LoadRunner interview questions

  1. What is load testing? - Load testing is to test that if the application works fine with the loads that result from large number of simultaneous users, transactions and to determine weather it can handle peak usage periods.
  2. What is Performance testing? - Timing for both read and update transactions should be gathered to determine whether system functions are being performed in an acceptable timeframe. This should be done standalone and then in a multi user environment to determine the effect of multiple transactions on the timing of a single transaction.

  3. Did u use LoadRunner? What version? - Yes. Version 7.2.
  4. Explain the Load testing process? -
    Step 1: Planning the test. Here, we develop a clearly defined test plan to ensure the test scenarios we develop will accomplish load-testing objectives. Step 2: Creating Vusers. Here, we create Vuser scripts that contain tasks performed by each Vuser, tasks performed by Vusers as a whole, and tasks measured as transactions. Step 3: Creating the scenario. A scenario describes the events that occur during a testing session. It includes a list of machines, scripts, and Vusers that run during the scenario. We create scenarios using LoadRunner Controller. We can create manual scenarios as well as goal-oriented scenarios. In manual scenarios, we define the number of Vusers, the load generator machines, and percentage of Vusers to be assigned to each script. For web tests, we may create a goal-oriented scenario where we define the goal that our test has to achieve. LoadRunner automatically builds a scenario for us. Step 4: Running the scenario.
    We emulate load on the server by instructing multiple Vusers to perform tasks simultaneously. Before the testing, we set the scenario configuration and scheduling. We can run the entire scenario, Vuser groups, or individual Vusers. Step 5: Monitoring the scenario.
    We monitor scenario execution using the LoadRunner online runtime, transaction, system resource, Web resource, Web server resource, Web application server resource, database server resource, network delay, streaming media resource, firewall server resource, ERP server resource, and Java performance monitors. Step 6: Analyzing test results. During scenario execution, LoadRunner records the performance of the application under different loads. We use LoadRunner’s graphs and reports to analyze the application’s performance.
  5. When do you do load and performance Testing? - We perform load testing once we are done with interface (GUI) testing. Modern system architectures are large and complex. Whereas single user testing primarily on functionality and user interface of a system component, application testing focuses on performance and reliability of an entire system. For example, a typical application-testing scenario might depict 1000 users logging in simultaneously to a system. This gives rise to issues such as what is the response time of the system, does it crash, will it go with different software applications and platforms, can it hold so many hundreds and thousands of users, etc. This is when we set do load and performance testing.
  6. What are the components of LoadRunner? - The components of LoadRunner are The Virtual User Generator, Controller, and the Agent process, LoadRunner Analysis and Monitoring, LoadRunner Books Online.
  7. What Component of LoadRunner would you use to record a Script? - The Virtual User Generator (VuGen) component is used to record a script. It enables you to develop Vuser scripts for a variety of application types and communication protocols.
  8. What Component of LoadRunner would you use to play Back the script in multi user mode? - The Controller component is used to playback the script in multi-user mode. This is done during a scenario run where a vuser script is executed by a number of vusers in a group.
  9. What is a rendezvous point? - You insert rendezvous points into Vuser scripts to emulate heavy user load on the server. Rendezvous points instruct Vusers to wait during test execution for multiple Vusers to arrive at a certain point, in order that they may simultaneously perform a task. For example, to emulate peak load on the bank server, you can insert a rendezvous point instructing 100 Vusers to deposit cash into their accounts at the same time.
  10. What is a scenario? - A scenario defines the events that occur during each testing session. For example, a scenario defines and controls the number of users to emulate, the actions to be performed, and the machines on which the virtual users run their emulations.
  11. Explain the recording mode for web Vuser script? - We use VuGen to develop a Vuser script by recording a user performing typical business processes on a client application. VuGen creates the script by recording the activity between the client and the server. For example, in web based applications, VuGen monitors the client end of the database and traces all the requests sent to, and received from, the database server. We use VuGen to: Monitor the communication between the application and the server; Generate the required function calls; and Insert the generated function calls into a Vuser script.
  12. Why do you create parameters? - Parameters are like script variables. They are used to vary input to the server and to emulate real users. Different sets of data are sent to the server each time the script is run. Better simulate the usage model for more accurate testing from the Controller; one script can emulate many different users on the system.
  13. What is correlation? Explain the difference between automatic correlation and manual correlation? - Correlation is used to obtain data which are unique for each run of the script and which are generated by nested queries. Correlation provides the value to avoid errors arising out of duplicate values and also optimizing the code (to avoid nested queries). Automatic correlation is where we set some rules for correlation. It can be application server specific. Here values are replaced by data which are created by these rules. In manual correlation, the value we want to correlate is scanned and create correlation is used to correlate.
