move key db
dump key
restore key ttl value
migrate host port key|"" destination-db timeout [copy] [replace] [keys key [key
migrate 127.0.0.1 6380 hello 0 1000
migrate 127.0.0.1 6380 hello 0 1000
migrate 127.0.0.1 6380 hello 0 1000
mset key1 value1 key2 value2 key3 value3
migrate 127.0.0.1 6380 "" 0 5000 keys key1 key2 key3