每行包含一个给定帐户的信息，包括图像类型、已上传的图像数量、它们的平均评级和包含的所有图像的总大小(字节数)。
Each row contains the information for a given account including the genre of images, the number of images uploaded, their average ranking, and the total size of all of the images combined (in bytes).
经验法则是，为XML数据选择一个不小于平均预期文档大小的两倍而且不超过32 KB最大值的页宽。
As a rule of thumb, choose a page size for XML data which is not smaller than two times your average expected document size, subject to the maximum of 32kb.
由于每个事务都有一个基本的开销，如果报文的平均大小较小(例如10 KB)，那么事务持续时间不会显著减少。
As there is a base overhead per transaction, a smaller average message (10 KB, for instance) will not reduce the transaction duration significantly.
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