La Trobe University
The current rate of performance improvement for CPUs is much higher than that for memory or disk I/O. CPU performance doubles every 18 months while disk I/O improves at only 5-8 % per year. In addition, cheap disks mean object databases will become bigger as database designers realize that more data can be stored. A consequence of these facts is that disk I/O is likely to be a bottleneck in an increasing number of database applications. It should also be noted, memory is also becoming a more prevalent source of bottleneck on modern DBMS.