Interview Questions.

Question 1. What Is Jmeter?

Answer :

JMeter is one of the Java gear that is used to carry out load trying out customer/server programs. Apache JMeter is open supply software program, a 100% natural Java desktop software designed to load check functional conduct and measure overall performance of the utility. It was in the beginning designed for trying out Web Applications but has on account that increased to other test features.

Question 2. Explain How Jmeter Works?

Answer :

JMeter acts like a collection of users sending requests to a target server. It collects response from target server and different facts which display the performance of the software or server via graphs or tables.

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Question 3. Explain Where You Can Use Functions And Variables?

Answer :

Variables and capabilities can be written into any subject of any take a look at element.

Question four. Mention What Are Regular Expressions In Jmeter?

Answer :

Based at the pattern, normal expression are used to look and manage text. JMeter is useful in interpreting varieties of normal expression or styles being used at some stage in a JMeter test plan.

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Question 5. Explain What Is Samplers And Thread Groups?

Answer :

Thread organization: For any take a look at plan, JMeter is the beginning a part of thread institution factors. It is an critical detail of JMeter, in which you could set variety of customers and time to load all of the customers given in the thread group

Samplers: Sampler generates one or greater pattern effects; those pattern results have many attributes like elapsed time, data length, and many others. Samplers allow JMeter to send precise forms of requests to the server, thru samplers, thread group comes to a decision ?which sort of request it need to make. Some of the useful samplers are HTTP request, FTP request, JDBC request and so forth.

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Question 6. Whether The Test Plans Built Using Jmeter Are Os Dependent?

Answer :

Usually, test plan are stored in their XML layout, so there's not anything to do with any precise O.S. It may be run on any OS where JMeter can run.

Question 7. Mention What Are The Types Of Processor In Jmeter?

Answer :

The varieties of processor in JMeter are:

Pre-processor
Post processor
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Question 8. Explain What Are Pre-processor Elements? List Some Of The Pre-processor Elements?

Answer :

A pre-processor is some thing as a way to show up before sampler executes. To configure the sample request prior to its execution or to replace variables that are not extracted from reaction textual content pre-processor factors are used.

Some of the pre-processor elements are:

HTTP URL re-writing modifier
HTTP person parameter modifier
HTML hyperlink parser
BeanShell PreProcessor
Question nine. Mention The Execution Order Of Test Elements?

Answer :

The check plans factors execution order is

Configuration elements
Pre-processors
Timers
Samplers
Post-processors
Assertions
Listeners
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Question 10. What Does “comprise” And “fits” Indicates In The Regular Expression?

Answer :

In the ordinary expression, carries suggests that the ordinary expression matched at least a few a part of the goal. While fits method the regular expression matched the entire goal. So, ‘alphabet’ is “matched” by way of ‘al.*t.’

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Question 11. Explain What Is Configuration Elements?

Answer :

A configuration element works parallel with a Sampler. To set up defaults and variables for later use through samplers configuration elements may be used. At the begin of the scope, these factors are processed earlier than any samplers inside the identical scope.

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Question 12. Explain What Is A Timer In Jmeter And What Are The Types Of It?

Answer :

A JMeter thread by way of default will send requests constantly with none pause. To get a pause between the request, Timers are used. Some of the Timers used are Constant Timer, Gaussian Random Timer, Synchronizing Timer, Uniform Random Timer and so forth.

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Question thirteen. Explain What Is Test Fragment?

Answer :

Test fragment is also a form of detail like Thread Group element. The most effective distinction is test fragment isn't carried out until it's miles referenced with the aid of both a Module controller or an Include controller.

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Question 14. Explain What Is Assertion In Jmeter? What Are The Types Of Assertion?

Answer :

Assertion allows to verify that your server below check returns the anticipated results

Some normally used Assertion in JMeter are

Response Assertion
Duration Assertion
Size Assertion
XML Assertion
HTML Assertion
Question 15. Explain How You Can Reduce The Resource Requirement In Jmeter?

Answer :

To reduce the aid requirements in JMeter

Use non-GUI mode: jmeter –n –t test.Jmx –l take a look at.Jtl
During the weight, check doesn’t use “view effects tree” or “view outcomes in table” listeners, use them simplest at some point of scripting phase
Don’t use useful mode
Instead of the use of masses of comparable samplers, use the same sampler in loop and use variable to vary the sample
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Question 16. Explain How You Can Perform Spike Testing In Jmeter?

