Top 20 Loadrunner interview questions Must read

  1. What is the purpose of LoadRunner?  LoadRunner allows you to perform automated performance testing on software. It lets you apply expected production workloads onto an application. This testing includes measuring performance and the user’s experience. It tests response speed, load handling and stability.
  2. 2.       How does LoadRunner handle multiple-user tests?  With a fully licensed version of LoadRunner you can use as many virtual users (Vusers) as you need. This number would be proportional to the number of concurrent users in the business’ usage.
  3. 3.      What is the Controller?  This is the main screen from which you create and edit scripts for testing. Then you can run the test from the Controller.
  4. 4.      What are monitors?  LoadRunner offers a variety of ‘monitors’ so you can watch the test as it runs, to see where potential bottlenecks are. These monitors are set up for different back-end servers, such as CRM, ER, the Web, networks and databases. The Controller displays a Windows Resources graph, which needs to be configured by the tester. There are also graphs to monitor hits per second, Vusers (virtual users) and transaction response time.
  5. 5.      What is VuGen?  This is the virtual user generator. When you script a test, the actions are recorded into a blank Vuser script. VuGen has a wizard to help you create the Vuser script. Once the script is configured, you can view the real-user emulation for tweaking. You then create the runtime behavior of the user, the number of times to be played, and the time between runnings. You then run the script in the background or view it in real time. The wizard also enables you to view information about the replay.
  6. 6.      What happens once the replay is run?   VuGen will display the test results. You can then search the results to determine if the script reached the intended goals. You can filter and search to find points of failure. Once you are sure the Vuser script is right, you can add variables, options for how a Vuser will act.
  7. How do I test a multiple-user environment?  Working in the Controller, select a manual scenario. Define the number of Vusers will be involved and the times they run. Then add a load generator. Configure the load behavior and run the load test.
  8. What is a goal-oriented scenario?  This is used when you want to check if an application can meet the performance levels that have been set. This is done by defining metrics to be achieved – the number of transactions per second, hits per second and so on. To do this, you set goals for the test, configure how and when the Controller should reach the target, and determine the load behavior. Start the scenario. You can monitor the metrics while it runs. You can then analyze the results.
  9. What is involved in the analysis?  By looking at the resultant graphs you can find out if any failures occurred and how many; you can find out how well your server performed; you can find out if goals were met and how many times. You can correlate data and filter data to clarify the results. You can report your findings in HTML or Microsoft Word.
  10. What are some of the general goals we should be aiming for?  Will the users have a positive experience on rollout? Does the application respond fast enough? Is the application stable under different kinds of loads? Will the application handle the anticipated loads and more? Will the application handle the number of transactions the user wants?

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