55 lines
2.1 KiB
Markdown
55 lines
2.1 KiB
Markdown
# Database Debugging and Troubleshooting
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This section is to help give some copy-pasta you can use as a reference when you
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run into some head-banging database problems.
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An easy first step is to search for your error in Slack or google "GitLab <my error>".
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---
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Available `RAILS_ENV`
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- `production` (generally not for your main GDK db, but you may need this for e.g. omnibus)
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- `development` (this is your main GDK db)
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- `test` (used for tests like rspec and spinach)
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## Nuke everything and start over
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If you just want to delete everything and start over with an empty DB (~1 minute):
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- `bundle exec rake db:reset RAILS_ENV=development`
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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:
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- `bundle exec rake dev:setup RAILS_ENV=development`
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If your test DB is giving you problems, it is safe to nuke it because it doesn't contain important data:
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- `bundle exec rake db:reset RAILS_ENV=test`
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## Migration wrangling
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- `bundle exec rake db:migrate RAILS_ENV=development`: Execute any pending migrations that you may have picked up from a MR
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- `bundle exec rake db:migrate:status RAILS_ENV=development`: Check if all migrations are `up` or `down`
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- `bundle exec rake db:migrate:down VERSION=20170926203418 RAILS_ENV=development`: Tear down a migration
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- `bundle exec rake db:migrate:up VERSION=20170926203418 RAILS_ENV=development`: Setup a migration
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- `bundle exec rake db:migrate:redo VERSION=20170926203418 RAILS_ENV=development`: Re-run a specific migration
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## Manually access the database
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Access the database via one of these commands (they all get you to the same place)
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```
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gdk psql -d gitlabhq_development
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bundle exec rails dbconsole RAILS_ENV=development
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bundle exec rails db RAILS_ENV=development
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```
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- `\q`: Quit/exit
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- `\dt`: List all tables
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- `\d+ issues`: List columns for `issues` table
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- `CREATE TABLE board_labels();`: Create a table called `board_labels`
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- `SELECT * FROM schema_migrations WHERE version = '20170926203418';`: Check if a migration was run
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- `DELETE FROM schema_migrations WHERE version = '20170926203418';`: Manually remove a migration
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