in the old days, with asp.net, when i would navigate to a non existing page, the .net framework (or iis?) would throw a 404 and i could attach a default page to that error in the web.config in the cus
膨胀率的精开发者_oracle确计算 PostgreSQL自带了pgstattuple模块，可用于精确计算表的膨胀率。譬如这里的tuple_percent字http://www.devze.com段就是元组实际字节占关系总大小的百分比，用1减去该值即为膨胀率。
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