Imperva Performance Test Engineer Interview Questions and Answers

About work experience

Q1. Explain Performance Testing Life cycle
Ans. 
Performance Testing Life cycle involves planning, preparation, execution, analysis, and reporting.
• 1. Planning: Define objectives, select tools, and create test plan.

• 2. Preparation: Set up test environment, create test scripts, and configure monitoring.

• 3. Execution: Run tests, monitor performance metrics, and collect data.

• 4. Analysis: Analyze results, identify bottlenecks, and optimize performance.

• 5. Reporting: Generate...read more
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Q2. Explain correlation and Parameterization
Ans. 
Correlation is used to handle dynamic values in scripts, while Parameterization is used to pass different values to the script.
• Correlation is used to extract dynamic values from server responses and replace them in subsequent requests.

• Parameterization is used to pass different sets of data to the script for testing different scenarios.

• Correlation is important for maintaining session integrity and ensuring accurate test...read more
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Q1. Performing Testing Life Cycle
Ans. 
Testing Life Cycle involves planning, designing, executing, and analyzing tests to ensure software quality.
• Planning phase involves defining test objectives, scope, and resources.

• Design phase includes creating test cases, scripts, and data.

• Execution phase involves running tests and collecting results.

• Analysis phase includes reviewing results, identifying defects, and reporting.

• Iterative process to improve software quali...read more
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Q2. Correlation and Parameterization
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Q1. Explain Performance Testing Life Cycle
Ans. 
Performance Testing Life Cycle involves planning, preparation, execution, analysis, and reporting.
• 1. Planning: Define objectives, select tools, and create test plan.

• 2. Preparation: Set up test environment, create test scripts, and configure monitoring.

• 3. Execution: Run tests, monitor performance metrics, and collect data.

• 4. Analysis: Analyze results, identify bottlenecks, and optimize performance.

• 5. Reporting: Generate...read more
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Q2. Explain Correlation
Ans. 
Correlation is a technique used in performance testing to capture dynamic values and pass them between requests.
• Correlation is used to handle dynamic values like session IDs, timestamps, etc.

• It involves capturing a value from a response and passing it to a subsequent request.

• Common correlation techniques include using regular expressions or built-in functions in performance testing tools.

• Failure to correlate can lead t
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Q1. Difference between Lr_exit and Lr_abort
Ans. 
Lr_exit is used to end a Vuser script gracefully, while Lr_abort is used to forcefully terminate a Vuser script.
• Lr_exit is used when you want to end the script normally without any errors.

• Lr_abort is used when you want to forcefully stop the script execution due to an error or other condition.

• Lr_exit allows the script to finish executing any remaining actions before ending.

• Lr_abort immediately stops the script without ...read more
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Q2. How to remove trailing and leading spaces in Loadrunner
Ans. 
Use lr_trim_string function to remove trailing and leading spaces in Loadrunner
• Use lr_trim_string function to remove leading and trailing spaces

• Syntax: lr_trim_string("string", "both", " ")

• Example: lr_trim_string(" example ", "both", " ") will return "example"
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Q1. How does load generator works in LR?
Ans. 
Load generator in LR simulates virtual users to generate load on the application under test.
• Load generator simulates virtual users by sending requests to the application under test.

• It helps in generating load on the application to measure performance.

• Load generator can be configured to simulate different types of user behaviors and scenarios.

• It collects performance metrics and generates reports for analysis.

• Examples: J
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Q2. What is thoroughput?
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Throughput is the amount of data transferred successfully from one place to another within a given period of time.
• Throughput is a measure of the rate of successful data transfer.

• It is usually measured in bits per second (bps) or packets per second (pps).

• Higher throughput indicates better performance of the system.

• For example, in a network, throughput can be the number of packets successfully delivered from sender to re
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Q1. 1. What is sampler? 2. Throughput, rampup and rampdown? 3. what is post processor? 4. how can you perform correlation?
Ans. 
A sampler is a component in JMeter that sends requests to a server and records the response.
• Samplers are used to simulate user requests to a server

• Throughput is the number of requests per unit of time

• Rampup is the time taken to reach the desired number of users

• Rampdown is the time taken to bring down the number of users to zero

• Post processors are used to extract data from the response and store it for future use

• Correla...read more
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