Solaris tuneable parameters

I am running SE 5.10 on an Sun E250 with Solaris 2.6 HW 5/98 (256 Mb's). When running my application I get an SQL error -255. Tech support for my application said I should beincreasing my tunable parameters for max file locks, max file descriptors, number of processes per user, and number of processes per system. I have been able to increase the file descriptor and increased maxusers to 512 (which also affects max processes/system and max process/user) however I stilll am getting the error. Does anyone have an idea of what the parameter is to increase the max file locks under Solaris? Also, how high should I able to set maxusers? Should I be increasing it by 10's, 100's, 1000's? Thanks Tom Hamilton