Answer :

By synchronizing, timer JMeter spike trying out can be finished. Synchronizing timer, blocks thread until a particular amount of threads has been blocked after which launch all of them collectively as a result growing huge immediate load.

Question 17. Explain How You Can Capture The Script Of The Authentication Window In Jmeter?

Answer :

Normally, you may seize script with the aid of recording.

First you need to Threadgroup in Testplan after which make HTTPProxyServer in Workbench
After that, set port wide variety in Global Setting field (e.G., 8911) and modify your connection placing in IE as local host in address 8911 as in port Then you may start http proxy server in JMeter and run your utility for login.
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Question 18. List Out Few Jmeter Listeners?

Answer :

Some of the JMeter Listeners are:

Spline Visualizer
Aggregate Report
View Result Tree
View Result in Table
Monitor Results
Distribution Graph
BeanShell Listener
Summary Report and so on
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Question 19. What Is Distributed Load Testing? How It Can Be Achieved?

Answer :

Distributed load checking out is the process through which severa systems can be used for simulating load of a big variety of customers. By the usage of the master-slave configuration, JMeter can do distribute load trying out.

Question 20. In Jmeter Is It Necessary To Call Embedded Resources Explicitly?

Answer :

You can put off all embedded assets from being explicitly referred to as. Requests have a checkbox at the lowest that asserts “retrieve embedded resources.” It might seize all CSS, JPG, and so on. It is a exceptional way to locate sources and damaged hyperlink in a web App.

Performance Testing Interview Questions
Question 21. Explain What Is The Role Of Timer In Jmeter?

Answer :

With the help of timer, JMeter can postpone the time between each request, which a thread makes. It can solve the overload problem of the server.

Question 22. Explain What Is Post-processor?

Answer :

To carry out any motion after creating a request, Post- processor is used. For instance, if JMeter sends an http request to the web server, and if you need JMeter to stop sending the request if the web server shows an blunders, then you may use post-processor to perform this motion.

Question 23. What Are The Benefits That Jmeter Offers For Performance Testing?

Answer :

JMeter offers blessings on performance testing like

It can be used to check performance for both, static resources in addition to dynamic resources
It can cope with a most range of concurrent users then your internet site can cope with
It gives the graphical analyses of performance reports
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Question 24. What Are The Protocols Supported By Jmeter?

Answer :

The protocols supported via JMeter are:

Web: HTTP, HTTPS websites 'net 1.Zero' web 2.0 (ajax, flex and flex-ws-amf)
Web Services: SOAP / XML-RPC
Database via JDBC drivers
Directory: LDAP
Messaging Oriented provider via JMS
Service: POP3, IMAP, SMTP
FTP Service
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Question 25. List Some Of The Features Of Jmeter.?

Answer :

Following are some of the functions of JMeter:

Its loose. Its an open supply software.
It has easy and intuitive GUI.
JMeter can load and performance take a look at many different server types: Web - HTTP, HTTPS, SOAP, Database via JDBC, LDAP, JMS, Mail - POP3
It is platform-independent device. On Linux/Unix, JMeter can be invoked by using clicking on JMeter shell script. On Windows it could be invoked via starting the jmeter.Bat report.
It has complete Swing and lightweight component support (precompiled JAR uses packages javax.Swing.* ).
JMeter keep its test plans in XML layout. This way you could generate a take a look at plan the use of a text editor.
It's complete multi-threading framework allows concurrent sampling by many threads and simultaneous sampling of different functions by means of separate thread businesses.
It is relatively Extensible.
Can additionally be used to perform automatic and useful checking out of your software.
Question 26. What Is A Test Plan In Jmeter?

Answer :

A Test Plan defines and affords a format of how and what to check. For example the web software as well as the customer server software. It may be regarded as a field for walking exams. A complete take a look at plan will consist of one or more elements consisting of thread businesses, common sense controllers, sample-generating controllers, listeners, timers, assertions, and configuration elements. A test plan must have at least one thread institution.

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Question 27. List Some Of The Test Plan Elements In Jmeter.?

Answer :

Following is a list of a number of the check plan factors:

ThreadGroup
Controllers
Listeners
Timers
Assertions
Configuration Elements
Pre-Processor Elements
Post-Processor Elements
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Question 28. What Is Thread Group?

Answer :

Thread Group factors are the beginning points of your take a look at plan. As the name suggests, the thread group factors manipulate the quantity of threads JMeter will use at some point of the take a look at.

Question 29. What Are Controllers And Its Types?

