RE: Number of CPUs vs. Speed of CPUs

• "MacGregor, Ian A." <ian_at_SLAC.Stanford.EDU>

> In general, for Oracle, it is better to have four 500 MHz CPU's than two
> 1000 MHz CPU's. Please keep in mind if your system is I/O bound then
> more/faster CPU's won't help.

Oracle can easily make things worse for itself due to I/O overhead for rollback and lock management. It isn't very hard to get constipated disk systems w/ SPM and Oracle.

You also end up with a major bottleneck at the bus controller on most systems. Paged I/O and disk commands can easily strangle the system.

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