Common DB rake commands

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db:create Creates the database for the current RAILS_ENV environment. If RAILS_ENV is not specified it defaults to the development and test databases.
db:create:all Creates the database for all environments.

db:drop Drops the database for the current RAILS_ENV environment. If RAILS_ENV is not specified it defaults to the development and test databases.
db:drop:all Drops the database for all environments.

db:migrate Runs migrations for the current environment that have not run yet. By default it will run migrations only in the development environment.
db:migrate:redo Runs db:migrate:down and db:migrate:up or db:migrate:rollback and db:migrate:migrate depending on the specified migration. I usually run this after creating and running a new migration to ensure the migration is reversable.
db:migrate:up Runs the up for the given migration VERSION.
db:migrate:down Runs the down for the given migration VERSION.
db:migrate:status Displays the current migration status.
db:migrate:rollback Rolls back the last migration.

db:version Prints the current schema version.
db:forward Pushes the schema to the next version.
db:seed Runs the db/seeds.rb file.

db:schema:load Loads the schema into the current environment’s database.
db:schema:dump Dumps the current environment’s schema to db/schema.rb.

db:setup Runs db:schema:load and db:seed.
db:reset Runs db:drop and db:setup.
db:migrate:reset Runs db:drop, db:create and db:migrate.

db:test:prepare Check for pending migrations and load the test schema. (If you run rake without any arguments it will do this by default.)
db:test:clone Recreate the test database from the current environment’s database schema.
db:test:clone_structure Similar to db:test:clone, but it will ensure that your test database has the same structure, including charsets and collations, as your current environment’s database.