It
always challenges the capability of big data techniques
to process the large-scale datasets that are
increasingly being gathered through ubiquitous
and remote sensing technologies, cameras, microphones,
RFID readers, and wireless sensor networks.
Velocity refers to dataflow speed—that is,
the rate of data generation from heterogeneous
sources and how quickly the data is processed to
meet certain requirements. Variety indicates the
presence of different types of data.