LoadRunner will replay a recording of client requests to the server for each virtual user. Repeating the exact same client requests for every virtual user of a given type does not yield a realistic test. No real ESS Applications installation will receive thousands of time cards from the same person with the same hours. LoadRunner's Parameter Wizard addresses this issue. It automatically detects variable data like John Smith and allows users to replace it with a variable like Employee Name.
Users can then link the variable to a file that contains many different instances of that variable.
When the test runs, LoadRunner will substitute the variable for one of the instances in the file. This feature makes load tests much more realistic. The first step in conducting load tests for the ESS Applications was to decide on what type of load to use. SAP decided to use time cards as the application. For this application, SAP created two types of virtual users.