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Oracle WebLogic Server 12c Advanced Administration Cookbook

You're reading from   Oracle WebLogic Server 12c Advanced Administration Cookbook If you want to extend your capabilities in administering Oracle WebLogic Server, this is the helping hand you've been looking for. With 70 recipes covering both basic and advanced topics, it will provide a new level of expertise.

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Product type Paperback
Published in Jun 2013
Publisher
ISBN-13 9781849686846
Length 284 pages
Edition Edition
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Author (1):
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Dalton Iwazaki Dalton Iwazaki
Author Profile Icon Dalton Iwazaki
Dalton Iwazaki
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Table of Contents (15) Chapters Close

Oracle WebLogic Server 12c Advanced Administration Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Install, Configure, and Run FREE CHAPTER 2. High Availability with WebLogic Clusters 3. Configuring JDBC Resources for High Availability 4. Configuring JMS Resources for Clustering and High Availability 5. Monitoring WebLogic Server 12c 6. Troubleshooting WebLogic Server 12c 7. Stability and Performance 8. Security Index

Analyzing a heap dump


A heap dump is another important feature of the Java Virtual Machine. It contains a memory dump of all the current live Java objects of the heap.

The heap dump is useful in problematic situations, such as in a memory leak condition in a WebLogic Server where the heap usage grows until the JVM crashes by Out of Memory (OOM), or when the heap utilization is so high that the Managed Server hangs and stops responding. Both scenarios can use a heap dump to discover the offender objects in the heap.

This recipe will display how to take a heap dump from a Managed Server in the HPROF format. HPROF is a binary file that stores the heap and CPU profiles of the JVM. For demonstration purposes, the heap dump was taken from a JVM configured to a small heap with a maximum size of 256 MB (-Xmx256mb).

Getting ready

The heap dump can be taken from the shell using the jrcmd command-line tool or from the Mission Control.

The heap dump will be analyzed with the Eclipse Memory Analyzer (MAT...

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