  14. How do you find out where correlation is required? Give few examples from your projects? - Two ways: First we can scan for correlations, and see the list of values which can be correlated. From this we can pick a value to be correlated. Secondly, we can record two scripts and compare them. We can look up the difference file to see for the values which needed to be correlated.  In my project, there was a unique id developed for each customer, it was nothing but Insurance Number, it was generated automatically and it was sequential and this value was unique. I had to correlate this value, in order to avoid errors while running my script. I did using scan for correlation.
  15. Where do you set automatic correlation options? - Automatic correlation from web point of view can be set in recording options and correlation tab. Here we can enable correlation for the entire script and choose either issue online messages or offline actions, where we can define rules for that correlation. Automatic correlation for database can be done using show output window and scan for correlation and picking the correlate query tab and choose which query value we want to correlate. If we know the specific value to be correlated, we just do create correlation for the value and specify how the value to be created.
  16. What is a function to capture dynamic values in the web Vuser script? - Web_reg_save_param function saves dynamic data information to a parameter.
  17. When do you disable log in Virtual User Generator, When do you choose standard and extended logs? - Once we debug our script and verify that it is functional, we can enable logging for errors only. When we add a script to a scenario, logging is automatically disabled. Standard Log Option: When you select
    Standard log, it creates a standard log of functions and messages sent during script execution to use for debugging. Disable this option for large load testing scenarios. When you copy a script to a scenario, logging is automatically disabled Extended Log Option: Select
    extended log to create an extended log, including warnings and other messages. Disable this option for large load testing scenarios. When you copy a script to a scenario, logging is automatically disabled. We can specify which additional information should be added to the extended log using the Extended log options.
  18. How do you debug a LoadRunner script? - VuGen contains two options to help debug Vuser scripts-the Run Step by Step command and breakpoints. The Debug settings in the Options dialog box allow us to determine the extent of the trace to be performed during scenario execution. The debug information is written to the Output window. We can manually set the message class within your script using the lr_set_debug_message function. This is useful if we want to receive debug information about a small section of the script only.
  19. How do you write user defined functions in LR? Give me few functions you wrote in your previous project? - Before we create the User Defined functions we need to create the external
    library (DLL) with the function. We add this library to VuGen bin directory. Once the library is added then we assign user defined function as a parameter. The function should have the following format: __declspec (dllexport) char* <function name>(char*, char*)Examples of user defined functions are as follows:GetVersion, GetCurrentTime, GetPltform are some of the user defined functions used in my earlier project.
  20. What are the changes you can make in run-time settings? - The Run Time Settings that we make are: a) Pacing - It has iteration count. b) Log - Under this we have Disable Logging Standard Log and c) Extended Think Time - In think time we have two options like Ignore think time and Replay think time. d) General - Under general tab we can set the vusers as process or as multithreading and whether each step as a transaction.
  21. Where do you set Iteration for Vuser testing? - We set Iterations in the Run Time Settings of the VuGen. The navigation for this is Run time settings, Pacing tab, set number of iterations.
  22. How do you perform functional testing under load? - Functionality under load can be tested by running several Vusers concurrently. By increasing the amount of Vusers, we can determine how much load the server can sustain.
  23. What is Ramp up? How do you set this? - This option is used to gradually increase the amount of Vusers/load on the server. An initial value is set and a value to wait between intervals can be
    specified. To set Ramp Up, go to ‘Scenario Scheduling Options’
  24. What is the advantage of running the Vuser as thread? - VuGen provides the facility to use multithreading. This enables more Vusers to be run per
    generator. If the Vuser is run as a process, the same driver program is loaded into memory for each Vuser, thus taking up a large amount of memory. This limits the number of Vusers that can be run on a single
    generator. If the Vuser is run as a thread, only one instance of the driver program is loaded into memory for the given number of
    Vusers (say 100). Each thread shares the memory of the parent driver program, thus enabling more Vusers to be run per generator.
  25. If you want to stop the execution of your script on error, how do you do that? - The lr_abort function aborts the execution of a Vuser script. It instructs the Vuser to stop executing the Actions section, execute the vuser_end section and end the execution. This function is useful when you need to manually abort a script execution as a result of a specific error condition. When you end a script using this function, the Vuser is assigned the status "Stopped". For this to take effect, we have to first uncheck the “Continue on error” option in Run-Time Settings.  
  26. What is the relation between Response Time and Throughput? - The Throughput graph shows the amount of data in bytes that the Vusers received from the server in a second. When we compare this with the transaction response time, we will notice that as throughput decreased, the response time also decreased. Similarly, the peak throughput and highest response time would occur approximately at the same time.
  27. Explain the Configuration of your systems? - The configuration of our systems refers to that of the client machines on which we run the Vusers. The configuration of any client machine includes its hardware settings, memory, operating system, software applications, development tools, etc. This system component configuration should match with the overall system configuration that would include the network infrastructure, the web server, the database server, and any other components that go with this larger system so as to achieve the load testing objectives.
