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Ahmad Ya'kob Ubaidullah
Ahmad Ya'kob Ubaidullah

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Tracking long queries into csv

If you have tons of queries executed in a Job or in a method, and you want to monitor which queries are slow and need attention, how do you track them ?

I was wondering what really dragging my cache job running time. The job supposed to be done in under 4 minutes suddenly spiked to 22 minutes.

I found query_tracker gem which displays all the info I needed. It also allows slack integration. In my case, I wanted it to store query informations into CSV. Fortunately the gem allows custom handlers.

Below is how I did my custom handlers :

QueryTrack::Settings.configure do |config|
  config.duration = 0.5
  config.notifications.custom_handler = -> (sql, duration, trace) {"log/query_tracker.csv", "a+") do |csv|
      csv << [, duration, sql, trace]
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notice the a+ open type, that will prepend the file.

Now all the queries information are visible for your next action :
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You can always use the sort function to get more insights :
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In my case, this is my queries that needs attention :
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Thank you :)

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