This advanced L300 course equips Database Administrators and Cloud Engineers with the expertise to maximize throughput, eliminate query bottlenecks, and unify relational and graph data models natively within Spanner. Learners will design high-performance schemas using parent-child table interleaving and covering secondary indexes, optimize complex queries with stale reads and parameterized execution, and build Zero-ETL property graph schemas using Spanner Graph and GoogleSQL/ISO GQL.