一块拼图是数据建模，另一块是数据库更改。

One puzzle piece is data modeling and another is database change.

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尽管缓存可能在一定程度上减轻这种性能影响，但如果使用特定大小的数据块检索数据来支持用户界面分页，则可能出现另一个问题。

Although caching might alleviate this to some degree, another problem might arise if data is retrieved in blocks of a certain size to support user interface pagination.

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CDATA(字符数据)区域被解析器视为数据块，从而允许您在数据流中包含任意字符。

CDATA (character data) sections are treated as a block of data by the parser, allowing you to include any character in the data stream.

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