GCP Professional Data Engineer Practice Question

Your organization runs a Dataflow streaming job that continuously writes events into an existing BigQuery dataset containing sensitive customer information. Security policy mandates least-privilege access for the Dataflow worker service account: it must be able to create new tables in that dataset and append or overwrite rows, but it must not change table schemas or manage dataset-level access controls. You need to grant a single predefined IAM role on the dataset to satisfy this requirement. Which role should you assign?

Grant roles/bigquery.dataEditor on the dataset
Grant roles/bigquery.admin on the project
Grant roles/bigquery.dataOwner on the dataset
Grant roles/bigquery.jobUser on the project

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Answer Description

The BigQuery Data Editor role (roles/bigquery.dataEditor) is scoped to datasets and grants permissions such as bigquery.tables.create and bigquery.tables.updateData, which allow a principal to create tables and write rows. Although it also includes bigquery.tables.getData (read access), it does not include permissions like bigquery.tables.update (alter table schemas) or bigquery.datasets.update (change access controls). Thus it provides the minimum required capabilities without granting schema-modification rights. BigQuery Data Owner and BigQuery Admin include schema and access-control permissions, violating least privilege. BigQuery Data Viewer is read-only, and BigQuery Job User controls job execution but provides no direct dataset write permissions. Therefore granting roles/bigquery.dataEditor on the dataset is the correct choice.

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