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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What if the backend won't terminate?
If pg_terminate_backend(pid) fails to kill the backend and you really need to reset the database state to make it continue processing requests, then you have yet another option: sending SIGKILL to the offending backend.
This can be done only from the command line as the root or the postgres system user, and on the same host the database is running, by executing the following code:
kill -9 <backend_pid>
This command kills that backend immediately, without giving it a chance to clean up. Consequently, the postmaster is forced to kill all the other backends as well and restart the whole cluster.
Therefore, it actually does not matter which of the PostgreSQL backends you kill.
You must be extremely careful ...
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