However, indexes can either increase or decrease the performance of operations to add, change, and delete database records.

然而，索引要么增加要么减少了添加，变更，以及删除数据库记录的操作执行。

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Schema optimization concerns how to improve the performance of record-related operations.

方案优化涉及到了怎样改进与记录相关操作的性能。

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So far we discussed many different things to improve performance of spatial operations.

至此，我们讨论了很多提高空间操作性能的不同方面。

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It killed entire brands, Pontiac included, and axed high-performance cars like the G8, a full-size, V8-powered sedan very similar to the new Chevy SS. It even went so far as to completely disband its long-standing High Performance Vehicle Operations unit, which had developed such fast, gas-guzzling cars as the Cadillac CTS-V and Chevrolet Corvette ZR-1.

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Through this performance lens, government operations become a way to drive better results, not an end in and of itself.

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Still, it didn't change the rising defaults in GE's finance business, its dangerous reliance on commercial paper or the lackluster performance of its industrial operations.

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