如果需要同步数据库，那么需要在这一阶段要有所计划。
If you require the databases to be synchronized then you must plan for this process.
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.
但在这一阶段，逐渐有国内科研人员开始进行数据库加密技术的研究。
But at this stage, the domestic researchers began to study the database encryption technology.
但在这一阶段，逐渐有国内科研人员开始进行数据库加密技术的研究。
But at this stage, the domestic researchers began to study the database encryption technology.
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