I/O contention on 10g database - windows server

Hello Everyone

I have an ongoing performance issue on a 10.2.0.5 database hosted on Windows 2008 server.

Physical memory utilisation on the db server is quite high at 90%.

I have attached the ADDM report as well.  Messages in this related to hard parsing and invalid cursors could be due to flush shared_pool which I did.

Requesting help from Performance Tuning experts.

Event	Waits	Time(s)	Avg Wait(ms)	% Total Call Time	Wait Class
CPU time		1,651		73.3
db file sequential read	149,021	456	3	20.2	User I/O
direct path read	51,278	48	1	2.1	User I/O
log file parallel write	13,907	46	3	2.1	System I/O
log file sync	8,345	45	5	2.0	Commit

Wait Class