eCommerce involves businesses buying or selling goods or services online, requiring systems that meet high customer expectations for personalization, speed, and zero downtime. To achieve this, eCommerce platforms are structured in layers, starting from customer-facing interfaces like websites and apps, through core functionalities such as shopping carts and transaction processing, down to the operational backbone and infrastructure that ensure data accuracy and system resilience. A distributed database, such as CockroachDB, supports these systems by enabling global scale, zero downtime, and data consistency, crucial for handling transactional data and maintaining performance across multiple regions. This architecture allows for adaptability to fluctuating workloads and ensures regulatory compliance by controlling data locality. CockroachDB's features like regional and global tables optimize data access and placement, addressing the diverse needs of eCommerce applications in different geographical areas, ensuring low latency, and maintaining high availability and performance.