Honestly thought I'd fail because of data connections — anyone else struggle there?

Data connections got me too on my first attempt — specifically the live vs. extract thing. I kept second-guessing myself on when Tableau would actually hit the data source versus use the cached extract, and under exam pressure that uncertainty snowballed into dumb mistakes on questions I actually knew. What finally clicked for me was building a small sandbox: I connected to the same Excel file as both live and extract, then just broke things on purpose. Filtered a field that didn't exist, joined on a mismatched data type, watched the error messages. Sounds tedious but after an hour of that I stopped having to think about it.

The other thing nobody mentioned in my study group was cross-database joins. I'd been practicing mostly on single data sources and then the exam hit me with scenarios involving multiple connections and I fumbled. Once I started specifically drilling that — setting up joins between, say, a CSV and a Google Sheets connection — it became second nature. The prep materials I was using at the time barely touched on it, so I had to seek that out intentionally.

Congrats on passing, by the way. Two attempts is pretty common for this one — the first try is almost like a paid reconnaissance mission at this point.

Two attempts — that actually makes me feel better because I'm currently studying for my first sit and data connections are exactly where I keep stumbling. Quick question if you don't mind: when you say preparation "wrecked" you, are you talking about the live connection vs. extract decision-making, or more the actual joining and blending side of things? Because I keep second-guessing myself on when Tableau is even pulling fresh data versus cached, and I'm not sure if that kind of conceptual confusion actually shows up on the exam or if it's more about knowing the steps.

The LOD stuff I feel okay about after drilling it a lot, but every time I do a tableau practice test I notice I'm losing points on questions about data source filters and connection types, which feels like exactly what you're describing. Like I can build a dashboard fine but the underlying infrastructure questions trip me up.

Did anything specific click for you the second time around, or was it mostly just more reps until it stopped feeling unfamiliar?

Data connections absolutely wrecked me the first time too — specifically around published data sources vs. live connections and when Tableau actually refreshes the extract. What finally clicked for me was spending a dedicated session just connecting to every source type I could find (Excel, CSV, a local PostgreSQL instance, Google Sheets) and manually walking through the join types, union behavior, and then checking how the data source tab looked afterward. Not reading about it. Actually doing it and breaking things on purpose.

The thing that made the biggest difference though was practicing cross-database joins and understanding their limitations — because on the exam they'll throw you a scenario where you have to reason about what's possible, not just click through a wizard. I kept a running doc of "gotchas" as I hit them: things like how Tableau handles null values differently depending on join type, or why a left join sometimes returns more rows than you'd expect when there are duplicate keys on the right side. Sounds obvious in hindsight but I never would've remembered it without writing it down in my own words right after the confusion hit.

Two attempts is honestly pretty normal for this cert — the first run is basically a very expensive diagnostic. You know what to study now in a way no practice guide can tell you.

Same here honestly. Data connections tripped me up way more than LODs ever did on my first attempt. I've been grinding practice sets this past week and just hit 81% on the free tableau desktop associate exploring and analyzing data section which I wasn't expecting at all. Felt like things finally clicked.

I'm booked for the 31st so less than two weeks to go. Nervous but way more confident than I was heading into attempt one. Good luck to everyone else still prepping, you've got this.

Ugh, yes. Data connections almost made me quit after my first attempt. I kept second-guessing myself on live vs extract, and when to use which, and I just blanked during the actual exam. It's one of those things where you think you get it until the pressure hits.

Second time around I drilled it specifically and it clicked. Honestly the calculated fields stuff I was more scared of ended up being fine once I stopped panicking about the connection layer. If you're still prepping, don't sleep on joins vs relationships either — that tripped up a few people I know. You've got this though, keep going.

Data connections absolutely wrecked me on my first attempt too. I spent so much time memorizing LOD syntax and then bombed questions about live vs extract connections and join types -- stuff I'd barely practiced because it felt too "basic." Almost didn't bother with the second attempt honestly, figured I just wasn't cut out for it.

What finally clicked for me was just doing it hands-on. Like actually connecting to different source types in the app, not just reading about them. It's one of those things that sounds obvious in hindsight but I kept trying to study it theoretically and it wasn't sticking. If you're struggling there, just open Tableau and mess around with actual data sources until the behavior makes sense. Took me a few weeks of that and I passed second time around pretty comfortably.