two-step read 二步读出 ; 两步读出
In Step 9, after comparing the two snapshots, we identified the top SQL queries had growing rows read per execution, shown in red in Figure 6.
在步骤9中，比较了这两个快照之后，我们确定了每次执行读取行数增加的、最常用的SQL查询，如图6中的红色部分所示。
Step two: data is copied from the kernel buffer into the user buffer, and the read system call returns. The return from the call caused a context switch from kernel back to user mode.
步骤二：数据从内核空间缓冲区复制到用户空间缓冲区，之后系统调用read返回，这导致了从内核空间向用户空间的上下文切换。
Step two: data is copied from the kernel buffer into the user buffer, and the read system call returns.
所需的数据被从读取缓冲区拷贝到用户缓冲区，read() 调用返回。
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