JMeter Top most asked Interview Questions | JMeter refresher by Raghav Pal |
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- เผยแพร่เมื่อ 3 ก.ค. 2024
- JMeter Complete Course - • JMeter Full Course Mas...
00:00 Start
00:39 What is JMeter
01:17 Features of JMeter
02:52 How to setup JMeter on windows & mac os
06:53 Overview of GUI & Features
08:21 How to prepare for a Performance Test
12:51 Test Plan
14:10 Thread Group
16:21 Controllers
16:39 Samplers
18:30 Logical Controllers
19:27 Listeners
23:52 Command Line
26:13 Assertions
28:19 Config Elements
30:04 Timers
32:40 Pre-Processors & Post-Processors
33:37 Test Fragment
34:23 Non-Test Elements
35:36 Execution Order
36:54 Best Practices
#JMeterMostAskedInterviewQuestions
Module & Include Controller - • JMeter Intermediate Tu...
Config Elements 1 - • 10 | JMeter | Config ...
Config Elements 2 - • 11 | JMeter | Config E...
What is JMeter:
Tool or Application for performance testing
Free & Open Source
Built with Java
Features of JMeter:
Completely free
for performance testing of a variety of applications
Web | API | FTP | DB | LDAP
Option for Recording
Inbuilt components for adding assertions & reporting
Extensible using plugins
JMeter is a server-side performance testing tool
How to setup JMeter:
1 - Check java is installed java -version
2 - Download JMeter
3 - Unzip
4 - Start JMeter
bin/jmeter.bat (win)
bin/jmeter.sh (mac/linux)
Overview of GUI & Features
How to prepare for a Performance Test:
Get approvals & authorizations
Application & Environment
Requirements for the test - What to test, Scenarios
Test Data
Expected behaviour or performance OR Baseline
Reporting Format
Test Plan:
is a like a project where all the elements of the performance test are added
It saves as a .jmx file
Inside JMeter the Test Plan stores & displays the elements of the test in a tree view
A minimal test will consist of the Test Plan, a Thread Group & one or more Samplers
Thread Group:
A Thread Group is a collection of threads
Every JMeter test plan starts with this element
Each thread represents one user using the application under test
In a thread group element, we can define the
No of users (threads)
Ramp up & down
Loops / iterations
Controllers:
JMeter has two types of Controllers - Samplers & Logical Controllers
Samplers:
Tell JMeter to send requests to a server & wait for a response
They are processed in the order they appear in the tree
Each sampler (except Flow Control Action) generates one or more sample results
Logical Controllers:
determine the order in which Samplers are processed
let you customize the logic that JMeter uses to decide when to send requests
Listeners:
Components that show the result of the samplers
Tree | Table | Graphs
also provide means to view, save, read saved test results
Listeners are processed at the end of the scope in which they are found
Listeners can use a lot of memory if there are a lot of samples
To minimize the amount of memory needed, use the Simple Data Writer
Command Line
On cmd prompt
Goto the location of JMeter bin folder
jmeter -n -t “location of imx file” -l “location of result file csv”
Assertions:
Assertion = Check or Validation
Check Actual = Expected
processed after every sampler in the same scope
Config Elements:
to set up defaults & variables for later use by samplers
processed at the start of the scope in which they are found, i.e. before any samplers in the same scope
Timers:
to add delay (pause) before sampler request
By default, JMeter thread executes samplers in sequence without pausing
If more than 1 timers are used in Thread Group, JMeter will take the sum of the timers to pause
can be added as children of samplers or controllers
Pre-Processors:
executes prior to a Sampler Request
modify the settings of a Sample Request Or update variables
Post-Processors:
executes after a Sampler Request
to process the response data, to extract values from it
Test Fragment:
special type of controller used with the Include Controller & Module Controller
not executed unless it is referenced by either a Module Controller or an Include_Controller.
This element is purely for code reuse within Test Plans
Non-Test Elements:
HTTP Mirror Server
HTTP(s) Test Script Recorder
Property Display
Execution order:
Configuration elements
Pre-Processors
Timers
Sampler
Post-Processors (unless SampleResult is null)
Assertions (unless SampleResult is null)
Listeners (unless SampleResult is null)
Best practices
1. Always do performance testing on a separate env - not used for other activities
2. Run your tests with the same infrastructure, network stats etc. - consistent results | compare with baseline
3. Create more realistic test - add think time
4. Add some ramp up, Do not start directly with 1000 users
5. Always have a baseline to compare your test
6. JMeter checks the server performance & does not care for browser render time
7. Focus on the areas that need performance testing based on user scenario
8. Always document your results
Share this with everyone
If my work has helped you, consider helping an animal near you, in any way you can
Never Stop Learning
Raghav
![[ IN HINDI ] Apache JMeter | Load Testing | Performance Testing | 2024](/img/n.gif)
Thanks Raghav. As always, a very useful video. You are a great teacher.
