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Load Runner Interview Questions Answers

Load Runner Interview Question - 1 : -

Where do you set automatic correlation options?

Load Runner Interview Answer - 1 : -

Automatic correlation from web point of view, can be set in recording options and correlation tab. Here we can enable correlation for the entire script and choose either issue online messages or offline actions, where we can define rules for that correlation. Automatic correlation for database, can be done using show output window and scan for correlation and picking the correlate query tab and choose which query value we want to correlate. If we know the specific value to be correlated, we just do create correlation for the value and specify how the value to be created.
 

Load Runner Interview Question - 2 : -

Where do you set Iteration for Vuser testing?

Load Runner Interview Answer - 2 : -

We set Iterations in the Run Time Settings of the VuGen. The navigation for this is Run time settings, Pacing tab, set number of iterations.
 

Load Runner Interview Question - 3 : -

What is a function to capture dynamic values in the web vuser script?

Load Runner Interview Answer - 3 : -

Web_reg_save_param function saves dynamic data information to a parameter.
 

Load Runner Interview Question - 4 : -

What is correlation? Explain the difference between automatic correlation and manual correlation?

Load Runner Interview Answer - 4 : -

Correlation is used to obtain data which are unique for each run of the script and which are generated by nested queries. Correlation provides the value to avoid errors arising out of duplicate values and also optimizing the code (to avoid nested queries). Automatic correlation is where we set some rules for correlation. It can be application server specific. Here values are replaced by data which are created by these rules. In manual correlation, the value we want to correlate is scanned and create correlation is used to correlate.
 

Load Runner Interview Question - 5 : -

Explain the Configuration of your systems?

Load Runner Interview Answer - 5 : -

The configuration of our systems refers to that of the client machines on which we run the Vusers. The configuration of any client machine includes its hardware settings, memory, operating system, software applications, development tools, etc. This system component configuration should match with the overall system configuration that would include the network infrastructure, the web server, the database server, and any other components that go with this larger system so as to achieve the load testing objectives.
 

Load Runner Interview Question - 6 : -

What is the difference between Overlay graph and Correlate graph?

Load Runner Interview Answer - 6 : -

Overlay Graph: It overlay the content of two graphs that shares a common x-axis. Left Y-axis on the merged graph show’s the current graph’s value & Right Y-axis show the value of Y-axis of the graph that was merged. Correlate Graph: Plot the Y-axis of two graphs against each other. The active graph’s Y-axis becomes X-axis of merged graph. Y-axis of the graph that was merged becomes merged graph’s Y-axis.
 

Load Runner Interview Question - 7 : -

What is the difference between standard log and extended log?

Load Runner Interview Answer - 7 : -

The standard log sends a subset of functions and messages sent during script execution to a log. The subset depends on the Vuser type Extended log sends a detailed script execution messages to the output log. This is mainly used during debugging when we want information about: Parameter substitution. Data returned by the server. Advanced trace.
 

Load Runner Interview Question - 8 : -

What Component of LoadRunner would you use to play Back the script in multi user mode?

Load Runner Interview Answer - 8 : -

The Controller component is used to playback the script in multi-user mode. This is done during a scenario run where a vuser script is executed by a number of vusers in a group.
 

Load Runner Interview Question - 9 : -

What does vuser_init action contain?

Load Runner Interview Answer - 9 : -

Vuser_init action contains procedures to login to a server.
 

Load Runner Interview Question - 10 : -

How did you find web server related issues?

Load Runner Interview Answer - 10 : -

Using Web resource monitors we can find the performance of web servers. Using these monitors we can analyze throughput on the web server, number of hits per second that
occurred during scenario, the number of http responses per second, the number of downloaded pages per second.
 

Load Runner Interview Question - 11 : -

When do you do load and performance Testing?

Load Runner Interview Answer - 11 : -

We perform load testing once we are done with interface (GUI) testing. Modern system architectures are large and complex. Whereas single user testing primarily on functionality and user interface of a system component, application testing focuses on performance and reliability of an entire system. For example, a typical application-testing scenario might depict 1000 users logging in simultaneously to a system. This gives rise to issues such as what is the response time of the system, does it crash, will it go with different software applications and platforms, can it hold so many hundreds and thousands of users, etc. This is when we set do load and performance testing.
 

Load Runner Interview Question - 12 : -

What is Performance testing?

Load Runner Interview Answer - 12 : -

Timing for both read and update transactions should be gathered to determine whether system functions are being performed in an acceptable timeframe. This should be done standalone and then in a multi user environment to determine the effect of multiple transactions on the timing of a single transaction.
 

Load Runner Interview Question - 13 : -

How do you debug a LoadRunner script?

Load Runner Interview Answer - 13 : -

VuGen contains two options to help debug Vuser scripts-the Run Step by Step command and breakpoints. The Debug settings in the Options dialog box allow us to determine the extent of the trace to be performed during scenario execution. The debug information is written to the Output window. We can manually set the message class within your script using the lr_set_debug_message function. This is useful if we want to receive debug information about a small section of the script only.
 

Load Runner Interview Question - 14 : -

What is Ramp up? How do you set this?

Load Runner Interview Answer - 14 : -

This option is used to gradually increase the amount of Vusers/load on the server. An initial value is set and a value to wait between intervals can be specified. To set Ramp Up, go to ‘Scenario Scheduling Options’
 

Load Runner Interview Question - 15 : -

How did you find database related issues?

Load Runner Interview Answer - 15 : -

By running “Database” monitor and help of “Data Resource Graph” we can find database related issues. E.g. You can specify the resource you want to measure on before running the controller and than you can see database related issues