For instance, you may manually send an update of some sort via secure transfer only on an as-needed basis.
例如，可能只在需要时手工地通过安全的传输通道发送某些东西的更新。
Polling activities, which control the execution of one or more data management activities based on some sort of trigger or event such as an update to data in an external RDBMS.
Polling活动，基于某种触发器或事件，比如更新外部RDBMS中的数据，来控制一个或多个数据管理活动的执行。
In this paper, this algorithm was based on the data update rate and it increased the size of the selected data to determine and sort, then made the choice of the prefetching data.
在此算法的基础上增加对数据更新率及大小的判断并对所选数据排序，然后进行预取数据的选择。
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