MySQL 8.0 for Developers — Lesson 3: Transactions, Locking, Stored Programs, Triggers, Events, and Error Handling

Learning Objectives

• Explain the purpose and operating context of autocommit, isolation levels, MVCC, locking, deadlocks, and retry.
• Apply stored procedures, functions, parameters, variables, cursors, and handlers and triggers, OLD and NEW values, recursion risks, and audit use cases in a controlled environment.
• Validate outcomes and troubleshoot risks involving event scheduler, atomicity, exceptions, diagnostics, and test fixtures.

Detailed Topics

• autocommit, isolation levels, MVCC, locking, deadlocks, and retry
• stored procedures, functions, parameters, variables, cursors, and handlers
• triggers, OLD and NEW values, recursion risks, and audit use cases
• event scheduler, atomicity, exceptions, diagnostics, and test fixtures

Instructor Demonstration

Demonstrate autocommit, isolation levels, MVCC, locking, deadlocks, and retry 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 stored procedures, functions, parameters, variables, cursors, and handlers and triggers, OLD and NEW values, recursion risks, and audit use cases; introduce an exception involving event scheduler, atomicity, exceptions, diagnostics, and test fixtures, 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 autocommit, isolation levels, MVCC, locking, deadlocks, and retry, stored procedures, functions, parameters, variables, cursors, and handlers, triggers, OLD and NEW values, recursion risks, and audit use cases, event scheduler, atomicity, exceptions, diagnostics, and test fixtures 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 Transactions, Locking, Stored Programs, Triggers, Events, and Error Handling in a realistic MySQL 8.0 for Developers scenario and defend the result with documented evidence.