由于缺乏系统维护升级，绝大部分功能已经无法使用。
Due to lack of system maintenance upgrades, most functions are not available.
模式的关系数据库用于开发客户端办公自动化软件； B/S模式用于系统维护升级。
The relational database in C/S is applied to develop OA software of client-side, and B/S is used for maintenance and upgrading of the system.
使用本文中略述的方法，可以显著减少有计划的和无计划的停歇，从而无需中断操作就可以完成集群的升级和系统维护。
Using the approach outlined in this series, you can significantly reduce planned and unplanned outages, allowing for cluster upgrades and system maintenance without interrupting operations.
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