    # File lib/active_record/connection_adapters/oracle_adapter.rb, line 616
        def initialize(config, factory = OracleConnectionFactory.new)
          @active = true
          @username, @password, @database, = config[:username], config[:password], config[:database]
          @async = config[:allow_concurrency]
          @prefetch_rows = config[:prefetch_rows] || 100
          @cursor_sharing = config[:cursor_sharing] || 'similar'
          @factory = factory
          @connection  = @factory.new_connection @username, @password, @database, @async, @prefetch_rows, @cursor_sharing
          super @connection
        end