AccumulateBy with Connection change

Hi Team,

I have cube with 800M rows and it is currently building incrementally.

I got scenario where my DB source upgraded and I should change my connectivity of cube. What should happens if build a schema build? will my build bring only latest data or do we need to go with a full build?

How we can avoid complete build?

Please help to understand what will happen to accumulate build when we change the connection string.

Thanks

NH