mysql replace into和 insert into ... on duplicate update 区别
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参考了两篇文章，还是没有明白，问什么replace into 避免可seek 磁盘
http://blog.csdn.net/mchdba/article/details/8647560
http://www.tokutek.com/2010/06/making-replace-into-fast-by-avoiding-disk-seeks/
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