MSET

The MSET command in DiceDB is used to set multiple key-value pairs in a single atomic operation. This command is particularly useful for reducing the number of round-trip times between the client and the server when you need to set multiple keys at once.

Syntax

MSET key1 value1 [key2 value2 ...]

Parameters

Parameter	Description	Type	Required
`key1, key2, ...`	The keys to be set.	String	Yes
`value1, value2, ...`	The values to be associated with the respective keys.	String	Yes

Return values

Condition	Return Value
The command returns `OK` if the operation is successful.	A string value

Behaviour

When the MSET command is executed:

DiceDB sets the specified keys to their respective values.
This operation is atomic, meaning that either all the keys are set, or none of them are.
This ensures data consistency and integrity.
Any pre-existing keys are overwritten and their respective TTL (if set) are reset.

Errors

The MSET command can raise errors in the following scenarios:

Wrong number of arguments: If the number of arguments is not even (i.e., there is a key without a corresponding value), DiceDB will return an error:
Terminal window
```
(error) ERROR wrong number of arguments for 'mset' command
```
Non-string keys or values: If any of the keys or values are not strings, DiceDB will return an error:
Terminal window
```
(error) ERROR value is not a valid string
```

Example Usage

Basic Example

To set multiple key-value pairs in DiceDB:

127.0.0.1:7379> MSET key1 "value1" key2 "value2" key3 "value3"
OK

Example with Retrieval

To set multiple key-value pairs and then retrieve them:

127.0.0.1:7379> MSET name "Alice" age "30" city "Wonderland"
OK
127.0.0.1:7379> GET name
"Alice"
127.0.0.1:7379> GET age
"30"
127.0.0.1:7379> GET city
"Wonderland"

Error Example

Attempting to set an odd number of arguments:

127.0.0.1:7379> MSET key1 "value1" key2
(error) ERROR wrong number of arguments for 'mset' command