The Common posiblity of Oracle Effieciency

I have been tasked with recognising modes we can melody our Oracle database for better performance. First, I desire to understand what are the most widespread determinants of oracle db presentation problems? What should I be looking for and when?
It's unrealistic to response this inquiry in a couple of sentences. Your best wager is to confer one of the very good presentation tweaking publications actually on the market. I particulary suggest Cary Millsap and Jeff Holt's Optimizing Oracle performance , and Oracle presentation tweaking 101, by Vaidyanatha, Deshpande and Kostelac. Briefly, though, the most widespread determinants of Oracle presentation difficulties are submissions that origin the database motor to manage much more work than is essential to accomplish the yearned result; poorly-designed database schemas; and poorly-designed databases. These can manifest themselves in numerous ways: unwarranted CPU utilisation due to too numerous ordered I/Os (visits to database blocks in memory), unwarranted computer disk reads due to missing catalogues, or unwarranted contention for distributed resources.