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HP LoadRunner Questions Bank-Q 21 to 30

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HP LoadRunner Questions Bank: Q. 21 to 30

Learn "Controller" Module of HP – LoadRunner through FAQ’s:

Q. 21: How do we measure the system capacity?

We measure system capacity to find out how much excess capacity the system can handle without any degradation in its performance .

For checking the capacity of a system, we compare the performance versus load on the existing system, and find out a point at which significant degradation of response-time starts taking place. Point is known as "knee" when plotted over a response time curve.

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Q. 22: What is the purpose of creating Scenarios in LoadRunner?

For testing a system by using LoadRunner, we need to create a scenario. Scenario is a file containing

complete information about the testing session. The scenario is a means of emulating a real-life user.

The scenario contains following information about the mechanism of emulating the real users:

1) Details of groups of virtual users or Vusers.

2) Details of test scripts the Vusers will run.

3) Details of load generators upon which the scripts shall be made to run.

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Q. 23: How many types of scenarios can be created while using Controller of LoadRunner?

We can create any one type of scenario out of the following:

1) Manual Scenario: Scenario is created manually by defining the number of Vuser groups we want to run, and building a schedule for LoadRunner to run these groups. Manual scenario can be created by defining the total number of Vusers to be used in the scenario, or assigning a percentage of the total number of Vusers to each script.

2) Goal-Oriented Scenario: We define the goals that we want to achieve in our test and LoadRunner automatically builds a scenario for us, based upon our goals.

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Q. 24: How can we change the maximum number of scripts displayed in the Available Scripts list?

We can change the maximum number of scripts displayed in the Available Scripts list by modifying the registry key:

HKEY_CURRENT_USERSoftwareMercury InteractiveRecentScriptsmax_num_of_scripts

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Q. 25: What is the purpose of Scenario Files?

A scenario provides detailed description of various events taking place during every load testing session.

A scenario is created by using the Design view of Controller in LoadRunner. Once a scenario is created, LoadRunner saves the information in a

scenario file having an extension (*.lrs).

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Q. 26: What methods are available in LoadRunner for building scenarios?

Two methods are available through which we can create scenarios.

1) Manual Scenario creation method: Involves creating groups and specifying the script, the load generator, and the number of Vusers included in each group. We can chose to opt for using Percentage Mode to distribute our Vusers among various scripts.

2) Goal Oriented Scenario creation method: Involves defining the goals we want our test to achieve, and LoadRunner automatically builds a scenario for us, based on these goals.

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Q. 27: How can we change the maximum number of scripts displayed in the Available Scripts list?

We can change the maximum number of scripts displayed in the Available Scripts list by modifying the registry key:

HKEY_CURRENT_USERSoftwareMercury InteractiveRecentScriptsmax_num_of_scripts

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Q. 28: What is the purpose of having Vuser groups in scenarios?

A scenario consists of groups of Vusers which simulate the actions of human users on the application under test. When a particular scenario is run, the Vusers generate load on the server, and LoadRunner monitors the server and transaction performance..

Vuser groups are created to organize several Vusers in a scenario into manageable groups. Vuser groups are created by including Vusers having similar characteristics. For example, when many Vusers run the same Vuser script, we can club them into one Vuser group.

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Q. 29: What type of actions can be performed on a Vuser group or scenario?

Following actions can be performed on a Vuser group:

1) Defining the group name, Vuser quantity, load generators, and scripts for the Vuser group.

2) Adding load generators to the Vuser group and configuring the load generators.

3) Adding and configuring scripts to the Vuser group.

4) Enabling or disabling a Vuser group for the scenario.

5) Removing a Vuser group from the scenario.

6) Scheduling the Vuser group execution.

7) Defining service level agreements for the scenario.

8) Running, stopping & resetting the scenario.

9) Configuring the settings of scenario results.

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Q. 30: What is the meaning of pending status for a Vuser?

Pending status for a V user indicates that the Vuser is ready to be initialized and is waiting for an available load generator, or is transferring files to the load generator. The Vuser will run when the conditions set in its scheduling attributes are met.

Continue to Next Part : Q 31 to 40 

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