  28. How do you identify the performance bottlenecks? - Performance Bottlenecks can be detected by using monitors. These monitors might be application server monitors, web server monitors, database server monitors and network monitors. They help in finding out the troubled area in our scenario which causes increased response time. The measurements made are usually performance response time, throughput, hits/sec, network delay graphs, etc.
  29. If web server, database and Network are all fine where could be the problem? - The problem could be in the system itself or in the application server or in the code written for the application.
  30. How did you find web server related issues? - Using Web resource monitors we can find the performance of web servers. Using these monitors we can analyze throughput on the web server, number of hits per second that
    occurred during scenario, the number of http responses per second, the number of downloaded pages per second.
  31. How did you find database related issues? - By running “Database” monitor and help of “Data Resource Graph” we can find database related issues. E.g. You can specify the resource you want to measure on before running the controller and than you can see database related issues
  32. Explain all the web recording options?
  33. 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.
  34. How did you plan the Load? What are the Criteria? - Load test is planned to decide the number of users, what kind of machines we are going to use and from where they are run. It is based on 2 important documents, Task Distribution Diagram and Transaction profile. Task Distribution Diagram gives us the information on number of users for a particular transaction and the time of the load. The peak usage and off-usage are decided from this Diagram. Transaction profile gives us the information about the transactions name and their priority levels with regard to the scenario we are deciding.
  35. What does vuser_init action contain? - Vuser_init action contains procedures to login to a server.
  36. What does vuser_end action contain? - Vuser_end section contains log off procedures.  
  37. What is think time? How do you change the threshold? -   Think time is the time that a real user waits between actions. Example: When a user receives data from a server, the user may wait several seconds to review the data before responding. This delay is known as the think time. Changing the Threshold: Threshold level is the level below which the recorded think time will be ignored. The default value is five (5) seconds. We can change the think time threshold in the Recording options of the Vugen.
  38. What is the difference between standard log and extended log? - The standard log sends a subset of functions and messages sent during script execution to a log. The subset depends on the Vuser type Extended log sends a detailed script execution messages to the output log. This is mainly used during debugging when we want information about: Parameter substitution. Data returned by the server. Advanced trace.
  39. Explain the following functions: - lr_debug_message - The lr_debug_message function sends a debug message to the output log when the specified message class is set. lr_output_message - The lr_output_message function sends notifications to the Controller Output window and the Vuser log file. lr_error_message - The lr_error_message function sends an error message to the LoadRunner Output window. lrd_stmt - The lrd_stmt function associates a character string (usually a SQL statement) with a cursor. This function sets a SQL statement to be processed. lrd_fetch - The lrd_fetch function fetches the next row from the result set.
  40. Throughput -  If the throughput scales upward as time progresses and the number of Vusers increase, this indicates that the bandwidth is sufficient. If the graph were to remain relatively flat as the number of Vusers increased, it would
    be reasonable to conclude that the bandwidth is constraining the volume of
    data delivered. 
  41. Types of Goals in Goal-Oriented Scenario -  Load Runner provides you with five different types of goals in a goal oriented scenario:
    • The number of concurrent Vusers
    • The number of hits per second
    • The number of transactions per second
    • The number of pages per minute
    • The transaction response time that you want your scenario
  42. Analysis Scenario (Bottlenecks): In Running Vuser graph correlated with the response time graph you can see that as the number of Vusers increases, the average response time of the check itinerary transaction very gradually increases. In other words, the average response time steadily increases as the load
    increases. At 56 Vusers, there is a sudden, sharp increase in the average response
    time. We say that the test broke the server. That is the mean time before failure (MTBF). The response time clearly began to degrade when there were more than 56 Vusers running simultaneously.
  43. What is correlation? Explain the difference between automatic correlation and manual correlation? - Correlation is used to obtain data which are unique for each run of the script and which are generated by nested queries. Correlation provides the value to avoid errors arising out of duplicate values and also optimizing the code (to avoid nested queries). Automatic correlation is where we set some rules for correlation. It can be application server specific. Here values are replaced by data which are created by these rules. In manual correlation, the value we want to correlate is scanned and create correlation is used to correlate.
  44. Where do you set automatic correlation options? - Automatic correlation from web point of view, can be set in recording options and correlation tab. Here we can enable correlation for the entire script and choose either issue online messages or offline actions, where we can define rules for that correlation.  Automatic correlation for database, can be done using show output window and scan for correlation and picking the correlate query tab and choose which query value we want to correlate. If we know the specific value to be correlated, we just do create correlation for the value and specify how the value to be created.
  45. What is a function to capture dynamic values in the web vuser script? - Web_reg_save_param function saves dynamic data information to a parameter.
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87 Comments on LoadRunner interview questions

