gitlab-org--gitlab-foss/doc/development/database_debugging.md

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 ".

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Available RAILS_ENV

• production (not sure if in GDK)
• development (this is your main GDK db)
• test (used for tests like rspec and spinach)

Nuke everything and start over

If you just want to delete everything and start over,

• bundle exec rake db:drop RAILS_ENV=development
• bundle exec rake db:setup RAILS_ENV=development

Migration wrangling

• 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 up or down
• 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

• \q: Quit/exit
• \dt: List all tables
• \d+ issues: List columns for issues table
• CREATE TABLE board_labels();: Create a table called board_labels
• SELECT * FROM schema_migrations WHERE version = '20170926203418';: Check if a migration was run
• DELETE FROM schema_migrations WHERE version = '20170926203418';: Manually remove a migration