Preparing Practice Exam…
Please wait a moment while the system generates the exam questions, answers, and study session.
Please wait a moment while the system generates the exam questions, answers, and study session.
Databricks Certified Machine Learning Professional · Databricks
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
- Correct answer : A — The name of the column in the label DataFrame containing the timestamp against which the feature table's time series values are matched. A . `timestamp_lookup_key` names the column on the label/spine DataFrame holding each row's own timestamp, which the as-of join compares against the feature table's timestamp key to find the correct historical value per row. B . Write time to the Delta table is unrelated to `timestamp_lookup_key`; the parameter refers to a column on the label DataFrame, not metadata about when feature rows were physically ingested. C . The parameter is per-row, not a single fixed cutoff — every label row can carry its own distinct timestamp, and the join is evaluated independently for each one. D . Publishing cadence for online tables is controlled by scheduling policies like `TRIGGERED` or `CONTINUOUS`, which are unrelated to `timestamp_lookup_key` and to training-set construction entirely.