すこやかRails2014-11-01 渋谷Ruby会議01 http://regional.rubykaigi.org/shibuya01/Read less
MySQL InnoDB Primary Key Choice: GUID/UUID vs Integer Insert Performance :: KCCoder
MySQL InnoDB Primary Key Choice: GUID/UUID vs Integer Insert Performance When working with MySQL it is common to choose auto incrementing integer primary keys; however, there are situations where using a GUID/UUID is desirable. For example, prior to MySQL 5.0, you were unable to safely use auto incrementing primary keys in a multi-master replicated setup due to potential (and inevitable) duplicate
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