Fig. 6.3.2 Hadoop-based satellite.

In other words, the idea is to allow the business to augment their current infrastructure by
adding a NoSQL platform to the mix while retaining the value and use of their currently
existing RDBMS engines, not to mention all the historical data they already contain.

What Are Hard and Soft Business Rules?

Business rules are the requirements translated into code. The code manipulates the data
and in some cases turns data into information. Part of Data Vault 2.0 system of BI is to
enable agility (which will be covered a bit more in the methodology section of this
chapter). Agility is enabled by first splitting the business rules into two distinct groups:
hard rules and soft rules (Fig. 6.3.3).

Chapter 6.3: Introduction to Data Vault Architecture