So nice of you
You are simple and cool tutor. Unique Guy. Keep it..
Thanks Vinod
A nice video to clear out some of the basics
Happy to hear that
This is so helpful! Thanks.
Most welcome Daniel
Video is just awesome👍it really helpful for me..Thank you so much... Keep going ..😊
Most welcome 😊
Thank you very much raghav, watching your video before going for a performance testing consultant role interview ❤
Great to know Abhishek. All the best
thanks Sir, wishing you all the best
So nice of you
Very helpful..Appreciate u r hardwork👏
Thanks a lot 😊
Hi Raghav..this is very useful video for interview..thanks for helping us.
Glad you liked it Pooja
Thanks @Raghav for the video 👍🙂
Most welcome Sarang
One of the greatest thing and I like the second most thing from Raghav Pal is adding the notes in the description. The first thing I love the most is his explanation of topics made the learning at ease and less stressful. This is very useful for a reason. Than you Raghav Pal for contributing the knowledge to others. Keep doing the good work sir
Thanks a ton Ramana..thanks for your kind words. humbled
Thankyou for very informative session
Most Welcome Ruchin
Thank you for this video
So nice of you Pedro
Thanks Raghav.
Most welcome Amiya
Very good tutorial I have cleared all doubts
Glad to hear that
Most Waited Video..thanks for uploading video....
RAGHAV Sir today your Look changed..
Its Good..to See..🙂🙂
Thanks
Same here, most awaited video 😊👍
Thanks Raghav :)
Most welcome Peeyush
Nice tutorial
Thanks Ishan
Very nicely explained - novice to beginner level can definitely clear the interview .. Raghav ji Please make some zero to hero series to learn it more
Sure, will do Lavanya.. thanks
Hi Raghav Sir, this is helpful and thanks for helping so many with your teaching.
Your channel is so good that I have two subscriptions with different accounts.
I have one question, can you please make a video in which we can know the real customer scenarios for JMeter test with API testing from your experience.
Some real time customer scenarios.
Also how to use the Groovy inside the JMeter and use it.
Thanks
I will do Arya, thanks
Thankyou raghav for creating such a detail video. Its helpful for beginners and experience as u have shared example for each as well as details in description. It will be helpful if you can share scenario-based questions for e.g i have 200url in csv i want to segregate url giving 200/400 or i want to verify url in loop based on each category for e.g in google search all video, image one after another.
Sure, I will plan Hanika
By the way this video was awesome 👍😎.
Thanks
Thank you so much Raghav for this useful video . Kind of brushing up post. Well, I am planning to take ISTQB specialist Performance Testing certification. It will be helpful if you can make some tutorials on the syllabus.
Sure, I will do
Thank you so much Sir for uploading this, really very helpful. Almost every company asks for Jmeter experience these days when we look for Performance Testing role, please let me know if this content is enough for me to clear the interview as well as to clear the Official Jmeter Intro Certification Exam ??
Hi Vybhav, you will need to do hands-on, Can find tutorials here - automationstepbystep.com/
@@RaghavPal Sure, thanks a lot. I am happy to inform that I have cleared the Blazemeter Jmeter Intro level certification.The Blazemeter University course also helped me in interview preparation for Jmeter to an extent. Thank you so much once again for the Jmeter Tutorial playlist which really helped me to understand the Jmeter concepts well and hence to be able to successfully get certified in Jmeter Intro level ☺️
Thanks a lot Raghav.. I have a performance testing interview on this Saturday. I have completed your jmeter beginners entire course and this one. Also in my current project I have created simple test plans also.. Is it enough for this interview? Do I need to check on intermediate level videos also?
Hi Swathy, if you have done good hands-on, it should be fine
Hi Raghav please make a video for Jmeter performance testing using beanshell interview questions?
Sure, will plan Vipin
Hi Raghav, in loadrunner we have 3 pacing options, and almost we go with -start new iteration at fixed intervals every **** seconds ..... Let's assume me have given 60 sec as pacing and our iteration is taking 58sec then it will wait for 2 sce before starting the nxt iteration and if the iteration is taking 62 sec then the nxt iteration starts immediately without any wait time.... How can we implement this in Jmeter?
Hi Sandhya,
In JMeter, you can implement a similar pacing option using a Constant Timer element.
Here are the steps to implement the pacing option:
Add a Constant Timer element under the Thread Group element in your test plan.
Set the "Thread Delay" value to the desired pacing time in milliseconds. For example, if you want to wait for 60 seconds between iterations, set the "Thread Delay" value to 60000.
