Code Mill Hub | Backend Engineering https://code-mill-hub.com/blog/ Deep dives into Java, Spring Boot, and high-performance backend architecture. en-us shflzp12@gmail.com (Maria) shflzp12@gmail.com (Maria) Wed, 17 Jun 2026 00:00:00 GMT https://code-mill-hub.com/blog/spring-boot/2026-06-17-database-sharding-scalable-microservices-spring-boot-jpa-postgresql/ Database Sharding with Spring Boot and PostgreSQL: Routing, Resharding, and Operational Boundaries https://code-mill-hub.com/blog/spring-boot/2026-06-17-database-sharding-scalable-microservices-spring-boot-jpa-postgresql/ Decide when PostgreSQL sharding is justified, choose a stable shard key, route Spring Boot transactions safely, preserve uniqueness and idempotency, plan cross-shard queries, and migrate data without losing writes. Wed, 17 Jun 2026 00:00:00 GMT shflzp12@gmail.com (Maria) Database ShardingSpring BootPostgreSQLJPAData RoutingReshardingDistributed Systems