At times you might want to see what all queries had hit your database, specially while testing and analyzing a solution. Similar need occurred recently in a project using postgres database. One can simply set log_statement flag to ‘all’ in postgresql.conf

postgres@server:/etc/postgresql/9.5/main$ vi postgresql.conf

Look for

log_statement = ‘all’ # none, ddl, mod, all

You can also set log_destination in the same file. By default logs will be at

postgres@server:/var/log/postgresql$ ls

And finally restart postgres server

/etc/init.d/postgresql restart

Please note enable logs on production server is not recommended in normal scenarios as they consume a lot of space.