The most important reason to use more than one user table space is to manage buffer utilization.
使用多个用户表空间的最重要原因是管理缓冲区的利用率。
Use of the intermediate kernel buffer (rather than a direct transfer of the data into the user buffer) might seem inefficient.
使用中间内核缓冲区(而不是直接将数据传输到用户缓冲区)看起来可能有点效率低下。
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