PostgreSQL: Temporarily disable connections

After you have terminated the current active connections you can also issue this command that will only allow super users to login. This assumes you are ok with all super users having access still. Hopefully you don't hand out super user rights to just anyone.

ALTER DATABASE your_db CONNECTION LIMIT 0;

To mark database 'applogs' as not accepting new connections:

update pg_database set datallowconn = false where datname = 'applogs';

Another possibility would be to revoke 'connect' access on the database for the client role(s).

Disconnect users from database = kill backend. So to disconnect all other users from "applogs" database, for example:

select pg_terminate_backend(procpid)
from pg_stat_activity
where datname = 'applogs' and procpid <> pg_backend_pid();

Once you've done both of those, you are the only user connected to 'applogs'. Although there might actually be a delay before the backends actually finish disconnecting?