Parameterizing is direct impact on performance test results, if performance tester not parameterize the script then response times should vary. Many of the performance tester are not doing parameterize during performance testing this is not at all recommended. Because performance testing should be realistic, so performance tester need to thing as end user of the application. Then application goes well in production.
What is parametrization?
Parameterization: Passing multiple values to the server is called Parameterization.
Why Parameterization required?
1.Through the use of different parameter values, you can avoid database caching. Means
If we send same user name & password multiple times to a website , Data base server keep the details in Buffer and fetch the information from the buffer due to this response times are not realistic. Beacuse in real world scenario each user logins with unique user credentials, so data should be fetch from DB data files(hard disk) not from buffers.
In Oracle most recent data kept in Buffer, so if user login and performed some activities, oracle kees the information in Buffer(DB block buffer), if i loged in scecond time data should get from buffer.
2.Your application might not allow a user to be logged on more than once simultaneously.
3. For mitigating realist scenario means in real word users are login with different ids but in our script we are login with same Id for different users. this is not real world scenario for this using Parameterization concept we are mitigating real word scenarios
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