how to set postgresql command timeout in rails

Question

I\'m using heroku and heroku postgresql. How do I set db command timeout so that I get an exception when a sql command takes longer than 10 seconds?

Answer 1

I don't know ruby, but in PostgreSQL you can simply run this:

SET statement_timeout = '10s'

and afterwards, all queries in this connection (session) will have strict limit on runtime.

You can also change it in postgresql.conf as global default, or even make it default in given database or for given user like:

ALTER DATABASE web SET statement_timeout = '10s';
ALTER USER bad_user SET statement_timeout = '10s';

Answer 2

Configure your database.yml like this, the key bit being the variables hash:

defaults: &default
  adapter: postgresql
  encoding: unicode
  pool: 5
  min_messages: warning
  variables:
    statement_timeout: 5000

Answer 3

Adding

ActiveRecord::Base.connection.execute('set statement_timeout to 10000')

to the end of the environment.rb file did not work for me.

What worked was adding

ActiveRecord::Base.connection.execute("SET statement_timeout = '10s'")

to an initialize file.

Answer 4

I found a solution here: Ruby on Rails: How to set a database timeout in application configuration?

Add

ActiveRecord::Base.connection.execute('set statement_timeout to 10000')

in the end of the environment.rb file.

Does anyone see a better way?