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INCRBY

Increments the integer value of a key by the specified increment.

Syntax​

INCRBY key increment

Parameters​

  • key: The name of the key whose value you want to increment.
  • increment: The integer value by which the key's value should be increased.

Details​

  • Available since: 1.0.0
  • Time complexity: O(1)
  • ACL categories: @write, @string, @fast

The INCRBY command increases the integer value stored at key by the specified increment. If the key does not exist, it is set to 0 before performing the increment operation. The operation is atomic, ensuring that concurrent requests are correctly handled.

Examples​

Basic Usage​

Assume we have a key called mykey with the value "10":

SET mykey "10"

To increment the value of mykey by 5:

INCRBY mykey 5

This will return:

(integer) 15

The value of mykey will now be "15".

Handling a Non-Existent Key​

If the key does not exist:

INCRBY newkey 3

This will return:

(integer) 3

The key newkey is now set to "3".

Edge Cases​

  • If the key holds a value that is not an integer or cannot be represented as an integer, an error is returned.
  • If the resulting value after the increment operation exceeds the maximum integer value allowed (2^63 - 1), an error is returned.
  • The increment value must be an integer.

RESP2/RESP3 Reply​

  • Integer reply: the value of the key after the increment operation.