INCRBY command in redis

INCRBY key integer

Increment the number stored at the key by the given value. If the key does not exist or contains a value of the wrong type, set the key to the value of "0" before performing the increment or decrement operation.

TIME COMPLEXITY: O(1)

Note: INCRBY  commands are limited to 64-bit signed integers.

RETURN VALUE: Integer reply, this command will reply with the new value of the key after the increment or decrement.

Syntax:

INCRBY  KEY_NAME VALUE

Example 1: When the value is in the range of 64-bit.

redis:6379> SET MY_KEY 100
"OK"
redis:6379> INCRBY MY_KEY 100
(integer) 200

Output

200

Example 2: When the value is not an integer.

redis:6379> SET MY_KEY 100.717
"OK"
redis:6379> INCRBY MY_KEY 100
(error) value is not an integer or out of range

Output

(error) value is not an integer or out of range

Example 3: When the value is out of range of 64-bit

redis:6379> SET MY_KEY 1.8446744e+20
"OK"
redis:6379> INCRBY MY_KEY 100
(error) value is not an integer or out of range

Output

(error) value is not an integer or out of range