Performance Testing, LoadRunner Tips&Tricks

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Scripts: Auto or Manual Correlation?

Vugen comes with a nice feature called "Auto-Correlation Studio" in it. This, helps to detect changes on the recorded and replay scripts.

However, sometimes, the auto-correlation does not work as successfully as it is designed. It may not detect over sized dynamic values such as VIEWSTATE (KB 24264) or header information or cookies, etc. Well, to sum up, it varies and may not work.

Manual Correlation is just the good-old method of correlation without any studio gimicks. This although slow, provides you a better "control" of what is needed to be correlated. You can download the document relating to correlation in KB 11806.

My suggestions for those new to correlation:
  1. Do not overly depend on auto-correlation studio
  2. If replay fail, look at the Replay Log to determine the cause. Replay log provides a vast amount of information.
  3. If manual correlation is needed, perform each dynamic value one at a time progressively. In this way, it minimises the risk of missin out any dynamic value.

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9 Responses to “Scripts: Auto or Manual Correlation?”

  1. # Blogger VenkY


    Can you explain with examples how to create Auto correlation?  

  2. # Blogger Hs

    There isn't an exact example of Auto-Correlation. Auto-Correlation is a feature that is inbuilt in Vugen. It can be found in the top-right hand corner as two arrows in blue and purple(or red) in a circulated manner. Click on it after a replay of the script will detect any dynamic values for correlation.

    If you need to know more, you can start off with the Vugen User Guide which can offer you some idea of the feature too. :)  

  3. # Blogger Dmitry Motevich

    The visual tutorial explains - what is LoadRunner correlation and how to perform it.
    There are screenshots, which simpllify understanding of LoadRunner correlation.  

  4. # Blogger Hs

    Thanks for sharing! :)  

  5. # Anonymous Anonymous

    The auto correlating may be good to start, however you will probably end up with manual correlation. Lately I use this approach - no auto correlation. after first recording I identify suspitious strings or I records twice the same scripts and compare (so far no news), but once I found a correlation and I tested it I "save" it into correlation rules - everyone. So, at the end I record the script using my correlation rule file. The thing is, that there may be changes in application, environment, that cannot be parameterised, then you may quickly re-record the scrips, copy+paste enhancements.....You get the idea. I found this approach very useful on NetWeaver application, which had ID of fields, buttons dynamicly generated..... Good luck to all of you. Ladislav P.  

  6. # Blogger QTP Expert


    Thanx for sharing. Its a very nice blog and my good wishes are with the blog owner.


  7. # Blogger Sahithi

    Please give a detailed step by step instructions to do a manual correlation. It would be very helpful for the beginners.  

  8. # Blogger Sahithi

    hi dmitry motevich,

    the link providd by you helps alot... but for me as a beginner...confuses me alot.... like when we have to compare the script... and after complied script or...we need to record the script for 2 times to compare scripts... Please clear this small confusions... your help would be appreciated.  

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