NashTech Senior Performance Test Engineer Interview Questions and Answers

Q1. All questions were real time question based on performance testing.
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Q2. In what case Jmeter takes more time than browser response time of a page.
Ans. 
Jmeter may take more time than browser response time due to network latency, server load, or Jmeter configuration.
• Network latency between Jmeter and server can cause delays.

• Server load may impact response time for Jmeter.

• Jmeter configuration settings like number of threads or ramp-up time can affect performance.

• Browser caching may make browser response time faster than Jmeter's.

• Complex scripts or heavy load scenarios c
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Q1. Loadrunner and jmeter related questions
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Q2. Basic loadrunner and jmeter settings property.
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Q1. Process of scripting and testing on loadrunner and jmeter.
Ans. 
Scripting and testing on LoadRunner and JMeter involves creating virtual users, recording scripts, parameterizing data, and executing tests.
• Create virtual users to simulate real-world user behavior

• Record scripts by capturing user actions and requests

• Parameterize data to create realistic test scenarios

• Execute tests to measure system performance and identify bottlenecks

• Analyze test results to identify performance issues
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Q1. What are your strengths and weaknesses?
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Q2. What are your salary expectations?
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Q3. Share details of your previous job.
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Q4. Why are you looking for a change?
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Q5. Tell me about yourself.
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Q1. Why did you use Jmeter?
Ans. 
I used Jmeter for its user-friendly interface, extensive features, and ability to simulate real-world scenarios.
• Jmeter has a user-friendly interface which makes it easy to create and execute performance tests.

• It offers a wide range of features for load testing, stress testing, and performance monitoring.

• Jmeter allows for the simulation of real-world scenarios, helping to identify performance bottlenecks and optimize sy...read more
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Q2. What is SLA in performance testing?
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SLA in performance testing refers to the agreed upon level of service that a system must meet in terms of response time, throughput, and other performance metrics.
• SLA stands for Service Level Agreement

• It defines the expected performance metrics that a system must meet

• SLAs are typically agreed upon between stakeholders and are used to measure the performance of a system

• Examples of SLAs include response time should be le...read more
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Q3. What is Correlation in Jmeter?
Ans. 
Correlation in JMeter is the process of extracting dynamic values from server responses and passing them as inputs to subsequent requests.
• Correlation is important in performance testing to simulate real user behavior.

• It involves identifying and capturing dynamic values like session IDs, tokens, etc.

• These values are then extracted using regular expressions or built-in JMeter functions.

• The extracted values are stored in ...read more
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Q4. How many types of listeners did you use
Ans. 
I used multiple types of listeners including JMeter listeners, PerfMon Metrics Collector, and InfluxDB Backend Listener.
• JMeter listeners

• PerfMon Metrics Collector

• InfluxDB Backend Listener
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Q5. What is parameterization?
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Parameterization is the process of replacing hard-coded values in a test script with variables to make the script more dynamic and reusable.
• Parameterization helps in simulating real-world scenarios by varying input data during test execution.

• It allows for running the same test script with different sets of data without the need to modify the script each time.

• Common examples of parameterization include using CSV files, ...read more
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Q6. What are threads and thread groups?
Ans. 
Threads are lightweight processes within a process that can run concurrently. Thread groups are a collection of threads.
• Threads are independent sequences of execution within a process.

• Thread groups are used to organize and manage multiple threads together.

• Threads within a group can share resources and communicate with each other.

• Example: In performance testing, threads can simulate multiple users accessing a system con
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Q1. Why PT required?
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Q2. Performance testing procedures for API
Ans. 
Performance testing procedures for API involve load testing, stress testing, and scalability testing.
• Conduct load testing to determine how the API performs under normal and peak load conditions.

• Perform stress testing to evaluate the API's stability and reliability under extreme conditions.

• Conduct scalability testing to assess the API's ability to handle increased workload by adding more resources.

• Monitor response times...read more
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Q3. APM tool use in PT?
Ans. 
APM tools are commonly used in Performance Testing to monitor and analyze the performance of applications under load.
• APM tools help in identifying performance bottlenecks and optimizing application performance.

• Examples of popular APM tools include New Relic, Dynatrace, AppDynamics, and Datadog.

• These tools provide real-time monitoring, alerting, and performance analytics to help improve application performance.

• APM tools...read more
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Q4. Root Cause analysis in PY
Ans. 
Root Cause analysis in PY involves identifying the underlying reason for performance issues.
• Identify the symptoms of the performance issue

• Gather data and metrics related to the performance problem

• Analyze the data to pinpoint the root cause

• Implement solutions to address the root cause
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About work experience

Q1. Asked some performance basics to advanced level questions, somecoding questions.
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Q2. What is PTLC in testing?
Ans. 
PTLC stands for Performance Testing Life Cycle, which is a process followed in performance testing to ensure the performance of a system.
• PTLC involves planning, preparation, execution, and analysis of performance tests.

• It includes defining performance goals, creating test scenarios, executing tests, and analyzing results.

• PTLC helps in identifying performance bottlenecks and optimizing system performance.

• Example: In PTL...read more
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Q3. Make a python script that captures resources of a system.
Ans. 
Python script to capture system resources
• Use psutil library to access system resources

• Collect CPU, memory, disk, and network usage data

• Display the captured resources in a readable format
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Q4. What is network bandwidth constraint in testing?
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Network bandwidth constraint in testing refers to limitations on the amount of data that can be transmitted over a network during testing.
• Network bandwidth constraint can impact the performance of an application or system being tested.

• It can lead to slow response times, timeouts, or even failures during testing.

• Examples of network bandwidth constraints include limited bandwidth on a shared network, network congestion, ...read more
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Q5. What is use of timers in JMeter?
Ans. 
Timers in JMeter are used to simulate real user behavior by adding delays between requests.
• Timers help in controlling the load on the server by adding delays between requests.

• They can be used to simulate realistic user behavior by adding random or constant delays.

• Examples of timers in JMeter include Constant Timer, Gaussian Random Timer, and Uniform Random Timer.
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Q1. What is the performance testing
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Performance testing is a type of testing to ensure software applications perform well under expected workload.
• Performance testing evaluates the speed, responsiveness, and stability of an application under various load conditions.

• It helps identify bottlenecks, performance issues, and areas for improvement in the application.

• Types of performance testing include load testing, stress testing, and scalability testing.

• Tools ...read more
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Q2. What is the correlation
Ans. 
Correlation is a statistical measure that describes the strength and direction of a relationship between two variables.
• Correlation values range from -1 to 1, with 0 indicating no correlation, 1 indicating a perfect positive correlation, and -1 indicating a perfect negative correlation.

• Positive correlation means that as one variable increases, the other variable also increases. Negative correlation means that as one var...read more
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Q3. Performance testing is used for checking the application behavior in terms of speed stability and scalability under various of work load
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Q4. Correlation : Means replacing dynamic value by a parameter.In Correlation handling Dynamic Data generated by Server side.
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Q1. Load runner related
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Q2. What is correlation
Ans. 
Correlation is a statistical measure that describes the relationship between two variables.
• Correlation can range from -1 to 1, with 1 indicating a perfect positive correlation, -1 indicating a perfect negative correlation, and 0 indicating no correlation.

• Correlation does not imply causation, meaning just because two variables are correlated does not mean that one causes the other.

• For example, if there is a positive cor...read more
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