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LoadRunner Interview Questions

LoadRunner is a performance and testing product that is automated and serves to examine the behavior and performance of the system at the time of actual load generation. LoadRunner interview questions are purely based upon your technical knowledge and practical work experience. Thus, you have to be very good with your technical preparation and confidence. If you have all the techniques clear in your mind and are able to answer any technical question based upon your work till now, then it would be easier for you to win the job with the help of following guidelines. The guidelines given below has the most common interview questions for job positions in LoadRunner and general software testing. It also gives tips on how to answer each of these questions.

Here is a list of the most common LoadRunner interview questions.

Question 1: Explain the concept of load testing.

Load testing is to test that if the application works well with the loads that result from a large number of users working at a time, transactions and to determine weather it can deal with the peak usage periods.

Question 2: What is Performance testing?

Both read and update transactions should be checked for their timings. They should be collectively tested for if the functions of the system are performed in an acceptable time-frame or not. This performance testing is carried out in a multi user environment and as a standalone process. This helps you determine the impact of multiple transactions on the time span of a single transaction.

Question 3: How do you plan the load? What are the important components that you consider?

The number of users can be decided through the planning of load. It also focuses upon what kind of machines you can use and where they run from. While load planning, the task distribution diagram and transaction profile play an important role. The task distribution diagram decides the peak usage and off-usage. The diagram provides the information on the number of users for a particular transaction and the time span of the load. On the other hand, the transaction profile provides the information on the names of transactions and the priority levels regarding the scenario that you decide.

Question 4: What are the components of LoadRunner? What components would you use for recording a script?

The Virtual User Generator, Controller, and the Agent process, LoadRunner Analysis and Monitoring, and LoadRunner Books Online are the components of LoadRunner. The Virtual User Generator (VuGen) component is used to record a script. By using this VuGen, you can develop Vuser scripts which are suitable for a number of applications and communication protocols.

Question 5: Tell me something about correlation. Can you explain the difference between automatic correlation and manual correlation?

This question is a chance for you to exhibit your deep preparation and clear understanding of concepts. You can say that correlation is applied to gain unique data for every run of the script that are generated through nested queries. This process provides you with the value that helps avoid errors as well as the nested queries. In automatic correlation, there are certain rules for correlation. Such rules create the data that replace the previous values. This automatic correlation can also be server specific. In manual correlation, the values to be correlated are scanned and then correlated by using 'create correlation'.

Question 6: How can you call a WinRunner script from a Loadrunner?

There is a specific protocol to be followed for calling a WinRunner script for a LoadRunner. It would be better if you exaplain the protocol to the point.

First exchange a VUser script for GUI WinRunner script
generate a scenario
Select 'Details' from the host menu
Select the check box for GUI WinRunner
Accomplish the scenario

Question 7: What are the changes that can be made in run-time settings?

There are four types of setting changes that can be made in run-time:

  • Pacing Iteration count
  • Log Disable Logging Standard Log
  • General Set the Vusers as process and each step has a transaction
  • Extended think time Two options: Ignore think time and replay think time

Question 8: Explain the Configuration of your systems?

This question refers to the configurations of the client machines as well as those machines that are run on the Vusers. While mentioning the configuration, include the hardware settings, memory, operating system, development tools, and software applications. These are the main components that you should not forget to mention. The overall system configuration includes the Web server, network infrastructure, the database server, and some other components too that are needed in order to attain the objectives of load testing. Make sure that the system component configuration that you mention should match with this overall system configuration.

Question 9: What is the purpose behind creating the parameters?

A tester has to create the parameters that are like the script variables. The purpose for creating these parameters is that they are to be used to change the input provided to the server and compete the real users. Each time you run the script, different datasets will be sent to the server. To simulate the usage model in order to attain more accurate testing from the controller, multiple users on the system can be emulated by a single script.

Question 10: How to identify performance bottlenecks?

For answering this question, you should be able to explain performance bottlenecks. When the system fails to perform up to your expectations, it becomes necessary to identify the basic problem and its source. Performance bottlenecks can be identified by using monitors. They can be either application server monitors, database server monitors, network monitors, or Web server monitors. With the help of these monitors, you can find out the troubled area in your particular scenario. This tends to cause increased response time. It is better to keep this answer to the point and as brief as possible.

This is a list of the most frequently asked questions in the interviews for LoadRunner job positions along with their best suitable answers. After refreshing your technical knowledge and going through this guideline, you would feel confident when you appear for the interview. Concentrate on the technical language and particular terminologies while answering and focus on those techniques which you master in. All the best!.

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