摘要： 本文系转载，如果有侵犯只是版权,请联系本人，本人将即刻停止侵权行为http://blog.csdn.net/CompassButton/article/details/3766703http://www.searchdatabase.com.cn/showcontent_17103.htm 阅读全文

摘要： 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.phpCBO-Cost-Based Optimizer 阅读全文