为达到效率最大化，频繁访问的表区段应当越少越好。

For maximum efficiency, frequently accessed tables should have as few extents as possible.

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但从用户这方面来看，我们知道该表将会很快具有数百万的用户，如果在经常搜索的列上没有索引，该表的效率会很低。

But in the case of users, we know that the table will quickly grow into the millions of users, and will be ineffective without an index on frequently searched columns.

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尽管利息支付可以扣税，而红利不可以，举债可以使资产负债表更有效率。

Since interest payments are tax deductible, but dividends are not, some borrowing makes a balance-sheet more efficient.

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