With the step-by-step analysis on statistics, predicate, and index, the performance of the problem query is improved significantly.

通过对统计数据、谓词和索引的逐步分析，问题查询的性能大幅提升。

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Add comments to the index to indicate why it was created, for example, to help the performance of transaction XYZ.

添加关于索引的注释，指示创建的原因，例如，用于帮助提高事务xyz的性能。

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In fact, the use of an index for sort avoidance is a key way to improve the performance of SQL that qualifies far more rows than will actually ever be FETCHed.

事实上，使用一个索引来避免排序的一个关键方法是提高SQL性能，使其比应用FETCH实际获取的行更多。

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Those willing to take the extra risk of individual stocks in an effort to beat the performance of the underlying index, might want to consider using a leveraged etf on the index instead.

FORBES: Small Cap Stocks And ETF To Milk The January Effect

Shares of the Philadelphia semiconductor index, which tracks the stock performance of a handful of semiconductor companies, was down by 7.6% at the close of Monday's trading session.

FORBES: Magazine Article

If you invest in single asset class index funds like the Vanguard Total US Stock Market index or the Spartan International Index at Fidelity, you can easily compare the performance of your individual holdings to the market index they track.

FORBES: How Did Your Portfolio Perform In 2010?