SGA Setting on Window

hey Everyone
sir i've just start our career as DBA. My boss give me assignment to performance and tuning of SGA. what would be the size of SGA if i've 4GB RAM How we calculate which size optimal for SGA what amount of memory allocate to SGA. let me inform our aplication data in millions 20 to 30 million. our basci intend to load data in database fastly. when we load data our cpu and memory acesses are normal and loading of 8 million data take 4 to 5 hour. we want to maximize the utilization of CPU and Memory. what i do plz give me suggestion what parameter keep in ur mind while setting the sga size any document which is helpful for me plz send me link i'm highly greatful to u

Hi..
You can refer to [http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:30011178429375]
[http://www.dba-oracle.com/t_sga_sizing.htm]
HTH
Anand

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