Performance issues

hi to all im new in here also kinda newbie in oe i have some problems about db server and client performance forgive me if i posted this message to wrong forum.

how can i maximize size of cache openedge using. recently i tried to use client and server performance parameters
but i couldnt make a progress. how can i prepare high performance db and server client relation. i am inexperienced about db management.

thanks for your interest.