Here are some key questions and answers for LoadRunner interviews. These Load Runner Interview Questions and Answers might help you prepare for a job interview. Preparing for a LoadRunner interview might be challenging; but, by reading through typical questions, you can have a good idea of what the interviewer might ask.
Theoretical and fundamental aspects of application configuration and usage are generally the subject of LoadRunner interview questions. Knowing how to respond to them correctly is the key to acing the interview you are preparing for. You will most likely be asked questions about your role in performance testing rather than anything else. So, focus mainly on configuration and usage of the application alongside some theoretical answers.
LoadRunner Interview Questions With Sample Answers
What is the difference between different forms of performance testing?
Any web application’s performance under load and stress is certified through performance testing. Typically, we evaluate a system’s performance in terms of how quickly it responds to user input. Begin in a single-user mode and progress to a multi-user environment, observing the effect of numerous transactions vs. a single transaction.
There are several types of performance testing.
- Load: To see if an application can handle the spikes in traffic caused by a large number of concurrent users and transactions.
- Stress: To investigate how an application behaves during peak demand times.
- Capacity: To evaluate when unsatisfactory response times occur by measuring total capacity.
What are the most common solutions for performance testing?
- HP LoadRunner – It’s intended for use on the web and in other apps. It can run on several platforms, databases, and application settings. It may use a large number of server monitors to track bottlenecks and assess the performance of each component.
- QAload(Compuware) – It’s mostly used for Web, database, and char-based system load testing.
- WebLoad(RadView) – Allows you to compare the results of running tests to test metrics.
- Rational Performance Tester (IBM) – This tool is used to determine the presence and source of performance bottlenecks in systems.
What is a load runner, and what kinds of tests can it run?
HP’s Load Runner is a performance-testing software. All elements of load, stress, endurance, spike testing, and data volume are supported by this program.
What are Load Runner’s major components?
- Virtual User Generator – End-user business operations are captured, and Vuser scripts, which are automated performance testing scripts, are generated.
- Controller – In charge of organizing, driving, managing, and monitoring the load test.
- Load generators – Runs Vusers to generate the load.
- Analyzer – Aids in viewing, dissecting, and comparing performance data.
- Launcher – provides a centralized location for all LoadRunner components.
What is the difference between Vusers and Vuser scripts?
Vusers utilize the program in the same way as a human would. And interact with the program in the same way that a human would. Many Vusers can operate on a single workstation at the same time while workstations only allow for one human user.
Vuser script is the script that records all of the Vuser’s activities to accomplish the task. When we execute a scenario, each Vuser runs a Vuser script. The Vuser script also includes a method for monitoring the application’s performance.
Give an example of a rendezvous point.
Rendezvous points are used to simulate a high amount of user traffic on the server. They tell Vusers to wait during test execution so that multitasking is possible. In an e-commerce platform, for example, rendezvous points are introduced to allow 1000+ people to bid on a product at the same time.
Why should Vuser be run as a process rather than a thread?
Vuser loads a copy of the driver software into memory for each request when it is executed as a process. This necessitates a lot of memory, and the number of Vusers on a single generator is limited. When Vuser is executed as a thread, a single instance of the driver program allows many Vusers to run simultaneously.
What does throughput mean, and how does it relate to response time?
The number of transactions created overtime during a test is referred to as throughput. It’s also referred to as the maximum capacity of a website or application.
When we compare it to response time, we can see that both of them are decreasing at the same time. Similarly, the maximum throughput and response time occur at around the same time.
What are the various sorts of vUser logs and what are the distinctions between them?
There are two sorts of vUser logs in LoadRunner: regular and extended logs. A subset of functions and messages are redirected to the output log by standard log. The subset of functions available is determined by the Vuser type.
The expanded log, on the other hand, records specific execution messages in the output log. It’s typically utilized when the user wants some parameter replacement debugging information.
In LoadRunner, how do you define think time?
The user delay between two successive requests is represented by think time.
For example, suppose a user opens to page 1 and begins filling out the data on that page. Assume the user filled out the data in 10 seconds. He then submitted page 1, which was then loaded. The user has delayed 10 seconds between pages 1 and 2 in this example. As a result, the thought time here is 10 seconds.
What does the term “correlation” mean? Also, draw attention to the automated association.
To avoid failure, correlation is a technique in which dynamic values are retrieved at run-time rather than hard-coded in your script. For each user activity or for various users, the dynamic value might change. Correlation takes care of these numbers in both situations. It also keeps them from failing during the execution.
Automated correlation follows a set of established rules. If the script fails, it is replayed and checked for auto-correlation. Vugen locates the location where the correlation rules are in effect and correlates the value upon approval.
What should be correlated and what should be parameterized?
Correlation is required for every value in the script that varies with each repetition or with various users when replaying. Any user input that occurs throughout the recording process should be parameterized.
What is parameterization, and why does it matter in a script?
Parameterization is the process of replacing hard-coded data in a script with variables. This allows a single virtual user (i.e. vuser>) to run with new data each time. This replicates real-world application usage by preventing the server from caching responses.
In LoadRunner, what is the difference between a transaction and a transaction instance?
A transaction is a way to keep track of how long it takes for particular statements to execute. For performance analysis, a transaction instance is employed.
How can you figure out where the bottlenecks are in terms of performance?
Performance Monitors can be used to detect bottlenecks.
- Application server monitors, database server monitors, web server monitors, and network monitors are examples of these monitors.
- They assist in identifying the problematic region in our case, which results in a longer reaction time.
- Performance response time, throughput, hits/sec, network latency graphs, and other metrics are commonly used.
What role do checkpoints play in LoadRunner?
When performing a test, it’s often necessary to double-check if the requested material is available on the result page. A content check verifies that the Web page has the requested information. In LoadRunner, there are two sorts of content checks.
- Text Check – Confirm that a text string displays on a web page with a text check.
- Image Checks – Confirm that an image renders correctly on a web page.
What’s the point of keeping an extended log?
- Any advanced traces that are accessible, as well as the data returned by the server.
- Substitution of parameters
- Other information is dependent on the parameters you choose in LoadRunner.
This article on LoadRunner Interview Questions aims to help you understand the most essential questions asked to prepare for an interview. For your convenience, all of the key LoadRunner questions are addressed in detail with examples. You may use these questions to analyze your abilities and see where you need to improve.
LoadRunner vs. JMeter: Which is Better?
When compared to LoadRunner, JMeter has a lower performance. This program can detect small defects and dangers, however, it is ineffective in detecting risks in large-scale applications. When compared to JMeter software, the LoadRunner is more efficient and faster in detecting the bugs present in the application.
Is HP LoadRunner available for free/ free of cost?
You may create scripts and test the performance of your application for up to 50 users for free. LoadRunner Community Edition allows system administrators to offer enterprise-level quality performance testing to the IT department fast and simply without compromising for a lower product.
How do you put LoadRunner to the test?
One of the most common load testing applications is Micro Focus LoadRunner (formerly HP). It’s used to load test an application’s performance. It can produce real-time load transactions and assess the results by simulating thousands of concurrent users.