such as dropping the database as one cannot drop the database if someone is connected to it.
How to do it…
PostgreSQL provides the pg_terminate_backend(pid) and pg_cancel_backend(pid) functions, while pg_cancel_backend only cancels the current query and pg_terminate_backend ...
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