Skip to main content

Different Ways to do Correlation in Loadrunner You Must Know

1. Generation Log

One of the common options in loadrunner is generation log. You will take the left and right boundary and search in the generation log and use CTRL+F and find the request name and place the web_reg_save_param before that request.

2. Replay Log

Sometime you do not find correlation value in generation log than the alternative way is go to run time settings and click on Log->Extended Log-> "Data Returned by Server" option and replay the script. Once you replay the script you will use CTRL+F and find the left and right boundaries. Sometimes replay log may fail or it will take a long time if you select “data returned by server” as it is printing all the response to the replay log then the alternate method to use is  lr_set_debug_message as shown in this link.

3. Redirection

If you are not able to find the value in generation log and replay log then there might be 301 or 302 redirection.  Find out the pages that have 301 or 302 redirection. Once you find the pages that have 301 redirection go to that page manually in your browser, try to find the left and right boundary values by using view source (Left Click on the page -> "View Page Source" in chrome and "View Source" in internet explorer).

4. Text Flags:

Sometime you find the value, but the left and right boundaries will by changing dynamically then the alternate option is using text flags SaveLen and SaveOffset.

5. Automatic Correlation (Design Studio):

One of the best method that has from loadrunner 11.5 and loadrunner 12 is updated automatic correlation called design studio. It has improved a lot from this version. You can do the scripting at a faster pace by using this option.

Once you record the application go to Design-> Design Studio. The Design Studio will highlight the different values that need to be done correlation. Based on our requirement, we will select the value click on correlate value. We can also add it as “Add as Rule”. It will be easy if we are reusing the correlation in other scripts.

Note: Make sure you select the following option:

Go to Recording Options ->Correlation->Configuration-API and select web_reg_save_param_ex.  You can also use web_reg_save_param_regexp as well. I prefer using web_reg_save_param_ex.

At last please add up if you know any other option to get a correlation value that helps other readers.


Popular posts from this blog

File operations in loadrunner with examples

In this post I will explain how to capture a value from server response and save to a text file using vugen. How to capture and save to text file using loadrunner: First I have recorded the script using and then i searched for IBM. We will get 10 results. I have captured all the 10 values and saved to a file. Here is the code for that.

NeoLoad Interview Questions and Answers

Here are some of the interview questions and answers on NeoLoad: What is NeoLoad? NeoLoad is a performance testing tool designed to test different types of web, standalone and mobile applications. What is the difference between Loadrunner, JMeter and NeoLoad? Click here for differences What are the different counters you monitor in NeoLoad? Average Response Time(requests), average response time(pages), average requests/s, average throughput, current response time(requests), current response time(pages), current requests, current throughput, current users count, controller cpu load, controller memory load etc. What are the different type of tools you can integrate with NeoLoad? App Dynamics, CA APM Integration, Dyna trace integration, HP ALM or Quality Center Integration, Java and Jamo Solutions M-eux Test Integration, Jenkins Integration, perfecto mobile integration, selenium integration. What are the different type of Operating systems you can mon

LR Functions with Examples | Loadrunner Functions with Examples

LR Functions in Loadrunner with Examples. lr_abort Stops the script execution. lr_advance_param It will take the next value in the parameter list. lr_continue_on_error Continue on error even if the request is failed. lr_convert_string_encoding Converts a string to a UTF 8 or Unicode. lr_db_dataset_action Validates database contents by setting checkpoints. lr_db_connect Connects to a database. lr_db_dataset_action Performs an action on a dataset. lr_db_disconnect Disconnects from a database. lr_db_executeSQLStatement Submits an SQL statement to a database. lr_checkpoint Validates the value of a parameter against an expected value (checkpoint). lr_db_getValue Retrieves a value from a dataset. lr_debug_message Sends a debug message to the LoadRunner output or Application Management agent log file. lr_decrypt Decrypts an encoded string. lr_disable_ip_spoofing Disables IP Spoofing. lr_enable_ip_spoofing Enables IP Spoofing. lr_end_sub_transaction Marks the end of a sub-tr