第一个问题是关于维护窗口的创建。
在维护窗口中，数据库实例会在特定时间段内被离线。
The database instance is taken offline for certain period of time within the maintenance window.
这个维护窗口可以被用来为应用软件打补丁和数据备份。
The maintenance window is used for application software patching, as well as data backups.
他们必须保证服务24x7可用，即使在每周的维护窗口运行的时候也一样。
They need to guarantee service availability 24x7, even during weekly maintenance windows.
若计划在一个生产环境内运行此例程，可以考虑在维护窗口期间或是当系统处于轻负载的情况下运行它。
If you are planning to run this routine in a production environment, consider running it during a maintenance window or when the system is under a light load.
若计划在一个生产环境内运行此例程，可以考虑在维护窗口期间或是当系统处于轻负载的情况下运行它。
If you are planning to run this routine in a production environment, consider running it during a maintenance window or when the system is under a light load.
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