固定长度的记录要优于可变长度的记录，因为 DB2 代码专门为处理固定长度的记录进行优化。

Fixed-length records are preferred over varying length records, because the DB2 code is optimized for processing fixed-length records.

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VARCHAR存储可变长度的单字节或多字节文本字符串(最高可达255个字节)；在整理文本数据时支持使用代码集顺序。

VARCHAR Stores single-byte or multibyte text strings of varying length (up to 255 bytes); supports code-set order collation of text data.

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