Chapter 6: Data: The Architect's Most Important Decision

Data decisions outlast every other architectural decision. This chapter covers data modeling, storage selection, data ownership in distributed systems, event sourcing, CQRS, and the consequences of getting data architecture wrong.

What this chapter covers

Choosing the right database: SQL vs. NoSQL vs. NewSQL
Data modeling in distributed systems
Data ownership and bounded contexts
Event sourcing: when and how to use it
CQRS and read model projections
Zero-downtime database migration strategies
Data mesh and data architecture at scale
Lambda and Kappa streaming architectures

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