Hello sfdc experts and guru's

2 Questions from my end:--

1)  I looked at videos of informatica cloud and have seen that we can establish a connection(data sync) between  oracle server and salesforce .if i make a change in salesforce data  that change will be in sync with oracle server ( this is ok) .now if some other user of oracle server who hasnt installed informatica cloud makes change to the same oracle database table. will this change be reflected

2) I would love to get a step by step process on how to integrate salesforce with Informatica without using informatica cloud. Someone pls help regarding this.

Thanks

kartik