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

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# 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 <my error>".
---
Available `RAILS_ENV`
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- `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 and spinach)
## 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`
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`
## 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