Tuning the number of servers to start and keep spare depends on the role of the server.

根据服务器的角色调优要启动和保持空闲的服务器数量。

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You will note that without any tuning, the number of completed transactions improves from one run to another, but eventually it reaches a limit.

您将注意到在没有任何调优时，所完成事务的数目将随着一次运行到另一次提高，但最终会达到一个极限。

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Such statements may benefit from additional tuning to reduce the number of sorts, such as adding an index.

这些语句可受益于减少排序数目的附加调优，例如添加索引。

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Meanwhile, a growing cast of shows on cable networks are siphoning away a bigger share of the shrinking number who are tuning in overall.

WSJ: No Longer 'Must-See TV'

But Facebook argues that for brand advertisers, fine-tuning the number of times a particular consumer sees an ad as well as ensuring that the ad has reached all of its target audience are far more effective techniques.

FORBES: Facebook: Ad Clicks Show We're Bad Value So Let's Measure Advertising On Facebook Another Way