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Why is there a time delay between the time I hit “Update Now” in Tableau and the time when the job starts in Spark?

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There are no of processes happens when you click from application process and you see result of vizql, lag may be because of unoptimized query developed by developer but still getting what ask requires tableau process multiple things just because of this you may see a lag with big dataset
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My name is Rajesh , working as a Recruiter from past 6 years and thought to change my career into software (development / admin/ testing ) am seeking for some suggestion which technology I need to learn ? Any job after training ? Or where I can get job within 3 months after finishing my training programme- your advices are highly appreciated
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What will be the future scope of tableau in the coming years. I am from non technical background and planning to learn tableau. Will it have a good demand in job market for the next 5 years?. 

Srihari,Tableau has excellent prospects from job demand and skill utilization perspective. That said, it is a data visualization tool. So just being a "Tableau skilled" position may not differentiate you...
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