In this post on LDD John D Curtis links to a new piece of Domino 7 documentation titled “Improving Domino 7 and DB2 Performance”.
“Improving IBM® Lotus® Domino® and DB2® Performance contains information to help you optimize the performance of your DB2 server running in a Domino and DB2 configuration. . The information in this document is intended for configurations that utilize medium size servers because the parameters are tuned for medium size server systems. Other hardware configurations may require additional adjustments.”
The documentation database can be found on LDD in the Technical Library (scroll down to the bottom).