Apache Jmeter Interviewquestions | Apache Jmeter Online Training

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APACHE JMETER INTERVIEW QUESTIONS
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1.EXPLAIN APACHE JMETER?

• The Apache JMeter desktop application is open to
  the source software, a 100 pure Java
  application designed to load test functional
  behavior and measure performance. It was
  originally designed for testing Web Applications
  but has since expanded to other test functions.
• JMeter is not a browser. As far as web-services
  and remote services are concerned, JMeter looks
  like a browser (or rather, multiple browsers)
  however JMeter does not perform all the actions
  supported by browsers. In particular, JMeter does
  not execute the Javascript found in HTML pages.
  Nor does it render the HTML pages as a browser
  does (it's possible to view the response as HTML
  etc, but the timings are not included in any
  samples, and only one sample in one thread is
  ever viewed at a time).

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2.WHAT CAN I DO WITH THE APACHE JMETER?

• Apache JMeter may be used to test performance
  both on static and dynamic resources (files,
  Servlets, Perl scripts, Java Objects, Data Bases
  and Queries, FTP Servers and more). It can be
  used to simulate a heavy load on a server,
  network or object to test its strength or to
  analyze overall performance under different load
  types. You can use it to make a graphical
  analysis of performance or to test your
  server/script/object behavior under heavy
  concurrent load.

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3. WHAT DOES APACHE JMETER DO?

• Apache JMeter features include below
• Can load and performance test many different
  server types
• Web - HTTP, HTTPS
• SOAP
• Database via JDBC
• LDAP
• JMS
• Mail - SMTP(S), POP3(S) and IMAP(S)
• Native commands or shell scripts
• Complete portability and 100 Java purity .
• Full multithreading framework allows concurrent
  sampling by many threads and simultaneous
  sampling of different functions by separate
  thread groups.
• Careful GUI design allows faster operation and
  more precise timings.
• Caching and offline analysis/replaying of test
  results.
• Highly Extensible
• Pluggable Samplers allow unlimited testing
  capabilities.
• Several load statistics may be choosen with
  pluggable timers .

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4.EXPLAIN THE REMOTE TESTING IN 'PROPER WAY'?

• You have
• 1. Your application server. You shouldn't run
  anything on this machine that you wouldn't have
  running on it in your proposed or actual
  production environment (if you are running
  anything else, including JMeter, you will be
  adding load to the server and thus tainting your
  results).
• 2. One or more machines running jmeter-server
  (the JMeterEngine). You want these machines to be
  reasonably close (network wise) to the
  application server. By "reasonably close" I mean
  on the same Ethernet segment or at least with no
  low speed links between them. The JMeter User
  Manual provides reasonable information about
  doing this.
• 3. A single machine running the JMeter GUI that
  you use to control the machines running the
  JMeterEngine.
• While you are developing your scripts and
  for only moderate levels of user testing
  (assuming you are "close" to the application
  server) you do not need to involve any
  JMeterEngine machines. The reason you have these
  are to
• 1. Eliminate the impact of slow network
  connections when you are not "close" to the
  application server.
• 2. Execute more than test threads than your local
  machine is capable of handling.

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5.HOW CAN I DO THE STRESS TESTING OF EJBS?

• You can use the UserManual/Reference/JavaSampler
  classes to write your own class that runs your
  EJB's, and then JMeter will take over the
  threading and reporting. This, however, is not
  ideal. Someone needs to write a good EJB Sampler
  implementation for JMeter (hint, hint).

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