Active Record Tracer Save

A tracer for Active Record queries

Project README


A tracer for Active Record queries

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You identified (or suspect) that the reason for the slowness of some code is Active Record, specifically lots of queries and/or loaded records. How do you easily detect which queries, which records are loaded the most, and the sources of those? This tool to the rescue!


  • ruby 3.1+
  • activerecord 7.0+


Add this line to your application's Gemfile:

gem "active_record_tracer", group: [:development, :test]

And then execute:

$ bundle

Or install it yourself as:

$ gem install active_record_tracer


require "active_record_tracer"
report = do
  # run your code here


Or, you can use the .start/.stop API as well:

require "active_record_tracer"


# run your code

report = ActiveRecordTracer.stop

NOTE: .start/.stop can only be run once per report, and .stop will be the only time you can retrieve the report using this API.

Tracing tests

To trace tests, use the folloding somewhere in the rails_helper.rb/test_helper.rb:

at_exit do
  report = ActiveRecordTracer.stop
  report.pretty_print(to_file: "tmp/active_record_tracer-tests.txt")



The report method can take a few options:

  • top: maximum number of entries to display in a report (default is 50)
  • backtrace_lines: maximum number of backtrace lines to include in the report (default is 5)
  • ignore_cached_queries: whether to ignore cached queries (default is false)
  • ignore_schema_queries: whether to ignore schema queries (default is true)

Check out Reporter#new for more details.


The pretty_print method can take a few options:

  • to_file: a path to your log file - can be given a String
  • detailed_report: whether to include detailed information - can be given a Boolean

Check out Report#pretty_print for more details.

Example output

Total runtime: 181.36s
Total SQL queries: 8936
Total loaded records: 2648

Top SQL queries
     857  SAVEPOINT active_record_1

     856  RELEASE SAVEPOINT active_record_1

     382  SELECT "user_roles".* FROM "user_roles" WHERE "user_roles"."id" = $1 LIMIT $2

     362  SELECT "accounts".* FROM "accounts" WHERE "accounts"."id" = $1 LIMIT $2

     301  INSERT INTO "accounts" ("username", "domain", "private_key") VALUES ($1, $2, $3) RETURNING "id"

     219  SELECT "settings".* FROM "settings" WHERE "settings"."thing_type" IS NULL AND "settings"."thing_id" IS NULL AND "settings"."var" = $1 LIMIT $2

     217  INSERT INTO "conversations" ("uri", "created_at", "updated_at") VALUES ($1, $2, $3) RETURNING "id"

     201  SELECT "statuses".* FROM "statuses" WHERE "statuses"."deleted_at" IS NULL AND "statuses"."id" = $1 ORDER BY "statuses"."id" DESC LIMIT $2

     175  BEGIN

     174  ROLLBACK

     169  SELECT "account_stats".* = $1 LIMIT $2

     158  SELECT 1 AS one FROM "instances" WHERE "instances"."domain" = $1 LIMIT $2

     155  SELECT 1 AS one FROM "users" WHERE "users"."email" = $1 LIMIT $2

     152  SELECT "domain_blocks".* FROM "domain_blocks" WHERE "domain_blocks"."domain" IN ($1, $2) ORDER BY CHAR_LENGTH(domain) DESC LIMIT $3

SQL queries by location
     586  app/validators/unique_username_validator.rb:12
     391  app/models/user_role.rb:112
     314  app/models/concerns/account/counters.rb:54
     253  app/models/concerns/account/interactions.rb:116
     217  app/models/setting.rb:80
     215  app/models/concerns/status/safe_reblog_insert.rb:19
     168  app/models/concerns/account/counters.rb:48
     165  app/models/domain_block.rb:73
     158  app/models/concerns/domain_materializable.rb:13
     140  app/models/email_domain_block.rb:61
     137  app/models/concerns/database_view_record.rb:8
     123  app/lib/activitypub/activity/create.rb:86
     122  app/lib/activitypub/tag_manager.rb:185
     120  app/models/status.rb:400
     110  app/models/account.rb:375
      98  app/models/concerns/account/finder_concern.rb:32
      98  app/models/concerns/account/finder_concern.rb:16
      87  app/models/status.rb:377
      78  app/models/status.rb:289
      74  app/models/account.rb:150
      68  app/models/follow_request.rb:38
      64  app/services/activitypub/fetch_featured_collection_service.rb:76
      63  app/services/activitypub/process_status_update_service.rb:163
      63  app/models/account.rb:265
      62  app/models/status.rb:371

