Exam Professional Data Engineer topic 1 question 239 discussion

- BigQuery allows you to specify job priority as either BATCH or INTERACTIVE. - Batch queries are queued and then started when idle resources are available, making them suitable for non-time-sensitive workloads. - Running ad-hoc queries as interactive ensures they have prompt access to resources.

This question has nothing to do with increasing slots, it is just confusing and misleading, therefore A and C do not make sense. D (All interactive queries): Running all queries as interactive would prioritize speed over cost-efficiency and might not be necessary for your non-time-sensitive SQL pipelines.

You already have a 2000 slots consumption and sudden peaks, so you should use a baseline of 2000 slots and a maximum of 3000 to tackle the peak concurrent activity. https://cloud.google.com/bigquery/docs/slots-autoscaling-intro

Why A is the best choice: Addresses Concurrency: Increasing the maximum reservation size to 3000 slots directly addresses the concurrency issue by providing more capacity for simultaneous queries. Since the current peak usage is 1500 queries, this increase ensures sufficient headroom. Cost Optimization: Setting the baseline to 0 means you only pay for the slots actually used, avoiding unnecessary costs for idle capacity. This is ideal for non-time-sensitive workloads where flexibility is more important than guaranteed instant availability.

Option B

B. Update SQL pipelines to run as a batch query, and run ad-hoc queries as interactive query jobs.