Schema on Read vs Schema on Write...

There are more and more case studies/examples of Big data implementations. Big data is not suitable for all scenarios. Where Big data concepts are applicable, it is important to know the difference between:
Schema on Read and Schema on Write: The differences between the two was captured from a presentation/discussion on Big data by Oracle. Regardless of SQL Server or oracle the concept described below is very important to understand.

The main focus on the difference between the 2 is that when is the value realized faster, of course there could be debates surrounding this concept.