Oracle WebLogic Server 12c: Troubleshooting Workshop Ed 3 — Lesson 3: Thread, Memory, CPU, and Performance Diagnosis

Technical Scope

• execute threads, hogging and stuck threads, work managers, and queue behavior
• heap pressure, garbage collection, leaks, native memory, and allocation patterns
• CPU hot spots, lock contention, network latency, and downstream dependency impact
• baseline comparison, load reproduction, tuning constraints, and measured result

Instructor Demonstration

The instructor will analyze and reconcile execute threads, hogging and stuck threads, work managers, and queue behavior in the context of a production-like WebLogic domain experiencing intermittent deployment, JDBC, JMS, thread, and memory incidents. The demonstration captures commands, configuration, transactions, output, logs, plans, or screenshots that prove both the intended behavior and the control boundary.

Applied Workshop

Learners complete a controlled exercise covering heap pressure, garbage collection, leaks, native memory, and allocation patterns and CPU hot spots, lock contention, network latency, and downstream dependency impact, then introduce a realistic exception involving baseline comparison, load reproduction, tuning constraints, and measured result. They record assumptions, exact steps, expected and observed results, a reversible correction, and the evidence required for operational acceptance.

1. Confirm scope, identities, data, dependencies, controls, and expected result.
2. Perform the product-specific configuration, development, analysis, or business-process task.
3. Capture reproducible technical or transaction evidence and compare it with the expected value.
4. Explain the operational, security, performance, data-quality, or business trade-off.

Validation Standard

Acceptance for Thread, Memory, CPU, and Performance Diagnosis requires the result to be reproducible, traceable to approved inputs, consistent with the relevant Oracle or platform behavior, and supported by checks for security, data integrity, reliability, performance, and recoverability.

• The intended target, scope, and ownership are verified.
• Expected-value and negative-path checks pass.
• Security, reliability, performance, data quality, and support impacts are reviewed.
• Unexpected behavior is resolved before acceptance.

Failure Analysis

When the result differs from expectation, learners isolate the smallest proven cause across execute threads, hogging and stuck threads, work managers, and queue behavior, heap pressure, garbage collection, leaks, native memory, and allocation patterns, CPU hot spots, lock contention, network latency, and downstream dependency impact; they avoid speculative production changes, preserve evidence, apply the lowest-risk correction, rerun the test, and document prevention.

Practical Outcome

Complete and defend a validated result for Thread, Memory, CPU, and Performance Diagnosis with a reusable implementation record or runbook.