INCR key Available since: 1.0.0 Time complexity: O(1) ACL categories: @write, @string, @fast, Increments the number stored at key by one. If the key does not exist, it is set to 0 before performing the operation. An error is returned if the key contains a value of the wrong type or contains a string that can not be represented as integer. This operation is limited to 64 bit signed integers. Note: