Flash in the Oracle Exadata Database Machine is of lower latency (and enables faster access to
data) than:
A.
Memory
B.
Memory and locally attached disk
C.
Memory and network-attached disk
D.
Locally attached and network-attached disk
Explanation:
The Exadata Smart Flash Cache is also used to reduce the latency of log write I/O eliminating
performance bottlenecks that might occur due to database logging.
Flash memory has very good average write latency. It is faster than locally attached and networkattached disks. However, it is not faster than Memory (RAM).
Reference: Exadata Smart Flash Cache Features and the Oracle Exadata Database Machine,
Oracle White Paper