Skip to main content

INCRBYFLOAT

Increments the value of a key by the specified floating-point increment.

Syntax​

INCRBYFLOAT key increment

Parameters​

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

Details​

  • Available since: 2.6.0
  • Time complexity: O(1)
  • ACL categories: @write, @string, @fast

The INCRBYFLOAT command increases the value stored at key by the specified floating-point 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. The new value is stored as a string, even if the value was originally stored as an integer.

Examples​

Basic Usage​

Assume we have a key called mykey with the value "10.5":

SET mykey "10.5"

To increment the value of mykey by 0.7:

INCRBYFLOAT mykey 0.7

This will return:

"11.2"

The value of mykey will now be "11.2".

Handling a Non-Existent Key​

If the key does not exist:

INCRBYFLOAT newkey 2.5

This will return:

"2.5"

The key newkey is now set to "2.5".

Edge Cases​

  • If the key holds a value that cannot be represented as a floating-point number, an error is returned.
  • If the resulting value after the increment operation exceeds the precision limits of floating-point numbers, an error is returned.

RESP2/RESP3 Reply​

  • Bulk string reply: the value of the key after the increment operation, returned as a string.