Questions

1. What are the key differences between a relational database and a NoSQL database? Provide an example use case where a relational database would be a better fit than a NoSQL database and vice versa.
2. How would you scale a relational database system for a read-heavy and a write-heavy workload?
3. What is the CAP theorem and is it important when choosing which NoSQL implementation to use?

4. Why is it important to provide an abstraction layer between our business logic and the underlying database?
5. How would you go about adding a new method to the Indexer interface we discussed in the last part of this chapter?