pl/sql functions and cbo costing
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
I believe that we are who we choose to be. Nobody‘s going to come and save you, you‘ve got to save yourself.
我相信我们成为怎样的人是我们自己的选择。没有人会来拯救你，你必须要自己拯救自己。
