Questions Commonly Posed in LoadRunner Interviews.
In our last guide, we covered all key points of Test Result Evaluation in LoadRunner.
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This post will concentrate on the most frequent inquiries and ideal responses in LoadRunner discussions. This set of queries will aid you in acing your LoadRunner performance tester interview.
LoadRunner is a top proprietary Performance Testing tool on offer. It caters to a broad variety of emerging technologies due to its support for numerous protocols.
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A few crucial prompts before we commence:
#1) Interview queries for LoadRunner can be divided into three core kinds – Scripting, Execution, and Evaluation. For beginners, the focus should be primarily on the scripting aspect.
#2) Http/HTML is the most extensively used protocol, therefore it’s recommended to acquire proficiency in this protocol to get started.
#3) You must be aware of the specific version of LoadRunner you’ve been called to work with. In case you’re experienced with an older version, be updated with the features of the latest/current iterations.
#4) Performance Testing discussions are more practical today. Rather than straightforward questions, queries rooted in real-life scenarios are typical. Some firms might include scripting exams as part of the interview procedure. So, get ready for that.
#5) When it comes to scripting, it is preferred if you can customize code instead of just recording and replaying it.
#6) Be prepared for queries related to think time, transactions, comments, recording preferences, runtime configurations, and so on. These inquiries aim to test your understanding of best scripting practices.
Below are some Performance Testing discussion queries that might demand some experience to answer. While working on your performance testing projects, bear these inquiries in mind to make the interview preparation an ongoing process.
- What sorts of obstacles have you encountered while scripting?
- What are the performance bottlenecks you have noticed in the projects you were part of? What recommendations did you propose to tackle those issues?
- Did you implement Little’s law in your project? If affirmative, how?
- What is your approach to evaluation?
- What do you monitor during execution?
- How do you obtain server data for test execution and analysis?
- How do you spot performance bottlenecks?
Primary areas of questioning:
- Challenges encountered during scripting
- Correlation function
- Error handling
- Different recording modes for Web HTTP/HTML protocol
- Scenario creation
- Challenges encountered during execution
- Evaluation
Here are some typical LoadRunner interview inquiries and their replies. However, remember that the ideal results are obtained by giving answers based on your experience, proficiency, and understanding of the concepts. Just memorizing replies is not always an effective strategy. Practice, study, and excel – that should be your method for performance testing interview preparation.
LoadRunner Discussion Queries and Perfect Answers
Q #1) What differentiates Performance Testing from Performance Engineering?
Reply: Performance Testing covers requirements gathering, scripting, execution, result discussion, and report creation in the testing cycle. Performance Engineering delves a step further, dissecting the execution results to find performance bottlenecks and giving solutions to rectify identified issues.
Q #2) Elucidate the Performance Testing Life Cycle.
Reply:
- Step 1: System Evaluation (Detecting crucial transactions)
Virtual User Generator - Step 2: Constructing Virtual User Scripts (Recording)
- Step 3: Specifying Users’ Behaviour (Runtime setting)
LoadRunner Controller - Step 4: Creating Load Test Scenarios
- Step 5: Running Load Test Scenarios and Observing Performance
LoadRunner Evaluation - Step 6: Inspecting the Results
For more comprehensive details, refer to Performance Testing Guide Series #2.
Q #3) What is Performance Testing?
Reply: Performance Testing is carried out to assess an application’s performance under load and stress circumstances. It is generally quantified in terms of the user action response time on an application.
Q #4) What is Load Testing?
Reply: Load Testing verifies whether an application can operate efficiently under heavy usage resulting from numerous users operating concurrently. The load is amplified to replicate the maximum load that servers will endure during peak usage times.
Q #5) What are the distinct components of LoadRunner?
Reply:
LoadRunner comprises the following primary components:
- VUGen: Records Vuser scripts that copy the actions of actual users.
- Controller: The control center for creating, sustaining, and managing load test scenarios. Delegates scenarios to Vusers and load generators, and starts and stops load tests.
- Load Generator: An agent designated to produce load.
- Evaluation: Delivers graphs and reports summing up system performance.
Q #6) What is a Rendezvous point?
Reply: A Rendezvous point is employed to replicate heavy user load (request) on the server. It commands Vusers to perform in unison. When a Vuser arrives at the Rendezvous point, it waits until the rest of the Vusers with the same Rendezvous point arrive. Once the designated number of Vusers reach the Rendezvous point, they are all released simultaneously. The function lr_rendezvous
is utilized to create a Rendezvous point. It can be introduced by:
- Logging the Rendezvous button on the floating Recording toolbar while recording.
- Embedding the Rendezvous point through Insert > Rendezvous after recording.
Q #7) What are the various sections in a script, and what order do they run in?
Reply: A LoadRunner script comprises three sections: Vuser_init, Action, and Vuser_end.
- Vuser_init: Carries requests/actions to log into the application/server.
- Action: Carries the actual code that tests the functionality of the application. It can be played back repeatedly in iterations.
- Vuser_end: Carries requests/actions to log out of the application/server.
The order in which these sections execute is as follows: the Vuser_init is executed at the start, succeeded by the Action section, and lastly, the Vuser_end section is executed at the conclusion.
Q #8) How do you determine which protocol to utilize for an application?
Reply: In the past, performance testers had to rely on the development team to understand the protocol employed by the application to interact with the server. Nonetheless, from version 9.5 onwards, LoadRunner offers a Protocol Advisor feature. The Protocol Advisor identifies the protocols utilized by the application and suggests potential protocols for creating a script to mimic real user behavior.
Q #9) What is Correlation? Explain the distinction between Automatic Correlation and Manual Correlation.
Reply: Correlation is used to tackle dynamic values in a script. Dynamic values may change for every user action (changes in value when action is replayed by the same user) or for different users (value changes when the action is replayed with a different user). Correlation guarantees these values are tackled correctly and do not lead to failures during execution.
When it comes to Manual Correlation, dynamic values are identified, and a correlation function (web_reg_save_param) is introduced manually before the request containing the first occurrence of the dynamic value in its response. On the other hand, Automatic Correlation depends on predefined correlation rules. The script is played