Set the "Calculate Throughput based on" value to "this thread only". This will ensure that the pacing time is applied per thread and not across all threads in the test plan.
If your iteration takes less time than the pacing time, the Constant Timer will add a delay to wait until the next pacing time. If your iteration takes longer than the pacing time, the Constant Timer will not add any additional delay before starting the next iteration.
Note: The Constant Timer element will add a delay after each sampler element in the thread group, so make sure to place it at the end of the thread group if you want to apply the pacing time to the entire thread group.
I hope this helps! Let me know if you have any other questions.
Humble request :-. Try to show demo in windows laptop.
Your most of videos are in Mac OS.
🙏
Sure Madhav, this was mostly on windows
Hi Raghav, Thanks for this knowledge sharing session, do you have Spike test,
Below topics would be great if you can make videos
+ Create Spike Testing Script with JMeter
+ Execute Script
+ Analyze Test Result
Hi Aswath
I will check and plan on this
@@RaghavPal thanks a lot for replying
@@RaghavPal any plans UI performance test sessions ?
We can use JMeter for that. Let me know if you need any specific tool
Hi raghav asking feom interviews perspective and realtim work.. Does one needs to have scripting coding knowledgea for performance testing and that also in jmeter...? Like bash scripting would be required...
Hi Adarsh, this will ans your query - th-cam.com/video/LGBd4qSt3JM/w-d-xo.html
When we load Url of my project . Microsoft login page appear and has api as ' authorize?client_id' it has a parameter client-request-id from where value is appear . And how to automate through jmeter. Simply asking how to correlate client-request-id
Hi Prem,
In order to automate the Microsoft login page using JMeter, you will need to extract the value of the "client_request_id" parameter and use it in subsequent requests
Here are the steps you can follow:
Add a "HTTP Request" sampler to your test plan and configure it to load the URL of your project
Add a "Regular Expression Extractor" post-processor to the "HTTP Request" sampler, and configure it to extract the value of the "client_request_id" parameter from the response. Use the following regular expression: "client_request_id=(.+?)&" and set the "Reference Name" to something like "client_request_id"
Add another "HTTP Request" sampler for the authorize API and configure it to use the extracted "client_request_id" value as a parameter. You can use the ${client_request_id} variable to reference the extracted value
Ensure that the "Regular Expression Extractor" is placed after the sampler and the value is being stored to use it in the next sampler.
Run your test and check the results, you will see the client_request_id is being passed in the authorize API.
You can also use "Debug Sampler" to check the extracted value of the client-request-id
note: above steps are based on the assumption that the client_request_id value is being passed in the response of the first request. If the value is being passed in another way, you will have to adjust the steps accordingly
any video sir, how we do functional testing with jmeter
Yes, can find here - automationstepbystep.com/
Sir can u provide neoload and load runner detailed tutorials plss it would be very helpful to u
Hi Harish, I will plan
What are the scenario for E-commerce website? How to validate it? please make a video
I will do Deepak
brother please do video about data base
I will plan Balaji.
sir make a complete course on loadrunnner also like jmeter.
Thanks sir you are really helping many people
Hii Raghav ...iam having one issue ...iam working in for one of the MNC ..iam working as performance tester using jmter...my issue is after recording. body(not response body) data is commenting.which ever data is passing in the body entire data is commented. Commucated with development team as well .they said that body of data containing the application URL..cause of forward slash (//) tool is commenting data.
Is there any way to over come this issue . Can u let me know the resolution if having any idea about data commented in body.
Thank you in advance
will need some example Ayana
Hi Where do I put the auth token ?
Pooja
You can put the auth token in JMeter in a few different places, depending on how you want to use it.
*HTTP Header Manager*
The most common place to put the auth token is in the HTTP Header Manager. This will allow you to send the auth token with all of your requests.
To add the auth token to the HTTP Header Manager, follow these steps:
1. Right-click on the Test Plan and select Add > Config Element > HTTP Header Manager.
2. In the HTTP Header Manager, add a new header with the following name and value:
```
Name: Authorization
Value: Bearer {token}
```
Replace `{token}` with your auth token.
*User Defined Variables*
Another way to put the auth token in JMeter is to use a User Defined Variable. This allows you to store the auth token in a central location and then use it in multiple requests.
To add the auth token to a User Defined Variable, follow these steps:
1. Right-click on the Test Plan and select Add > Config Element > User Defined Variables.
2. In the User Defined Variables window, add a new variable with the following name and value:
```
Name: auth_token
Value: {token}
```
Replace `{token}` with your auth token.
