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#ask-questions
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# ask-questions
w

wonderful-xylophone-6904

12/07/2021, 6:50 PM
Is the window.GROWTHBOOK_CONFIG definition on client side optional?
i.e. I don't have Segment, Mixpanel etc. set up
so assuming I should still be able to run my experiments
f

future-teacher-7046

12/07/2021, 6:52 PM
Without a tracking callback, the experiment would run, but you would have no way to know how it's doing.
GrowthBook does not do any event tracking and relies on you having some sort of analytics system set up already.
w

wonderful-xylophone-6904

12/07/2021, 6:54 PM
ok so it's the tracking JS which populates the db tables
I hven't evern setup ab tracking before so apologize for basic questions
f

future-teacher-7046

12/07/2021, 6:57 PM
yes, that's correct. So if you are using MySQL for example, you would have code in your trackingCallback that adds a row to MySQL that includes a user identifier and which experiment/variation they saw.
Then, you would also need to add additional rows to MySQL for conversion events you care about. For example, when someone purchases something.
w

wonderful-xylophone-6904

12/07/2021, 6:59 PM
makes a lot of sense
thanks, was wondering how does the app know anything about my data model
f

future-teacher-7046

12/07/2021, 7:00 PM
Event tracking is pretty hard to build yourself from scratch, so we recommend using a tool like https://jitsu.com/
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