ActiveRecord で SQLite3 を利用していた場合に以下のエラーが発生しました。 Caught ActiveRecord::StatementInvalid: SQLite3::BusyException: database is locked: SQL /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/abstract_adapter.rb:150:in `log' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/sqlite_adapter.rb:132:in `execute' /usr/local/lib/