A few years ago Peter Zaitsev, in a post titled To UUID or not to UUID, wrote: There is timestamp based part in UUID which has similar properties to auto_increment and which could be used to have values generated at same point in time physically local in BTREE index. For this post Ive rearranged the timestamp part [&]

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http://www.percona.com/blog/2014/12/19/store-uuid-optimized-way/