What is Correlation in Load Runner.
If possible please give an example for the same.
well reading the manual really helps in the understanding of any product...
correlation is grabbing bits of data which are returned from the server which are reused later in the script... for example
Dave logs into www.thewebsite.com
www.website.com returns it's home page... in the html there is a usersessionid 1672
when going into the next page (any every other page) the server requires that the usersessionid be sent as part of the request.
as the usersessionid is unique to the user/session then the value must be found on the first page and passed back for every other page for the script to work
this often applies to a lot of things in loadrunner, sessionids, row ids inb effect all dynamic data which is received from the server as opposed to data which can be parameterised, like username, password etc which are stored in data files
Good luck in the interview.
SmarteLoad (recently released by accordSQA) claims to do automated correlation and presentation of results. Haven't tried it, but the demo looks interesting. They also claim they can migrate scripts from other load test tools (Loadrunner etc) to SmarteLoad at the touch of a button.
If all of the above works as well as claimed it would be a major time saver. But as I say I have not tried it so I do not know how well it works.
Correlation is a development practice on educating a virtual user to manage the application handshake between client and server. This development practice is independent of LoadRunner and applies equally well to other vendors toolsets.
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