尽管DB 2优化器对选择最佳访问路径有所帮助，但结果还是依赖于输入数据，优化器无法访问或控制这些数据。
Although the DB2 optimizer is helpful for selecting the best access path, the result depends on the input data, which is often not accessed or controlled by the optimizer.
选择结构化活动(也称为切换)根据条件控制流程采用的路径。
A choice structured activity (also known as a switch) controls which path the process takes, based on a condition.
一旦乘客选择好了目的地，控制系统会记录下要求，并向舱车发送一条信息，随后舱车会遵循一条电子传感路径前进。
Once the destination has been chosen, the control system logs the request and sends a message to the vehicle, which then follows an electronic pathway.
应用推荐