Kill a postgresql session/connection

Question

How can I kill all my postgresql connections?

I\'m trying a rake db:drop but I get:

ERROR:  database \"database_name\" is being accessed         


        

Answer 1

Quit postgres and restart it. Simple, but works every time for me, where other cli commands sometimes don't.

Answer 2

With all infos about the running process:

SELECT *, pg_terminate_backend(pid)
FROM pg_stat_activity 
WHERE pid <> pg_backend_pid()
AND datname = 'my_database_name';

Answer 3

I had this issue and the problem was that Navicat was connected to my local Postgres db. Once I disconnected Navicat the problem disappeared.

EDIT:

Also, as an absolute last resort you can back up your data then run this command:

sudo kill -15 `ps -u postgres -o pid`

... which will kill everything that the postgres user is accessing. Avoid doing this on a production machine but you shouldn't have a problem with a development environment. It is vital that you ensure every postgres process has really terminated before attempting to restart PostgreSQL after this.

EDIT 2:

Due to this unix.SE post I've changed from kill -9 to kill -15.

Answer 4

OSX, Postgres 9.2 (installed with homebrew)

$ launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
$ pg_ctl restart -D /usr/local/var/postgres
$ launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

If your datadir is elsewhere you can find out where it is by examining the output of ps aux | grep postgres

Answer 5

SELECT 
pg_terminate_backend(pid) 
FROM 
pg_stat_activity 
WHERE
pid <> pg_backend_pid()
-- no need to kill connections to other databases
AND datname = current_database();
-- use current_database by opening right query tool

Answer 6

I'VE SOLVED THIS WAY:

In my Windows8 64 bit, just restarting the service: postgresql-x64-9.5