msetnx.3valkey - Man Page

Atomically modifies the string values of one or more keys only when all keys don’t exist.

Synopsis

MSETNX key value [key value ...]

Description

Sets the given keys to their respective values. MSETNX will not perform any operation at all even if just a single key already exists.

Because of this semantic MSETNX can be used in order to set different keys representing different fields of a unique logic object in a way that ensures that either all the fields or none at all are set.

MSETNX is atomic, so all given keys are set at once. It is not possible for clients to see that some of the keys were updated while others are unchanged.

Reply

One of the following:

Complexity

O(N) where N is the number of keys to set.

Acl Categories

@slow @string @write

History

Examples

127.0.0.1:6379> MSETNX key1 "Hello" key2 "there"
(integer) 1
127.0.0.1:6379> MSETNX key2 "new" key3 "world"
(integer) 0
127.0.0.1:6379> MGET key1 key2 key3
1) "Hello"
2) "there"
3) (nil)

See Also

append(3valkey), decr(3valkey), decrby(3valkey), get(3valkey), getdel(3valkey), getex(3valkey), getrange(3valkey), incr(3valkey), incrby(3valkey), incrbyfloat(3valkey), lcs(3valkey), mget(3valkey), mset(3valkey), set(3valkey), setrange(3valkey), strlen(3valkey)

Info

2024-09-23 8.0.0 Valkey Command Manual