Sample Interview Questions on Jmeter

Q1: What is the use of Jmeter?


Ans: Jmeter is an open source desktop application software, 100% pure Java application, which is designed to perfom load testing of web based application.

Q2: Is it mandatory to install java first, to run jmeter?
Ans: Yes, Jmeter is an java based application. So you should install java 1.5 or later version in your system.

Q3: Can we do regression testing with Jmeter?
Ans: Yes we can, after-all it is all about java-script. :)

Q4: How we can run jmeter?
Ans: By simply clicking on Jmeter.bat, or by using commnad: C:\>Jmeter

Q5: What are the options, do you see when jmtere window opens?
Ans: 1. Test Plan 2. Workbench

Q6: Which component, do we need to add, to record script?
Ans: We need to add Http proxy server, by simply right clicking on Workbench > Non-Test elements > Http proxy server.
Also need to enable proxy, with port 8080, by going to internet settings> Connections > Lan. Name will be "localhost".

Then click on start button on jmeter http proxy server window.

Q7: Can we perform load testing of database with jmeter?
Ans: Yes we can. To see the process follow: Database load testing with jmeter link. You should be aware of sql queries.

Q8: What are listeners in Jmeter?
Ans: Listeners in jmeter are used to capture the response data of load test. We can have response data (result) in , cvs, image (graph) or in html format.

Q9: Name 4-5 listeners in jmeter, which are commonly used.
Ans: 1. View result tree 2. Summary report 3. Aggregate Graph 4. Response time vs thread 5. Composite graph

Q10: What is Response time in Jmeter report?
Ans: Response time in Jmeter report, is the time taken by web server, to answer the requested query. In simple words, it is the time taken by a web server to respond the http request.

Q11: What is median in jmeter listener?
Ans: It is a number which divides the samples into two equal halves. Half of the samples are smaller than the median, and half are larger.

Q12: What is throughput in jmeter listener?
Ans: Throughput is relation between time and data.It shows the relation between http request and unit time. Means how many requests are processed in how much time.

Throughput = Number of requests / Time(second or millisecond)

Q13: Which Jmeter elements are used for Parameterization?
Ans: 1. User parameter 2. CSV Data Set config

Q14: Which controllers are used as an conditional controllers in jmeter?
Ans: If controller and While controller

Q15: What is heap size in jmeter?
Ans: Jmeter is work in java, and heap size is related to java. Java heap is the heap size allocated to JVM applications which takes care of the new objects being created. If the objects being created exceed the heap size, it will throw an error of java.lang.out.of.memory.
Java's default heap size limit in Jmeter is 256 MB.

Q16: Is it possible that, if we increase the heap size in Jmeter, then application(jmeter) might not work?
Ans: Yes, it is possible. Because heap size depends upon the empty space of your machine in c drive as well as your RAM. If the RAM is 1 Gb and you increased the heap 2048, it may not work.