参考网址:http://blog.csdn.net/suncrafted/article/details/4239237

　　       http://www.oracle-base.com/articles/misc/cost-based-optimizer-and-database-statistics.php

CBO-Cost-Based Optimizer

转载于:https://www.cnblogs.com/caroline/archive/2012/06/03/2532998.html

原文链接：https://blog.csdn.net/weixin_30342827/article/details/96305189

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