Answer :

JMeter has two types of Controllers:

Samplers Controllers : Samplers allow JMeter to send particular types of requests to a server. They simulate a person's request for a page from the target server. For instance, you can upload a HTTP Request sampler in case you want to carry out a POST, GET, DELETE on a HTTP provider

Logical Controllers : Logic Controllers can help you control order of processing of Samplers in a Thread. Logic Controllers can trade the order of request coming from any in their child factors. Some examples are: ForEach Controller, While Controller, Loop Controller, IF Controller, Run Time Controller, Interleave Controller, Throughput Controller, Run Once Controller.

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Question 30. What Is Configuration Element?

Answer :

Configuration Elements permit you to create defaults and variables to be used by Samplers. They are used to add or alter requests made by way of Samplers.

They are finished on the begin of the scope of which they're component, earlier than any Samplers which are located inside the equal scope. Therefore, a Configuration Element is accessed best from in the department where it's miles located.

Question 31. What Are Listeners?

Answer :

Listeners can help you view the effects of Samplers inside the shape of tables, graphs, bushes or easy textual content in some log files. They offer visible get right of entry to to the information amassed through JMeter about the check instances as a Sampler element of JMeter is done.

Listeners can be introduced everywhere within the check, which includes immediately under the check plan. They will accumulate facts most effective from factors at or beneath their degree.

Question 32. What Are Pre-processor And Post-processor Elements?

Answer :

A Pre-Procesor is some thing so as to show up before a sampler executes. They are regularly used to adjust the settings of a Sample Request simply before it runs, or to replace variables that aren't extracted from reaction textual content.

A Post Processor executes after a sampler finishes its execution. This detail is most often used to procedure the response information, for example, to retrieve particular price for later use.

Question 33. What Is The Execution Order Of Test Elements?

Answer :

Following is the execution order of the test plan factors:

Configuration elements
Pre-Processors
Timers
Sampler
Post-Processors (except SampleResult is null)
Assertions (unless SampleResult is null)
Listeners (except SampleResult is null)
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Question 34. How Do You Ensure Re-usability In Your Jmeter Scripts?

Answer :

Using config factors like "CSV Data Set Config", "User Defined Variables", and so on for greater statistics reuse.
Modularizing shared tasks and invoking them thru a "Module Controller".
Writing your very own BeanShell features, and reusing them.
Question 35. Are The Test Plans Built Using Jmeter Os Dependant?

Answer :

Test plans are typically stored in thr XML format, for this reason they have got nothing to do with any precise OS. You can run the ones test plans on any OS in which JMeter can run.

Question 36. What Are The Monitor Tests?

Answer :

Uses of screen assessments are:

Monitors are beneficial for a pressure trying out and system management.
Used with stress testing, the monitor presents additional statistics about server overall performance.
Monitors makes it easier to look the relationship among server performance and response time on the customer side.
As a gadget administration device, the display gives an clean way to display more than one servers from one console.
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Question 37. What Are Jmeter Functions?

Answer :

JMeter functions are unique values that could populate fields of any Sampler or different detail in a take a look at tree.
A feature call looks as if this:

$__functionName(var1,var2,var3)

Question 38. Where Can Functions And Variables Be Used?

Answer :

Functions and variables may be written into any discipline of any take a look at component.

Question 39. What Are Regular Expressions In Jmeter?

Answer :

Regular expressions are used to search and manipulate text, based totally on patterns. JMeter interprets types of ordinary expressions or styles getting used all through a JMeter test plan, with the aid of including the sample matching software program Apache Jakarta ORO.

Question forty. How Can You Reduce Resource Requirements In Jmeter?

Answer :

Below are a few concept to lessen resource requirements:

Use non-GUI mode: jmeter -n -t test.Jmx -l take a look at.Jtl.
Use as few Listeners as viable; if the use of the -l flag as above they can all be deleted or disabled.
Disable the “View Result Tree” listener because it consumes loads of memory and might result in the console freezing or JMeter walking out of memory. It is, however, safe to use the “View Result Tree” listener with only “Errors” checked.
Rather than the use of plenty of comparable samplers, use the equal sampler in a loop, and use variables (CSV Data Set) to vary the sample. Or possibly use the Access Log Sampler.
Don't use practical mode.
Use CSV output instead of XML.
Only keep the statistics which you want.
Use as few Assertions as possible.
Disable all JMeter graphs as they devour a number of reminiscence. You can view all of the actual time graphs using the JTLs tab in your internet interface.
Do now not forget to erase the nearby direction from CSV Data Set Config if used.
Clean the Files tab prior to every check run.
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