  1. Anand
    Posted 11/7/2006 at 2:07 am | Permalink


    This is the best information i could get about
    Load Runner..
    i am thankful for that.

  2. Kalyan M
    Posted 2/23/2007 at 1:40 am | Permalink

    Bug report is used to place the bug in Xl sheet.It contains
    Top Of the Screen
    Project Id
    Project name
    Project Manager Name
    Module name
    QA Name
    Tester Name
    And Then…
    Serial No
    Bug Id
    Modul Name(which Screen u Did Testing)
    Bug Description
    Bug Status
    QA Comments
    Reported Date
    Closed Date
    Developer comments

  3. Jamshaid Ashraf
    Posted 4/17/2007 at 8:51 am | Permalink

    I’m using Web HTML/HTTP protocol for testing java(Applet) base application, when i start recording i provide full server url and configure as URL base recoding but as application going to load applet it waits so much time but dont allow to load applet but if i access same url witout recording then applet prpperly and quickly load can any one solve my problem or can suggest me regarding this issue.


  4. Pooja Lele
    Posted 5/7/2007 at 4:00 pm | Permalink

    The site is very informative.

    Had a quick question about correlation in Load Runner.

    I have to perform Manual correlation using web_reg_save_param function.

    However the data does not have LB and RB cause it is in a table view.

    Can someone please explain me the step by step process of how Manual Correlation takes place and what are the results of this correlation and how is it indicated that the values are correlated. Please explain in detail

  5. Leena K
    Posted 5/8/2007 at 7:03 am | Permalink

    Number of virtual users depend on so many things:-
    1)Software license(Some license allow 250 Vusers, some allows 500 it depends on cost of s/w)
    2)Type of Application
    3)Hardware of m/c
    4)hardware of server m/c

  6. sunitha
    Posted 7/26/2007 at 10:32 am | Permalink

    Can any one tell me how manual correlation is done and with 2 LB and 2RB ?

