Disable Elixir Ecto Debug output

Question

Whatever in iex> or using mix run -e \"My.code\" when I run the mix project using ecto, the Ecto\'s Debugging Mechanism display a bunch of SQLs like

Answer 1

Ecto 3 answer to completely disabling logging would be:

config :app, App.Repo,
  username: "postgres",
  password: "postgres",
  database: "app_dev",
  log: false