Module 30: Database Ecosystem

MODULE 30 · 4 LESSONS

Compare relational, document, serverless and wide-column systems by consistency, query shape and operating model.

Project checkpoint: Model CourseFlow enrollment in four database families and reject the designs that cannot protect its core invariants.

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Module 30 learning loop

Module 30 learning loop: a practical sequence used in this lesson.

Apply relational design skills to the related, but independently evolving, MySQL and MariaDB ecosystems.
Design a wide-column table from a known query and accept denormalization deliberately instead of importing relational habits.
Use InnoDB transactions, constraints, indexes in one coherent implementation.
Complete this evidence-backed checkpoint: Model CourseFlow enrollment in four database families and reject the designs that cannot protect its core invariants.

Lesson 30.1

Apply relational design skills to the related, but independently evolving, MySQL and MariaDB ecosystems.

Lesson 30.2

Use SQL Server's relational guarantees while learning the dialect and tooling differences that affect a production application.

Lesson 30.3

Model a small real-time feature in Firestore while treating security rules and billing-shaped queries as application code.

Lesson 30.4

Design a wide-column table from a known query and accept denormalization deliberately instead of importing relational habits.

PROJECT CHECKPOINT

Model CourseFlow enrollment in four database families and reject the designs that cannot protect its core invariants.

Write acceptance criteria for InnoDB transactions before implementation.
Keep the change small enough that a reviewer can connect it to the intended behavior.
Use the most direct check available for constraints and save the result.
Record one decision you would keep and one you would revisit after feedback.

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