105 lines
4 KiB
Markdown
105 lines
4 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 search for `GitLab <my error>` with Google.
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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)
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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`: Set up 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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## FAQ
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### `ActiveRecord::PendingMigrationError` with Spring
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When running specs with the [Spring preloader](rake_tasks.md#speed-up-tests-rake-tasks-and-migrations),
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the test database can get into a corrupted state. Trying to run the migration or
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dropping/resetting the test database has no effect.
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```sh
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$ bundle exec spring rspec some_spec.rb
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...
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Failure/Error: ActiveRecord::Migration.maintain_test_schema!
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ActiveRecord::PendingMigrationError:
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Migrations are pending. To resolve this issue, run:
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bin/rake db:migrate RAILS_ENV=test
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# ~/.rvm/gems/ruby-2.3.3/gems/activerecord-4.2.10/lib/active_record/migration.rb:392:in `check_pending!'
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...
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0 examples, 0 failures, 1 error occurred outside of examples
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```
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To resolve, you can kill the spring server and app that lives between spec runs.
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```sh
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$ ps aux | grep spring
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eric 87304 1.3 2.9 3080836 482596 ?? Ss 10:12AM 4:08.36 spring app | gitlab | started 6 hours ago | test mode
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eric 37709 0.0 0.0 2518640 7524 s006 S Wed11AM 0:00.79 spring server | gitlab | started 29 hours ago
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$ kill 87304
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$ kill 37709
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```
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### db:migrate `database version is too old to be migrated` error
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Users receive this error when `db:migrate` detects that the current schema version
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is older than the `MIN_SCHEMA_VERSION` defined in the `Gitlab::Database` library
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module.
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Over time we cleanup/combine old migrations in the codebase, so it is not always
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possible to migrate GitLab from every previous version.
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In some cases you may want to bypass this check. For example, if you were on a version
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of GitLab schema later than the `MIN_SCHEMA_VERSION`, and then rolled back the
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to an older migration, from before. In this case, in order to migrate forward again,
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you should set the `SKIP_SCHEMA_VERSION_CHECK` environment variable.
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```sh
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bundle exec rake db:migrate SKIP_SCHEMA_VERSION_CHECK=true
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```
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