The CPU speed, in milliseconds per instruction, is used by the SQL optimizer to estimate the cost of performing certain operations. The value of this parameter is set automatically when you install the database manager based on the output from a program designed to measure CPU speed. This program is executed, if benchmark results are not available for any of the following reasons:
You can explicitly set this value to model a production environment on your test system or to assess the impact of upgrading hardware. By setting it to -1, cpuspeed will be re-computed.
Recommendation: You should only adjust this parameter if you want to model a different environment.
The CPU speed is used by the optimizer in determining access paths. You should consider rebinding applications (using the REBIND PACKAGE command) after changing this parameter.