DUMP key

Time complexity: O(1) to access the key and additional O(NM) to serialized it, where N is the number of Redis objects composing the value and M their average size. For small string values the time complexity is thus O(1)+O(1M) where M is small, so simply O(1).

Serialize the value stored at key in a Redis-specific format and return it to the user. The returned value can be synthesized back into a Redis key using the command.

• It contains a 64-bit checksum that is used to make sure errors will be detected. The RESTORE command makes sure to check the checksum before synthesizing a key using the serialized value.
• An RDB version is encoded inside the serialized value, so that different Redis versions with incompatible RDB formats will refuse to process the serialized value.

The serialized value does NOT contain expire information. In order to capture the time to live of the current value the command should be used.

If does not exist a nil bulk reply is returned.

*Examples

redis> SET mykey 10

redis> DUMP mykey