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lr_start_transaction Usage and Dynamic Transactions Generating withExamples

Why do you use lr_start_transaction?

It is mainly used to check the response time of a particular request. Enter or, how much time Google or Bing has taken to load the page.

How to use lr_start_transaction?

lr_start_transaction to be inserted before beginning of a request/transaction, which you need to analyse the request/transaction. Lr_start_transaction and lr_end_transaction are inserted before and after the request. Each lr_start_transaction must have corresponding lr_end_transaction, otherwise vugen will consider as illegal statement.

Note: Do not use period(.) in transaction names. Period indicates end of transaction in vugen and analysis.

In this following example, lr_start_transaction starts a transaction whose purpose is to measure the response time of (How much time it take to load a page).

 "TargetBrowser=Loadrunnerz Home Page",
 LAST );
 lr_start_transaction(Loadrunnerz_Home_Page, LR_AUTO);

Once you run the script it will show you the response time of a transaction in output window.

How to Create Dynamic Transaction Names in Vugen:

Declare a buffer to store the dynamic searched string from the parameter. Put the buffer in the lr_start_transaction and lr_end_transaction function as the name of the transaction.


I created a parameter StepName in parameter and entered the values.


 char buffer[30];
 sprintf(buffer, "ScriptName_%s", lr_eval_string("{StepName}"));
 lr_start_transaction (buffer);
 lr_end_transaction (buffer, LR_AUTO);
 return 0;

If you are looping the transaction and would like see that in the Analysis, each transaction from a different iteration is reported as a separate entry, you can also insert a count to the transaction name.

Action() {
 char buffer[20];
 int count;
 for( count=1; count<10; count++){
 sprintf(buffer, "ScriptName_%s_%d", lr_eval_string("{StepName}"), count);
 "Name=keyword", "Value=loadrunnerz",
 lr_end_transaction(buffer, LR_AUTO);
 count ++;
 return 0;


  1. Please correct the below line, It was wrongly mentioned in the above screenshot
    lr_start_transaction(Loadrunnerz_Home_Page, LR_AUTO);

    1. Correct. it should be: lr_end_transaction(Loadrunnerz_Home_Page, LR_AUTO);



  2. hi sir, i have 2 questions regarding transactions

    1. which function is used to end a nested transaction?

    2. what is the difference between transaction and transaction instance?


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