*Once you have added the auth token to JMeter, you can use it in your requests by referencing the variable name.* For example, to send the auth token in the header of a request, you would use the following expression:
```
${auth_token}
```
*Which method you choose to use depends on your specific needs and preferences.* The HTTP Header Manager is the most common method, but using User Defined Variables can be useful if you need to use the auth token in multiple requests.
I hope this helps
Hello Raghav sir, could you please upload video for mobile performance testing, I'm not able to record the script for mobile application, i referred your videos eventhough not able to record the script, can you please help us
Hi Sakthi, the existing videos are already published, will need to check online
sir how to connect jmeter into the browser of jmeter version 5.5 ??
Hi Prani,
To connect JMeter to the browser, you need to set up a proxy server in JMeter and configure your browser to use that proxy server.
Here are the steps to set up a proxy server in JMeter version 5.5:
Open JMeter and create a new Test Plan.
Right-click on the Test Plan and select Add > Threads (Users) > Thread Group.
In the Thread Group, add a new Config Element by right-clicking on the Thread Group and selecting Add > Config Element > HTTP Request Defaults.
In the HTTP Request Defaults, set the Server Name or IP field to the hostname or IP address of the website you want to test.
Next, add a new Sampler by right-clicking on the Thread Group and selecting Add > Sampler > HTTP Request.
In the HTTP Request, set the Path field to the path of the website you want to test (e.g., /index.html).
Now, add a new Config Element by right-clicking on the Thread Group and selecting Add > Config Element > HTTP(S) Test Script Recorder.
In the HTTP(S) Test Script Recorder, set the Target Controller field to the name of the Sampler you created in step 5.
Click the Start button to start the recorder.
Now, you need to configure your browser to use JMeter as a proxy server. Here are the steps to do that:
Open your browser's settings and navigate to the network or proxy settings
Set the proxy settings to use the IP address and port number of the JMeter proxy server. By default, the JMeter proxy server listens on port 8888.
Save the proxy settings and start browsing the website you want to test.
JMeter will record all the HTTP requests and responses as you browse the website, allowing you to create and run performance tests based on that data
In view result tree(http request) some of the response has been failed .So how to what's the error? why failed? please ans
Hi Deepak, for that you can add assertions and also add assertion listener
Hi raghav, could you please attach a PDF for the interview question
Sure, I have added all notes in description too
If we are recording the Scripts through Proxy in JMeter and we get an error then what should we do?
will need to see the logs and error details
@@RaghavPal thank you sir.
Hi raghav, really great working ...I want to ask you about ""regular expressions "" , you know if we record a script or a scenario has credentials like (user name & password) server give us a ""session Id"" you know that's ^ unique ^ so if we rerun our script , an error will occurred because of it , how we can handle that ? ...thank you
Hi Karim, not very sure, will need to check on this online
You can achieve it by correlation in JMeter. You can get the dynamic value(here sessionid) using the post processor, Regular Expression Extractor. And pass this to subsequent requests.
@@RaghavPal OK raghav, thank you very much and I am very interested in your Testing topics.
Do we have any scenario based interview questions?
This video covers some of the scenarios. I will plan to add more in future. In the daily quizzes most of the questions are scenario based - www.youtube.com/@RaghavPal/community
Here you will need to search with JMeter
Shut down and initial time delay what is
We have 2 options to stop a running test
Stop - stops abruptly and cancels any running threads
Shutdown - stops gracefully, waits for any running thread to complete
Initial time delay - Hope you are talking about start up delays here - this is to specify after how many seconds each thread will start
Hi Raghav,
I am Avanthi and having 10years of experience in manual testing....now I wanna learn any other tool....i do not know ABC of coding.....
I request you to suggest me what would I learn....is it selenium testing or performance testing or any other tools...
Please Raghav....i request you to suggest
Hello Avanthi.. So if you want to move into Automation as many companies these days are expecting us to know it, you can first select any programming language(Java /Javascript) and clear the basics and then move on with any of the UI testing tools like Selenium, Cypress or Playwright and start learning and mastering it and start developing a framework, Similarly if you want to go for Api testing you can select Rest Assured,Soap UI, Karate framework etc and start mastering it, If you want to go into mobile testing you can select Appium as it is most popular and used everywhere.. But if you feel that your coding is weak ,you can go ahead with the performance testing tools like jmeter, loadrunner etc but yeah even in these a little bit of scripting knowledge is required so its better you learn any programming knowledge first and then pick any of the tools as per your requirements. There is also other Datawarehouse Testing/ETL Testing but in this your SQL should be really strong.
Good suggestions Ash, hope it helps Avanthi
@@ashking1113 thanks alot Ash...thanks for taking time and replying to my comment....
Surely i will consider your suggestion and will work accordingly 🙂