SQL queries by file
     586  app/validators/unique_username_validator.rb
     563  app/models/concerns/account/counters.rb
     495  app/models/status.rb
     392  app/models/user_role.rb
     376  app/models/concerns/account/interactions.rb
     340  app/models/account.rb
     337  app/services/activitypub/process_status_update_service.rb
     241  app/models/setting.rb
     217  app/models/concerns/status/safe_reblog_insert.rb
     213  app/lib/activitypub/activity/create.rb
     196  app/models/concerns/account/finder_concern.rb
     166  app/services/fan_out_on_write_service.rb
     165  app/models/domain_block.rb
     158  app/models/concerns/domain_materializable.rb
     155  app/models/email_domain_block.rb
     137  app/models/concerns/database_view_record.rb
     134  app/lib/activitypub/tag_manager.rb
     107  app/models/follow_request.rb
     106  app/lib/feed_manager.rb

SQL queries by backtrace
     539  app/validators/unique_username_validator.rb:12:in `validate'

     306  app/models/user_role.rb:112:in `everyone'
          app/models/user.rb:160:in `role'
          app/models/user.rb:486:in `sanitize_role'

     168  app/models/concerns/account/interactions.rb:116:in `follow!'

     140  app/models/email_domain_block.rb:61:in `blocking?'
          app/models/email_domain_block.rb:49:in `match?'
          app/models/email_domain_block.rb:94:in `requires_approval?'
          app/models/user.rb:470:in `sign_up_email_requires_approval?'
          app/models/user.rb:416:in `set_approved'

     137  app/models/concerns/domain_materializable.rb:13:in `refresh_instances_view'

     124  app/models/concerns/account/counters.rb:54:in `updated_account_stat'
          app/models/concerns/account/counters.rb:38:in `update_count!'
          app/models/concerns/account/counters.rb:24:in `increment_count!'
          app/models/status.rb:455:in `increment_counter_caches'

Loaded records by model
     533  Account
     390  UserRole
     287  Status
     101  AccountStat
      70  Setting
      64  User
      29  Follow
      24  AccountDeletionRequest
      21  MediaAttachment
      20  Conversation
      17  FollowRequest
      17  Tag

Loaded records by location
     381  app/models/user_role.rb:112
      98  app/models/concerns/account/finder_concern.rb:16
      65  app/models/concerns/account/finder_concern.rb:32
      64  app/models/setting.rb:80
      61  app/models/concerns/account/counters.rb:48
      53  app/lib/activitypub/tag_manager.rb:185
      46  app/models/concerns/rate_limitable.rb:23
      45  app/workers/distribution_worker.rb:10
      45  app/services/fan_out_on_write_service.rb:14

Loaded records by file
     385  app/models/user_role.rb
     163  app/models/concerns/account/finder_concern.rb
      97  app/models/concerns/account/counters.rb
      70  app/models/setting.rb
      68  app/models/account.rb
      57  app/services/fan_out_on_write_service.rb
      53  app/lib/activitypub/tag_manager.rb

Loaded records by backtrace
     298  app/models/user_role.rb:112:in `everyone'
          app/models/user.rb:160:in `role'
          app/models/user.rb:486:in `sanitize_role'

      61  app/models/setting.rb:80:in `block in []'
          app/models/setting.rb:79:in `[]'
          app/models/setting.rb:65:in `method_missing'
          app/models/user.rb:474:in `open_registrations?'
          app/models/user.rb:419:in `set_approved'

      45  app/services/fan_out_on_write_service.rb:14:in `call'
          app/workers/distribution_worker.rb:10:in `block in perform'
          app/models/concerns/lockable.rb:12:in `block (2 levels) in with_redis_lock'
          app/models/concerns/lockable.rb:10:in `block in with_redis_lock'
          app/lib/redis_configuration.rb:10:in `with'


After checking out the repo, run bundle install to install dependencies. Then, run bundle exec rake test to run the tests. This project uses multiple Gemfiles to test against multiple versions of Active Record; you can run the tests against the specific version with BUNDLE_GEMFILE=gemfiles/activerecord_70.gemfile bundle exec rake test.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at


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

Open Source Agenda is not affiliated with "Active Record Tracer" Project. README Source: fatkodima/active_record_tracer
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