HI,
Not sure of the sap standard but look at link.
http://www.datadisk.co.uk/html_docs/maxdb/overview.htm
They have basic formula on page if you are running on sap.
Refer also to
http://maxdb.sap.com/training/internals_7.6/kernel_parameters_EN_76.pdf
Another thing I tend to notice if you set value to 1 you have collisions and problems also refer to link.
http://scn.sap.com/thread/1813598
Regards,
Johan