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4 cards from this section. Quick, good the night before a test.
What is the purpose of jstat?
Think about what kind of data we need to ensure the JVM is functioning well.
How do you use jmap to generate a heap dump?
Consider how we might analyze memory allocation.
What does the jmap command do?
Think about the tool that's most closely related to memory analysis.
True or False: jstat only works with the latest Java versions.
Consider how long the tools have been part of the Java ecosystem.
You have a Java application that is running slowly. Use the appropriate command-line tools to identify potential causes of performance issues. Discuss your approach.
Think sequentially about diagnosing performance: start with stats, dive into memory, then examine threads.
Your application is throwing OutOfMemoryErrors. How would you use jmap and jcmd to investigate and solve the problem?
Focus on understanding the state of memory at the time of the error.
6 more questions in this section. Enroll free to practise them all.
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