New install of applications, such as oracle, ..., doesn't perform
as well as expected, given the platform.  This is not due to hardware,
rather it caused by untuned O/S parameters.      

A few common parameters are presented:

parameter		default		suggested
---------		-------		---------
rlim_fd_max		64		1024
rlim_fd_cur		64		1024
tcp_conn_req_max_q	128		256, 512, or 1024
tcp_xmit_hiwat		8192		32768	(fast ethernet only)
tcp_recv_hiwat		8192		32768	(fast ethernet only)


In particular, the lack of available file descriptors can
result in a serious performance hit, as they are prerequisite
to everything from communication endpoints to file handles.

For a good srdb on how to  change file descriptor limit in Solaris,
see SRDB 11112.

Particular applications often have their own set of parameters
in /etc/system.