NoSQL Expert Patterns (Cassandra & DynamoDB) Overview This skill provides professional mental models and design patterns for distributed wide-column and key-value stores (specifically Apache Cassandra and Amazon DynamoDB). Unlike SQL (where you model data entities), or document stores (like MongoDB), these distributed systems require you to model your queries first . When to Use - Designing for Scale : Moving beyond simple single-node databases to distributed clusters. - Technology Selection : Evaluating or using Cassandra , ScyllaDB , or DynamoDB . - Performance Tuning : Troubleshooting "hot…