Parallel Change Design

Guide Java Enterprise developers through Parallel Change for database migration scenarios. This is an interactive SKILL.

What is covered in this Skill?

• Deciding whether a database migration needs a compatibility window
• Sequencing database changes as expand, migrate, and contract deployable steps
• Preserving old and new application versions during rollout and rollback windows
• Handling column renames, type or data reinterpretation, large backfills, relationship-table changes, and index or uniqueness changes
• Explaining tradeoffs such as temporary dual paths, extra migrations, verification effort, and delayed cleanup
• Routing framework-specific implementation to Spring Boot, Quarkus, or Micronaut Flyway skills after the design approach is clear

Constraints

Use Parallel Change as a database migration design pattern, then hand off implementation details to the framework-specific migration skill when needed.