What is the difference between Overlay graph and Correlate graph?

LoadRunner FAQ

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40. What is the difference between Overlay graph and Correlate graph?

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.

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Other Interview Questions

• What is load testing?
• What is Performance testing?
• What is LoadRunner?
• What is Virtual Users?
• Using Windows Remote Desktop Connection
• Explain the Load testing process? Version 7.2
• When do you do load and performance Testing?
• What are the components of LoadRunner?
• What Component of LoadRunner would you use to record a Script?
• When do you do load and performance Testing?
• What are the components of LoadRunner?
• What Component of LoadRunner would you use to play Back the script in multi user mode?
• What is a rendezvous point?
• What is a rendezvous point?
• Explain the recording mode for web Vuser script?
• Why do you create parameters?
• What is correlation? Explain the difference between automatic correlation and manual correlation?
• How do you find out where correlation is required?
• Where do you set automatic correlation options?
• What is a function to capture dynamic values in the web Vuser script?
• VuGen Recording and Scripting?
• What is Scenarios ?
• When do you disable log in Virtual User Generator, When do you choose standard and extended logs?
• How do you debug a LoadRunner script?
• How do you write user defined functions in LR?
• What are the changes you can make in run-time settings?
• LoadRunner FAQ
• How do you perform functional testing under load?
• Using network drive mappings
• What is Ramp up? How do you set this?
• What is the advantage of running the Vuser as thread?
• If you want to stop the execution of your script on error, how do you do that?
• What is the relation between Response Time and Throughput?
• Explain the Configuration of your systems?
• How do you identify the performance bottlenecks?
• If web server, database and Network are all fine where could be the problem?
• How did you find web server related issues?
• How did you find database related issues?
• What is the difference between Overlay graph and Correlate graph?
• How did you plan the Load? What are the Criteria?
• What does vuser_init action contain?
• What does vuser_end action contain?
• What is think time? How do you change the threshold?
• What is the difference between standard log and extended log?
• What is lr_debug_message ?
• What is lr_output_message ?
• What is lr_error_message ?
• What is lrd_stmt?
• What is lrd_fetch?
• What is Throughput?
• Types of Goals in Goal-Oriented Scenario
• What is correlation? Explain the difference between automatic correlation and manual correlation?
• Where do you set automatic correlation options?