MySQL 8.0 for Developers — Lesson 2: Schema Design, Constraints, Indexes, Views, Metadata, and Data Integrity

Learning Objectives

• Explain the purpose and operating context of normalization, keys, relationships, table design, and naming.
• Apply primary, unique, foreign, check, not-null, and generated columns and B-tree and composite indexes, selectivity, covering access, and trade-offs in a controlled environment.
• Validate outcomes and troubleshoot risks involving views, metadata, DDL changes, online-change awareness, and migration tests.

Detailed Topics

• normalization, keys, relationships, table design, and naming
• primary, unique, foreign, check, not-null, and generated columns
• B-tree and composite indexes, selectivity, covering access, and trade-offs
• views, metadata, DDL changes, online-change awareness, and migration tests

Instructor Demonstration

Demonstrate normalization, keys, relationships, table design, and naming for an order application schema and data-access layer designed, tested, secured, and tuned for production; capture the exact configuration, code, command, transaction, query, dashboard, model, schedule, or report evidence that proves the expected result.

Hands-On Exercise

Complete a controlled MySQL 8.0 for Developers exercise covering primary, unique, foreign, check, not-null, and generated columns and B-tree and composite indexes, selectivity, covering access, and trade-offs; introduce an exception involving views, metadata, DDL changes, online-change awareness, and migration tests, diagnose it from evidence, apply the smallest reversible correction, and rerun acceptance checks.

1. Confirm scope, prerequisites, identities, dependencies, data, risks, and expected outcome.
2. Perform the course-specific configuration, development, administration, analysis, or business-process workflow.
3. Capture commands, settings, records, logs, screenshots, reports, metrics, or test results.
4. Compare the observed result with acceptance criteria and document corrective or preventive action.

Scenario Analysis

• Identify the technical or business decision and the stakeholders affected by it.
• Compare security, performance, reliability, compliance, cost, usability, and support trade-offs.
• Define rollback, recovery, communication, evidence, ownership, and escalation requirements.

Troubleshooting Guidance

Diagnose issues involving normalization, keys, relationships, table design, and naming, primary, unique, foreign, check, not-null, and generated columns, B-tree and composite indexes, selectivity, covering access, and trade-offs, views, metadata, DDL changes, online-change awareness, and migration tests without making an unverified production change. Separate symptoms from causes, gather time-correlated evidence, test a reversible hypothesis, validate the correction, and record recurrence controls.

Validation Checklist

• The requirement, environment, inputs, dependencies, and expected result are documented.
• The result is reproducible and supported by product-specific evidence.
• Normal, boundary, failure, security, performance, and operational conditions are reviewed.
• Exceptions, rollback, ownership, support actions, and the next improvement priority are recorded.

Lesson Outcome

Learners can apply Schema Design, Constraints, Indexes, Views, Metadata, and Data Integrity in a realistic MySQL 8.0 for Developers scenario and defend the result with documented evidence.