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diff --git a/doc/development/database_debugging.md b/doc/development/database_debugging.md new file mode 100644 index 00000000000..50eb8005b44 --- /dev/null +++ b/doc/development/database_debugging.md @@ -0,0 +1,55 @@ +# 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` + + - `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 + +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` + +## 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 |