  7. Ganesh
    Posted 10/18/2007 at 10:38 am | Permalink

    @Jamshaid Ashraf —

    Look at the different scenarios and possibilities:-

    1)If run-time settings of controller—-Enable Applets during running is checked.
    2)If the Loadgenerator m/c where the script runs has any issues with the loading of applets.
    3)Alternatively you could try using the multiple protocol(http/html)mode.
    4)Check the code — If the service function that you are calling for the loading of applet needs any change.
    5)Explore other possibilities!


  8. Gaylord
    Posted 11/13/2007 at 4:32 pm | Permalink

    If you are asking this type of questions during an interview, you will end up hiring a loadrunner expert that has no knowledge of performance. If you want to solve a performance problem, ask performance related questions. Loadrunner is merely a tool. It is no different then say microsoft excel. When you hire an accountant do you want an expert in Excel or someone that understands accounting concepts?

  9. luth92
    Posted 12/3/2007 at 5:18 am | Permalink


    The site is very informative,i hope so i’ll find answer to my question.I try to modified a existing script by add a new part on there.But i’ve a warning message like:”Warning - window “name of window” is at a different location than in the recording”
    I really don’t know what is the problem.And my script failed with a wrong message “Error: Got unexpected disconnect event, exiting …”

    Someone can help to resolve this case?
    Thank you so much for your help.


  10. Terence Le
    Posted 3/10/2008 at 4:29 pm | Permalink

    Please tell me under what type of application, will you select multi protocol for scripting? What are the correct protocols to be selected for Web based and Client-Server type of applications? Thank you.

  11. sysgate
    Posted 3/24/2008 at 7:22 am | Permalink

    Terence, for such task you should choose WEB/HTTP/HTML script. This type of protocol will allow you to use even C functions.
    I have another question - has someone managed to use FTPS implemention ? I have FTP included in my license, but the built-in capabilities of LR doesn’t seem to allow me using FTPS. Running external client is not an option for me.

  12. Terence
    Posted 3/25/2008 at 1:59 pm | Permalink

    Thank you much for feed back. To be more specific if I have a JSwing on the Client side accessing ORA 9i on the Back end. Will WINSOCK be the appropriate protocol for VuGen? Also what (if anyone has encountered) are most common errors you have come across in using WINSOCK (this type of question does come up in LR technical interview)?
    W/r to the FTPS question, FTPS is supposed to be a secured FTP protocol allowing encryption. I would think in LR recording, one can still use the regular FTP protocol and LR through APIs, will handle the decryption so the Request/Response will be processed as if FTP was used. But I have not tried, so I can’t really say. Thank you.

  13. Terence
    Posted 4/1/2008 at 2:28 pm | Permalink

    Please tell me if LR Generator is to be installed on another machine from the LR Controller, then where would it be the proper place to install the VUGen Component? Would the VuGen and the LR Generator be on same machine as this is where the LR Generator would invoke Vuser scripts through the LR Agent to run? Thanks.

  14. A True Performance Tester
    Posted 5/7/2008 at 8:11 pm | Permalink

    Here is a tip, if you are not of US decent I will automatically toughen the interview by 100% and ask you to write C code and examples of functions you have written in the past. This is a great site if your interviewer does not know the tools, but beware if you think you can get by with simply these answers in an interview. You must have full knowledge of performance testing, not just picked up the manual which one of your friends stole from a client site.


  15. A True Performance Tester
    Posted 5/7/2008 at 8:13 pm | Permalink

    If you were considering interviewing for a performance testing position you would not need to look for answers to interview questions! Pray you do not have to interview with myself or any of my collegues.


  16. Perf Tester
    Posted 5/21/2008 at 12:15 pm | Permalink

    Hi Terence,

    Here is the answer for your reference; you can install VUGen, Controller and LG (Load Generator, in one machine. There will not impact of this. And you can install this stuff any where on your machine that your wish J.

    Hi A True Performance Tester Says,

    You seem an over prouder, instead of sharing your knowledge, you are treating the people. Boss you are not alone a PERFORMANCE TESTER in this whole world. Pray you do not have interview with me or any of my colleagues.

    Being expert is simple, but to become an example is really tough. Learn that.

