= MSET key1 value1 key2 value2 ... keyN valueN (Redis >= 1.1) =

MSETNX _key1_ _value1_ _key2_ _value2_ ... _keyN_ _valueN_ (Redis >

1.1) = Time complexity: O(1) to set every key

Set the the rispective keys to the rispective values. MSET will replace oldvalues with new values, while MSETNX will not perform any operation at alleven if just a single key already exists.

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

Both MSET and MSETNX are atomic operations. This means that for instanceif the keys A and B are modified, another client talking to Redis can eithersee the changes to both A and B at once, or no modification at all.

MSET Return value

Status code reply Basically +OK as MSET can't fail

MSETNX Return value

Integer reply, specifically:

1 if the all the keys were set
0 if no key was set (at least one key already existed)

See also

• MGET
• DEL (DEL supports deleting multiple keys in a single operation)