Redis

The Redis SETNX command sets a key to a given value, but only if the key doesn’t already exist. If the key already holds a value, no operation is performed.

Note: The SET command can do the same thing, and it’s possible that the SETNX command may be deprecated at some point. Therefore, it’s probably a good idea to use SET instead of SETNX if possible.

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In Redis, the MSETNX command allows us to set multiple keys at once, but only if none of them exist.

This allows us to set multiple keys representing different fields of a single logical object in a way that ensures that either all the fields are set, or none are set.

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In Redis, the MGET command allows us to get the values of multiple keys at once. The values are returned in an array reply.

If a specified key doesn’t exist, MGET returns nil for that key.

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In Redis, the MSET command allows us to set multiple keys at once. It replaces any existing values, just as SET does.

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In Redis, the SET command sets a key to hold a given string value.

If the key already holds a value, it is overwritten with the new value. Also, any previous time to live associated with the key is discarded (assuming a successful SET operation).

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In Redis, the GET command returns the value of a given key. If the key doesn’t exist, it returns nil.

An error is returned if the value stored at key is not a string.

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