Tuning can include adding extra indexes to yield a more efficient access plan, which makes tables volatile to encourage index usage and avoid table scans if possible.

调优包括添加额外索引来生成一个更高效的访问计划，让表格变幻无常，进而鼓励索引的使用，如果可能的话也可以避免表扫描。

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The yield gap between conventional and index-linked Treasuries, a measure of inflation expectations, has risen by more than 0.3 percentage points this year.

作为通胀预期的指标，传统国库券和与物价指数挂钩的国库券之间的经济收益差额，今年已经上升超过了0.3%。

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A field study was conducted to determine the relationships between Crop Water Stress Index (CWSI), yield, and quality of cotton under drip irrigation with mulch.

通过田间试验，研究了膜下滴灌棉花的作物产量、品质和作物缺水指标(CWSI)定量关系。

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The yield on a closely watched index of 30-year triple-A rated, tax-exempt municipal securities climbed 0.12 percentage point higher to close at 4.48% Tuesday, according to Municipal Market Data.

WSJ: Tax-Cut Deal Results in Turmoil for Bonds

In that light, a negative yield of 0.55% on index-linked bonds seems a good investment.

ECONOMIST: A very unusual sign of confidence in economic policy

The underlying Alerian Natural Gas MLP Index has a current yield of 6.56%.

FORBES: MLPs: A Trendy Choice