Top 25 HP LoadRunner Interview Questions and Answers

Q1. What is the difference between risk and failure?

Risk is potential problem that has not yet occurred but is likely to happen and that may cause the failure of the software product.
Failure for the end user is deviation of the component or system from its expected delivery or expected product.

Q2. What are different components of Load Runner tool?

Load runner has following components:

Vugen: Vugen is used to create the automated performance scripts.
Controller: It is used to organize, drive, manage and monitors the load tests.
Analysis: It helps us to view and compare the test results.
Load Generators (LG): It is the component which is responsible to generate and run the Vusers to put load on the system.

Q3. What is correlation and how do you find it?

Correlation is used to find out the data which is unique for every run such as session ids, or unique ids which change every time we perform the step. They can be found out by comparing the same scripts manually or automatically in Load runner

Q4. How many sections are there in load runner vugen?

There are basically 3 sections:

  • Vuser_init: At this section, the starting transactions such as login etc is defined.
  • Action: this lists all the actions performed.
  • Vuser_end: at this section, we define the logout or closing functions.

Q5. How many logging options are available in load runner and when do we use them?

    • Standard Log Option: When you select Standard log, it creates a standard log of functions and messages sent during script execution which can be used for debugging. Disable this option for large load testing scenarios. When you copy a script to a scenario, logging is automatically disabled.
    • Extended Log Option: Select extended log to create an extended log, including warnings and other messages. Disable this option for large load testing scenarios. When you copy a script to a scenario, logging is automatically disabled. We can specify which additional information should be added to the extended log using the extended log options.

Q6. What do you mean by scenario in load runner?

A scenario defines the events that occur during each testing session. For example, a scenario defines and controls the number of users to emulate, the actions to be performed, and the machines on which the virtual users run their emulations.

Q7. How you can capture the dynamic value in load runner, explain the function used?

We can capture the dynamic value by “web_reg_save_param” function. The syntax for the function is “web_reg_save_param (“ID1Value”, “LB= value=\””, “RB=\””, “Ord=1”, LAST);” if you specify ORD= ALL it will takes all the values and form an array

Q8. What does lr_abort function do in HP Load Runner?

It aborts the execution of script and end the execution if any error occurs. For this we need to uncheck continue on error in runtime settings.

Q9. Have you ever handled a “captcha”? What are the challenges you faced?

Captcha can’t be detected by load runner so in need to handle that we can ask the dev to disable the functionality or to make it static value. Another way is to send the captcha value in response so that we can correlate it.

Q10. What is the use of “lr_paramarr_random” function and where we use it?

This is used to pass random values in any code where the values are captured by ordinal all function.

Q11. What is the extension of scenario file in load runner?

It is saved as .lrs.

Q12. How many check points are available in LoadRunner?

We have mainly 2 check points:

  • Image Check
  • Text Check

Q13. How to create monitor in Load Runner?

  • On My Performance Center navigation bar, select Resources > Test Resources.
  • Click New Monitor Profile. The Create New Monitor Profile dialog box enables you to add a new monitor profile.
  • In the Monitor Profile page, click Add Monitor button. Select monitor in Add New Monitor page.
  • In the Edit Monitor dialog box, enter the required information and select the counters that you want to monitor. The Edit Monitor page varies depending on monitor type you select.

Q14. What is the difference between HTML and URL based recording in LoadRunner?

HTML level will generate a web_submit_form statement that only records options an end user is allowed to see and change.
URL level will generate a web_submit_data statement that records all data that was actually sent from the browser to the server.

Q15. What is 90% in Load Runner report?

If you arrange 100 response times from good to bad i.e. in ascending order. The 90 percentile response time is the 90th response time. So, if 90th response time is in the acceptable range, we can say 90 out of 100 response times are in the acceptable range. Other 10 might be in the acceptable range or may not.

Q16. If a page has 5 products and you have 5 virtual users, how will you perform click on one product??

We can parameterize 5 links with sequential iteration, So that each virtual user picks one link sequentially and executes it.

Q17. What is goal oriented scenario? What goals can be achieved through it?

Load Runner provides you with five different types of goals in a goal oriented scenario:

  • Number of Virtual Users
  • Hits per second
  • Transactions per second
  • Pages per minute
  • Transaction response time

Q18. Tell any default monitoring tool which comes with windows?

“Perfmon” is a default monitoring tool which is inbuilt in all windows system which can be called by typing “perfmon” in run.

Q19. Where do you set automatic correlation options?

Automatic correlation from web point of view can be set in recording options and in correlation tab. We can enable correlation for the entire script and choose either online messages or offline actions where we can define rules for that correlation.

Q20. Have you worked on user defined functions in LoadRunner? How can we create them?

Before we create the User Defined functions, we need to create the external library (DLL) with the function. We add this library to VuGen bin directory. Once the library is added, we assign user defined function as a parameter. The function should have the following format: __declspec (dllexport) char* (char*, char*)\.

Q21. How can you debug a Load Runner script?

VuGen contains two options to debug Vuser scripts:

  • Run Step by Step command.
  • Putting breakpoints in a script.

We can also manually set the message class within the script using the lr_set_debug_message function.

Q22. What changes can you make in run time settings of Load Runner?

There are four run-time settings that can be done:

  • Log: Logging can be set to standard or disabled.
  • Pacing: This contains iteration count.

Q23. Name different selection methods while selecting data from a file in Load Runner?

It can be done in 4 ways:

  • Sequential
  • Random
  • Unique
  • Parameter Name.

Q24. How can we find out database issues in our application?

Data resource graphs and monitors can be used to determine any such issue in database. In LoadRunner, we can specify the resource which needs to be measured before the controller runs.

Q25. What type of graphs available in Load Runner?

There are following types of graphs:

  • Network delay time graph
  • Transaction response time graphs
  • Hits/second graph
  • Pages download/second Graph.

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