优化的第一步称为预优化(pre-optimization)，如果查询语句很简单，最有效的执行计划显而易见，查询优化器将直接在这一步结束优化，得到优化结果，从而避免了更多的资源消耗...
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In the pre-optimization, not only the number of equipment operation at one point of time but also the number of operations during a whole day can be calculated.
在预优化中，可以同时算出每个时间点的动作设备数以及全天的动作总数。
参考来源 - 地区电网无功电压优化控制系统的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
这允许我们用JVM可能还没发现到的方式来预优化Ruby代码。
This will allow us to pre-optimize Ruby code in ways that the JVM might not figure out.
DB2 pureScale Feature 能根据一个最佳实践的预优化配置自动地部署和配置这些技术。
The DB2 pureScale Feature automatically deploys and configures these technologies according to a best-practice, pre-defined configuration.
更加优秀预取路径：我们设计了预取路径引擎(提前加载)更加智能以至于能通过更多的方法来优化它创建的查询。
Even Better prefetch Paths: We made the prefetch path engine (eager loading) even smarter so it now knows more ways to optimize the queries it has to create.
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