Here are some Common Pitfalls that Dorcas Alexander highlights:
Pitfall #1:
The GA connector is bound by the limits of the Google Analytics API, which means you can’t ask for more than 10,000 rows of data at a time.
Pitfall #2:
If you ask for any segment of data that GA has to calculate by searching through a really large set (500,000 sessions or more), Tableau doesn’t warn you when it returns incomplete or inaccurate, sampled data.
Pitfall #3:
You can’t use “filters” in the Google Analytics sense, at least not to reduce the volume of data in your request.
Pitfall #4:
If you ask for too many dimensions, you may get sampled data.
Google Analytics pre-aggregates certain combinations of dimensions and metrics, to produce the default set of tables also called “standard reports”. If you ask for a combination of dimensions that was not already calculated, GA has to create a brand new table. Same as with segments!
