A highly duplicated index can severely impact the speed of accessing, updating and deleting data.

一个高度重复的索引可能会严重影响访问、更新和删除数据的速度。

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Impact of schema evolution on the index lists.

模式演化对索引列表的影响。

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Of course, if you already have a lot of indexes on the EMP table, you might want to examine the impact of creating yet another index on the table. Factors to consider include

当然，如果您已经有许多关于 EMP 表的索引，您也许应该检查再创建另一个关于表的索引所带来的影响。

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At least as important as the human development index is the impact of all this on climate change.

BBC: Burning issues for the world's future

On Sunday, a statement issued by the Frankfurt-based lender called the latest charges "regrettable" and said it "sincerely regrets the impact on the Kospi market of an index arbitrage position unwind involving a small number of Deutsche Bank Group employees".

BBC: Deutsche Bank charged in South Korea over stock rout

For Facebook, the impact of joining any index may be more muted than is typical.

WSJ: Facebook Waits for Index 'Like'