它允许应用程序在后台对表执行恒定数据加载操作，同时可以执行交互式读取和写入操作。
It allows applications to perform constant data load operations to a table in the background while the interactive read and write operations can occur concurrently.
只要负荷大体上是恒定的，应用程序通常会很快达到一个稳定的内存使用水平。
So long as load is roughly constant, applications typically reach a steady state level of memory usage fairly quickly.
假设一个列恒定地包含一个值- 9999；这告诉使用该数据的程序，应该执行备选的处理。
Take the case where a column constantly contains a value of -9999; this indicates to programs that consume this data that alternate processing should be performed.
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