[postgresql] Postgresql - unable to drop database because of some auto connections to DB

In terminal try this command:

ps -ef | grep postgres

you will see like:

501 1445 3645 0 12:05AM 0:00.03 postgres: sasha dbname [local] idle

The third number (3645) is PID.

You can delete this

sudo kill -9 3645

And after that start your PostgreSQL connection.

Start manually:

pg_ctl -D /usr/local/var/postgres start