Seed Data – Unique Values Changing Inside the Iteration

Document created by Salvador Camacho Reyes Employee on Jul 24, 2017Last modified by Dave Murphy on Jul 26, 2017
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Example Use Case: We have 100 users and they’ll be using data that can only be used once (meaning the application will not accept that data again, unless of course it is “reset” by the application team). We want that each “instance” of the seed data object inside the clip is assigned a unique value and that it changes from instance to instance. There can be other use cases where we just want this even though the data can be used several times.


This would be something similar to LoadRunner Select next row: Unique and Update value on: Each occurrence.


For setting this up, you’ll need to declare a property in a collection (page, transaction, chain, etc.) that has the message where the value is used. Every seed data declaration is known in SOASTA as an “instance” of that object. You’ll need to create as many properties (instances) as new values from this property you want. These properties must be created in the collection that nests the message that has the value. You can change the other settings depending on your needs, as for this example I’ve left the default values.


Check “Save value for analytics” to see the values used after the composition is played with the widget “Property Value Composition Analysis”. You can change the other settings depending on your needs. The most important of these settings is the EOF option. As for this example I’ve left the default values.


This setup works for a composition that uses the two most common setups: Infinite Clip Repeats (Renew Parallel Repeats Disabled for the Track, first image below) and Renew Parallel Repeats Enabled for the Track (Clip Repeats Disabled, second image below).


Find attached a composition with the second configuration (using Renew Parallel Repeats). Since it is set to renew parallel repeat, it will run infinitely, make sure to stop it after some iterations have completed to see the behavior. The composition is set to “Preview Mode”, meaning it will not be sending any traffic to the target but it will compute the seed data distribution. The attached composition has three properties declared in Group1, Transaction1 and Page3 and Page4 inside Transaction2