Database Selection, Replicas, Caches, and Proxies

Where this lesson fits

This lesson covers Domain 3: Design High-Performing Architectures, Task 3.3: Determine high-performing database solutions. Domain 3 represents 24% of the scored content of SAA-C03. Questions in this task describe a data access pattern (relational joins, key-value lookups at millions of requests per second, a read-heavy catalog, a connection storm from Lambda) and ask which database engine, which scaling mechanism (replicas, caching, a proxy, partitioning), and which capacity mode meet the performance requirement with the least operational effort.