The cost for storage and maintenance of a functional index can be high.
函数索引的存储和维护成本较高。
In the economic point of view, the maintenance methods not only satisfy the minimum cost but also satisfy the minimum safe index.
从经济的观点要求维护方法的费用最小，同时还应满足最小的安全指标。
In the economic point of view, the maintenance methods not only satisfy the minimum cost but also satisfy the minimum safe index.
从经济的观点要求维护方法的费用最小，同时还应满足最小的安全指标。
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