1 of 1 people found this helpful
Here we have 2 Scenario.
Case 1 : Live Connection
Absolutely yes, It will improve performance of SQL queries.
Case 2 : Extract
There is no impact on extract file, Because tableau store data in his own format.
Tableau has nothing to do with table till the time tableau fetching data from extract.
However but we can’t ignore Index because while refreshing data extract it matter a lot.
Extract refresh is much more faster than compare to without index table.