In the integration server layer, design a query optimizer and research query rewrite, cost estimation model and caches mechanism.
在服务器层设计一个查询优化器，并研究了查询重写和代价估计优化方法以及缓存机制。
This has several implications for the design of a query language.
这对查询语言的设计具有多种含意。
It's pointed out that a major design element for performance is the query cache.
需要指出的是关于性能的主要设计要素是查询缓存。
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