  17. Another True Performance Tester
    Posted 5/21/2008 at 7:53 pm | Permalink

    The previous posts are dead on. These “interview” questions are more like light telephone screening questions. A typical load test interview will be more conversational, not a Q & A session. More than likely, you’ll interview with at least one server or network admin who’ll ask far more technical questions than the ones posted here. No responsible client wants a novice learning on the fly with their systems. I’ve interviewed people who claimed to have so much experience. They answer the questions above with no problem, then hem and haw when I ask more technical questions.

  18. Another True Performance Tester
    Posted 5/21/2008 at 8:04 pm | Permalink

    Also, be aware that even the most ignorant interviewer knows the answers to the above questions. They have internet access just like everyone else. What they’re expecting however, is a solutions provider. At the very least, you’d be wise to have some understanding of network communication protocols, server tuning and programming. If you’re able to land a performance testing gig without those, I can assure you that you will not have your job for long.

  19. ed
    Posted 6/3/2008 at 12:03 am | Permalink

    Hello…can anybody could answer my question?

    You need to setup a scenario around the following parameters:
    - You have a maximum of 1000 vus
    - You have 10 scripts, each with an init, one action (with multiple steps) and an end. The minimum total transaction time (init+action+end) for each script is 1 minute (assume time spent in the init and end steps =0).
    - All of the odd number scripts need to generate a total of 10,000 transactions/hr
    - All the even number scripts need to generate a total of 5,000 transactions/hr
    - The number of transactions generated by scripts 1 & 3 should represent 30% of the total traffic.
    - the ramp up time for the script is 30 minutes and you want to run for 3 hrs once the ramp up is reached. You also want to use all 1000 vus. For this scenario, determine the following –
    1. # vus assigned to each script
    2. average transaction time for each script
    3. # of iterations for each script

  20. Posted 6/17/2008 at 5:05 am | Permalink

    Hi Pooja,

    When you are doing Manual correlation in Loadrunner, you need to create two identical scripts looks like same actions performed, and open one script after creating of two identical scripts and go to tools–>click wdiff tool and call to another script which is identical. here both scripts are displaying in same page, and where the differences in both scripts that part will display in YELLOW colour.here you can findout the dynamical value.and write the correlation function as web_reg_save_param(parametername, lb, rb, ord, last)
    Here leftboundary means where you find the dynamic value prefix value of the dynamic value is LEFT BOUNDARY and post fix value is RIGHT BOUNDARY, you can replace this and run the script.

  21. Bapu
    Posted 6/27/2008 at 10:28 am | Permalink

    How to solve this in VuGen - ‘Error: C interpreter runtime error: vuser_init.c (0): Error — memory violation : Exception ACCESS_VIOLATION received’

  22. LoadRunnerer
    Posted 7/4/2008 at 8:15 am | Permalink

    Answer to 71 Bapu: looks like a C programming error. Get yourself a copy of Kernighan & Ritchie!

    Answer to previous posts: stop trying to cheat with LoadRunner. You need to do the proper training and get certified, that’s like passing your driving test, you then need a lot of hands-on experience (in my case 9 years now since LR 3.51).

    You do NOT need network knowledge, that’s for networking and communications experts. It IS useful to understand data management because data issues are often underestimated in performance testing. You also need English as your first language (!) or at least a much better grasp of it than shown in many of the previous posts. I won’t be trying to operate in China any time soon because I don’t speak Chinese.

  23. Johnny Appleseed
    Posted 7/7/2008 at 9:57 am | Permalink

    A LoadRunner certification looks good on paper, but isn’t necessary to get work. Certification won’t hurt, but most employers are more impressed with candidates who have proven themselves in the real-world more than individuals who have been trained in controlled environments.

    Second, be wary of any advice suggesting that network knowledge is unnecessary. I personally would not hire a performance tester that did not have some networking knowledge. You do not have to be an expert, but effective stress testing and analysis can’t be performed without a good understanding of networking principals.

  24. Suresh
    Posted 7/8/2008 at 10:39 am | Permalink

    Why Correlation?
    what is the use of Correlation?

    where exactly it is useful?

