During the requirements definition phase for a database application, performance is listed as a top
priority. To access the DBMS files, which of the following technologies should be recommended for
optimal I/O performance?

A.
Storage area network (SAN)

B.
Network Attached Storage (NAS)

C.
Network file system (NFS v2)

D.
Common Internet File System (CIFS)

Explanation:
In contrast to the other options, in a SAN comprised of computers, FC switches or routers and
storage devices, there is no computer system hosting and exporting its mounted file system for
remote access, aside from special file systems. Access to information stored on the storage devices
in a SAN is comparable to direct attached storage, which means that each block of data on a disk
can be addressed directly, since the volumes of the storage device are handled as though they are
local, thus providing optimal performance. The other options describe technologies in which a
computer (or appliance) shares its information with other systems. To access the information, the
complete file has to be read.