MSETNX command in redis

MSETNX key1 value1 key2 value2 ... keyN valueN

Set the respective keys to the respective values.

TIME COMPLEXITY: O(1) to set every key

Note: MSETNX will not perform any operation at all even if just a single key already exists.

RETURN VALUE: Integer reply, specifically:

1 if all the keys were set

0 if no key was set (at least one key already existed)

Syntax:

MSETNX key1 value1 key2 value2 ... keyN valueN

Example 1: When the key is already present

redis:6379> MSETNX  redisKey1 value4
(integer) 0

Output

0

Example 2: When the key is not already present

redis:6379> MSETNX redisKey3 value4
(integer) 1

Output

1