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2009
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August
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博客系统上线咯
08/06/09
网站内容已经很久没有更新了。现在太忙了，很难有时间写一些比较系统的文章了。
实际上，日常工作中其实还是有不少典型案例、有价值的新发现、新经验。这些东西如果没有记录下来，最终还是成为记忆的经历。 -
Full Table Scan cost formula cracking
08/01/09
CBO is a relatively more accurate optimizer, it will choose the access path considering more objective factors, to draw a more reasonable execution plan. However, Oracle does not give us complete formula for calculating the cost, so we do not know the impact of these factors in the costs calculation
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博客系统上线咯
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