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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class UsersNameLowerIndex < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
INDEX_NAME = 'index_on_users_name_lower'
disable_ddl_transaction!
def up
return unless Gitlab::Database.postgresql?
# On GitLab.com this produces an index with a size of roughly 60 MB.
execute "CREATE INDEX CONCURRENTLY #{INDEX_NAME} ON users (LOWER(name))"
end
def down
return unless Gitlab::Database.postgresql?
if supports_drop_index_concurrently?
execute "DROP INDEX CONCURRENTLY IF EXISTS #{INDEX_NAME}"
else
execute "DROP INDEX IF EXISTS #{INDEX_NAME}"
end
end
end
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