How is atomicity achieved in Redis increments?

6 months ago

1 minute

In Redis, the INCR command can be used to increment the value of a key atomically. This command increments the value of the key by 1 and returns the new value, ensuring that the operation is atomic and not affected by concurrent actions.

Here is a sample code:

$ redis-cli
127.0.0.1:6379> SET mykey 10
OK
127.0.0.1:6379> INCR mykey
(integer) 11

In the example above, the value of key “mykey” was first set to 10 using the SET command, followed by an atomic increment operation on the value of mykey using the INCR command, resulting in a final return value of 11.

It is important to note that the INCR command can only operate on keys that store integer values. If the key does not exist or the stored value is not of integer type, an error will be returned.