当产品的市场成熟，自己与竞争对手的市场份额比例也相对固定时，公司就进入了维护期。
When product market space matures and the market share between competitors becomes fixed, the company enters the maintain stage.
数据仓库和业务智能化环境的一项常见需求是，维护特定时间段内滚动变化的历史数据。
A frequent requirement for data warehouses and business intelligence environments involves maintaining a rolling history of select data over a given period of time.
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.
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