query_track

QueryTrack

Tool for finding time-consuming database queries for ActiveRecord-based Rails Apps. Provides Slack notifications with backtrace, raw SQL, time duration, etc.

Installation

Add this line to your application's Gemfile and then execute bundle install:

gem 'query_track'

Usage

SQL Duration Limit

Specify SQL duration query limit (in seconds):

QueryTrack::Settings.configure do |config|
  config.duration = 0.5
end

Console Log

Enable console logs from config:

QueryTrack::Settings.configure do |config|
  config.duration = 0.5
  config.logs = true
end

Filters

To avoid noisy warnings from used gems, and places where fat queries are justified, you can filters SQL by backtrace. For example, you have installed activeadmin and want to skip everything from app/admin:

QueryTrack::Settings.configure do |config|
  config.duration = 0.5
  config.filters = ['app/admin']
end

App Directory

QueryTrack finds the trace by filtering the caller by the app directory. By default, the app directory is set to 'app', the default for Rails apps. For apps that have a non-stanard app directory, this can be set with the app_dir config field:

QueryTrack::Settings.configure do |config|
  config.duration = 0.5
  config.app_dir = 'backend'
end

Enable/Disable toggle

Enable/disable with ENV variables to turn it on/off without code push. By default QueryTrack is enabled.

QueryTrack::Settings.configure do |config|
  config.duration = 0.5
  config.enabled = ENV['QUERY_TRACK_ENABLED']
end

Slack Notifications

To receive notifications about slow queries into Slack, you need to install incoming-webhooks and put link into config file:

QueryTrack::Settings.configure do |config|
  config.duration = 0.5
  config.notifications.slack = 'https://hooks.slack.com/services/T0000000/B0000000/C0000000'
end

Custom Notifications (Handlers)

You can write your own handler for slow queries. Send data to any source(for e.g. to logs storage) or make notification for another source(Email, Messengers, etc.)

QueryTrack::Settings.configure do |config|
  config.duration = 0.5
  config.notifications.custom_handler = -> (sql, duration, trace) {
    # data processing...
  }
end

Production Usage Notes

When QueryTrack send slack hooks, request is executed in separate thread. So there should be no synchronous delays.

Subscription to SQL events and checking duration time actually take insignificant time in milliseconds.

If your project is horizontally scaled, you can install query_track for one of the node to avoid performance degrade for whole application.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/kirillshevch/query_track.

License

The gem is available as open source under the terms of the MIT License.