Oracle Database 19c: Performance Management and Tuning — Lesson 2: Instance Memory, Wait Events, Concurrency, and Resource Contention

Learning Objectives

• Explain the architecture, workflow, or business purpose behind SGA and PGA components, advisors, and allocation trade-offs.
• Apply wait classes, session waits, and time-model correlation and locks, latches, mutexes, enqueue contention, and blocking chains in a controlled scenario.
• Validate outcomes and troubleshoot risks involving process, CPU, concurrency, and Resource Manager evidence.

Detailed Topics

• SGA and PGA components, advisors, and allocation trade-offs
• wait classes, session waits, and time-model correlation
• locks, latches, mutexes, enqueue contention, and blocking chains
• process, CPU, concurrency, and Resource Manager evidence

Instructor Demonstration

Demonstrate SGA and PGA components, advisors, and allocation trade-offs within an order-processing workload whose response time degrades during peak volume and requires evidence-led diagnosis, then capture the exact configuration, command, transaction, report, model, query, code, or process evidence that proves the result for lesson 2.

Hands-On Exercise

Implement a controlled exercise covering wait classes, session waits, and time-model correlation and locks, latches, mutexes, enqueue contention, and blocking chains, then introduce and resolve an exception involving process, CPU, concurrency, and Resource Manager evidence while preserving before-and-after evidence.

1. Confirm the environment, identities, inputs, dependencies, risks, and expected outcome.
2. Complete the course-specific configuration, development, analysis, or process workflow.
3. Capture settings, commands, data, outputs, logs, reports, screenshots, calculations, or test results.
4. Compare the observed result with acceptance criteria and document corrective action.

Scenario Analysis

• Identify the technical or business decision that must be made.
• Compare valid approaches and their security, performance, reliability, cost, compliance, and support trade-offs.
• Define rollback, recovery, ownership, communication, and evidence requirements.

Troubleshooting Guidance

Diagnose issues across SGA and PGA components, advisors, and allocation trade-offs, wait classes, session waits, and time-model correlation, locks, latches, mutexes, enqueue contention, and blocking chains, process, CPU, concurrency, and Resource Manager evidence without making an unverified production change. Separate symptoms from causes, gather evidence, test the smallest reversible correction, rerun validation, and record preventive action.

Validation Checklist

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

Lesson Outcome

Learners can apply Instance Memory, Wait Events, Concurrency, and Resource Contention in a realistic Oracle Database 19c: Performance Management and Tuning scenario and validate the result with documented evidence.