Database Debugging and Troubleshooting
This section is to help give some copy-pasta you can use as a reference when you run into some head-banging database problems.
An easy first step is to search for your error in Slack or google "GitLab ".
production(generally not for your main GDK db, but you may need this for e.g. omnibus)
development(this is your main GDK db)
test(used for tests like rspec)
Nuke everything and start over
If you just want to delete everything and start over with an empty DB (~1 minute):
bundle exec rake db:reset RAILS_ENV=development
If you just want to delete everything and start over with dummy data (~40 minutes). This also does
db:reset and runs DB-specific migrations:
bundle exec rake dev:setup RAILS_ENV=development
If your test DB is giving you problems, it is safe to nuke it because it doesn't contain important data:
bundle exec rake db:reset RAILS_ENV=test
bundle exec rake db:migrate RAILS_ENV=development: Execute any pending migrations that you may have picked up from a MR
bundle exec rake db:migrate:status RAILS_ENV=development: Check if all migrations are
bundle exec rake db:migrate:down VERSION=20170926203418 RAILS_ENV=development: Tear down a migration
bundle exec rake db:migrate:up VERSION=20170926203418 RAILS_ENV=development: Setup a migration
bundle exec rake db:migrate:redo VERSION=20170926203418 RAILS_ENV=development: Re-run a specific migration
Manually access the database
Access the database via one of these commands (they all get you to the same place)
gdk psql -d gitlabhq_development bundle exec rails dbconsole RAILS_ENV=development bundle exec rails db RAILS_ENV=development
\dt: List all tables
\d+ issues: List columns for
CREATE TABLE board_labels();: Create a table called
SELECT * FROM schema_migrations WHERE version = '20170926203418';: Check if a migration was run
DELETE FROM schema_migrations WHERE version = '20170926203418';: Manually remove a migration
ActiveRecord::PendingMigrationError with Spring
When running specs with the Spring preloader, the test database can get into a corrupted state. Trying to run the migration or dropping/resetting the test database has no effect.
$ bundle exec spring rspec some_spec.rb ... Failure/Error: ActiveRecord::Migration.maintain_test_schema! ActiveRecord::PendingMigrationError: Migrations are pending. To resolve this issue, run: bin/rake db:migrate RAILS_ENV=test # ~/.rvm/gems/ruby-2.3.3/gems/activerecord-4.2.10/lib/active_record/migration.rb:392:in `check_pending!' ... 0 examples, 0 failures, 1 error occurred outside of examples
To resolve, you can kill the spring server and app that lives between spec runs.
$ ps aux | grep spring eric 87304 1.3 2.9 3080836 482596 ?? Ss 10:12AM 4:08.36 spring app | gitlab | started 6 hours ago | test mode eric 37709 0.0 0.0 2518640 7524 s006 S Wed11AM 0:00.79 spring server | gitlab | started 29 hours ago $ kill 87304 $ kill 37709