索引键列可以包括固定长度和可变长度列。

The key columns of an index can include fixed-length and variable-length columns.

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对BDB表，通常无论你用固定长度列或可变长度列没有太大差别。

For BDB tables, it usually doesn't make much difference whether you use fixed-length or variable-length columns.

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数值压缩不为空值、可变长度列中的零长度数据和系统默认值提供磁盘空间。

Enabling value compression allows for no disk storage to be consumed by NULL values, zero length data in variable length columns and system default values.

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具有可变长度的索引键列。

For an index key column that is of variable length.

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具有可变长度的索引键列。

For an index key column that is of variable length.

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