rw参数，使用它指明预抓取数据是为了执行读操作，还是执行写操作。

The rw parameter, which you use to indicate whether the data is being pulled in for Read or preparing for a Write operation.

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每个成员可以同时访问相同的数据库，包括读和写操作。

Each member can simultaneously access the same database for both read and write operations.

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但是，假若我们想全部利用IOCP服务器的潜力，我们应该有很多的异步读操作等待数据的到达。

But if we want to use the IOCP server's full potential, we should have several pending asynchronous reads waiting for data to arrive.

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