docker exec -it -u postgres example-db psql; # login interactively

SELECT * FROM pg_stat_activity WHERE datname = 'example';

# check open connections to database example
# (there shall be none, otherwise you can not drop the database)
SELECT pg_terminate_backend ( FROM pg_stat_activity WHERE pg_stat_activity.datname = 'example';

ERROR: cannot drop the currently open database

-> try to restart database, disconnect all clients

then issue:

psql -U postgres -c "drop database example"

and pray that it works

now if you want to import a database dump you can recreate the database like this:

docker exec -it -u postgres example-db psql; # login interactively


# disconnect

# import backup
docker exec -i -u postgres example-db psql --user example example < /backups/2018-02-02-example-dump.sql

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