  25. Omri
    Posted 7/8/2008 at 10:57 am | Permalink

    “memory violation” in VUgen are VUgen bugs 19/20 times and the patronizing answer about Kernighan & Ritchie has nothing to do with this. usually, copying the same VUgen script to a new script will solve the problem. My guess is that something in the original script is corrupted.

  26. Johnny Appleseed
    Posted 7/8/2008 at 2:38 pm | Permalink

    Bapu…You might also try changing the data type (int, long, char, etc.) for whatever variable you have declared on the line where the error is located.

  27. Johnny Appleseed
    Posted 7/8/2008 at 2:54 pm | Permalink

    Suresh…Correlation is used to capture dynamic values. For example, when two users access the same web page, they will most likely have different session IDs. Without correlating, all running vusers will use the same recorded session ID when the script is replayed. In most cases (especially with server-side caching), your script will fail once the second user starts running.

  28. Suresh
    Posted 7/9/2008 at 9:46 am | Permalink

    thanks johnny………

    which is the better script(Vb,C)to use in LoadRunner?

  29. Suresh
    Posted 7/9/2008 at 9:50 am | Permalink

    Hi jhonny

    which method is used normally in loadRunner Record and Playback or we need to write our own script manually.

  30. Johnny Appleseed
    Posted 7/9/2008 at 11:34 am | Permalink

    Suresh…To answer your first question, I always felt it was best to script in the language you feel more comfortable with.

    As for your second question, normally, you will record you actions (which automatically generate a script) and then make custom edits to it. Scripting manually from beginning to end is difficult because of the different variables sent and received. At the same time, in most cases, you cannot just record and playback a script because many of the values sent and received are unique to the recorded session.

  31. Suresh
    Posted 7/9/2008 at 5:56 pm | Permalink

    what does load generators in Controller do?

    Is it necessary to connect them every time we start senario?

  32. Suresh
    Posted 7/15/2008 at 3:53 pm | Permalink

    Hi jhonny

    what does load generators in Controller do?

    Is it necessary to connect them every time we start senario?

  33. Suresh
    Posted 7/25/2008 at 11:53 am | Permalink

    Can anyone help me……..

    what does load generators in Controller do?

    Is it necessary to connect them every time we start senario?

  34. Posted 7/29/2008 at 8:04 am | Permalink

    1. When I run with 10 users I am not getting any error. But when run with more than 10 users-Loading all users simultaneously there is error “Error-26377:No match found for the requested parameter”.
    2. Then I change the schedule to- ramp up every user after 5 seconds- and run the same scenario for 25 users- there is no error.
    But in the report it shows maximum running vusers as 3.
    Is it the correct method to load?
    3. Also if I want to run for ‘n’ of users for load, do I need to have so many username/password parameters?
    Can somebody answer these questions?

  35. Posted 9/10/2008 at 5:14 am | Permalink


    I would like to know how to create a script using Loadrunner for uploading of files on to the FTP server.
    I am able to record the login and the logout but not able to record the actual upload of files.
    One –can we create such a script using Loadrunner?
    Second–Can we use ftp_put and ftp_get functions for this ?

  36. Raghu
    Posted 9/15/2008 at 2:17 pm | Permalink

    I am getting below error when running script from My Local Machine. I am not seeing this problem if i ran the script using remote machine. Please let me know the solution.
    Error -26366: “Text=Welcome” not found for web_reg_find [MsgId: MERR-26366]
    Action2_welcome.c(45): Error -26377: No match found for the requested parameter “WCSParam_Diff1″. Check whether the requested boundaries exist in the response data. Also, if the data you want to save exceeds 256 bytes, use web_set_max_html_param_len to increase the parameter size [MsgId: MERR-26377]
    Action2_welcome.c(45): web_url(”Welcome”) highest severity level was “ERROR”, 705 body bytes, 1292 header bytes [MsgId: MMSG-26388]

  37. Madhusmita
    Posted 12/11/2008 at 3:55 am | Permalink

    after running the scenario ,i am geting Action.c(49): Error -27995: Requested link (”Text=Create Domestic TR”) not found

    please give the solution…

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