这些更新服务器提供不同的发行版，可以把服务器的维护外包，包括当前的软件状态、更新和补丁。
These update servers are available for different distributions and offer the advantage of outsourcing the maintenance of the server, including the current software status, updates, and fixes.
正如前面提到的，DBA可以使用传感器收集服务器数据，从而维护关于服务器上活动的历史记录。
As mentioned earlier, sensors can be used by DBAs to accumulate server data in order to maintain a history of activities on the server.
服务器数量的减少和集群的实现允许在服务器上进行维护时，用户无需任何停机。
The reduction of servers and the implementation of clustering allowed maintenance to take place on the servers without requiring any downtime for the users.
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