poor memory performance

Hi all,

I have a system (6800 domain with oracle databases+tomcat servers)
with 20G physical memory and 30G swap, in the last days i can see that
the space used memory is:

~8Gb free physical memory and ~0-1'5Gb free swap, i want that the system
no swapping while have physical memory, how i could resolve it?, config
oracle and tomcat applications? or tuning memory kernel parameters?.

thanks
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