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http://www.webpronews.com/936-million-users-get-on-facebook-at-least-once-a-day-2015-04 https://code.facebook.com/posts/229861827208629/scaling-the-facebook-data-warehouse-to-300-pb/ https://research.facebook.com/blog/1522692927972019/facebook-s-top-open-data-problems/

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> set mykey hello OK > exists mykey (integer) 1 > del mykey (integer) 1 > exists mykey (integer) 0 > set key some-value OK > expire key 5 (integer) 1 > get key (immediately) "some-value" > get key (after some time) (nil) > DEL list1 list2 (integer) 0 > RPUSH list1 a b c (integer) 3 > BRPOP list1 list2 0 1) "list1" 2) "c" http://blog.serverdensity.com/wp-content/uploads/2011/04/redis-300dpi.png?w=150

> MULTI OK > INCR foo QUEUED > INCR bar QUEUED > EXEC 1) (integer) 1 2) (integer) 1 http://blog.serverdensity.com/wp-content/uploads/2011/04/redis-300dpi.png?w=150

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