The content below come from http://try.redis.io/?
There is something special about?INCR. Why do we provide such an operation if we can do it ourself with a bit of code? After all it is as simple as:
x = GET count
x = x + 1
SET count x
The problem is that doing the increment in this way will only work as long as there is a single client using the key. See what happens if two clients are accessing this key at the same time:
Client A reads?count?as 10.
Client B reads?count?as 10.
Client A increments 10 and sets?count?to 11.
Client B increments 10 and sets?count?to 11.
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