Difference between Oracle 10g 64 bit /Oracle 10g 32 Bit Windows

Hi all
We are using 10g Oracle 32 Bit windows as well as Oracle 10g 64 Windows at some installations.
Now we tested these two systems in our office for Testing purpose on two similar machines i.e
Intel i3 with 4 GB RAM. Database size approx 4GB
We had the feeling that :-
a) Oracle datafile Filesize limitation may be there in 32 Bit system but we saw that physically around 3.5 GB datafile size
is created in 32 Bit windows also
b) Data Fetching Speed -.We thought that data fetching speed would be higher in 64 Bit machine. But we proved to
be wrong. Our sample data had approx 7 Millions records (based on Client Live data for 3 years) total in around 20 transaction tables. Further there were other additional 100-150 tables but very smaller ones just master tables
We used the same client end machine and same Front end and same queries on both servers. To our surpriise - We got the almost similar results in terms of data fetching time in both the 32 Bit as well as 64 Bit windows with similar Oracle 10g 32 bit and Oracle 64 Bit respectively
Further we find that Anti Virus Programme which may be any say Symatentic or other - troubles much more in Windows 64 Bit environment as compared to Windows 32 Bit environment from settings point of view.
Kindly advise as to
a) Whether our above observations are correct
b) Now under what situations should we use Oracle 10g 64 Windows as compared to Oracle 10g 32 Bit windows
Regards
Suresh Bansal

Hi Suresh;
Pelase check below link which could give you idea about your issue:
Comparison of 32-bit and 64-bit Oracle Database on windows
http://www.dell.com/downloads/global/solutions/oracle_performance_em64t_6850.pdf
Regard
Helios

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