i was checking few tableau blogs and came across some information related to this.Tableau experts let me know if this makes sense to give a try.

1)login to tableau server from my local machine using

tabcmd login -s http://<host>:<port> -u <username> -p <password>

2) Below export exports the data used in the viz to a csv and places it in local directory

tabcmd export "/views/Wow/SummaryReports" -f "progressReport.csv"

3)By using some scripting i can read data from csv and insert into my target database.

let me know if anyone of you tried this and did it work? 

This worked.

We have the feasibility to pass parameter as filters to run view and export data for that particular filter.

proposed this to my client,awaiting a positive reply