Google Professional Cloud Database Engineer Exam Practice Questions (P. 3)

GPT-4o - Answer

Assigning the roles/spanner.databaseAdmin role to Person A aligns perfectly because this role manages database structure and security, keeping the principle of PoLP intact. Person B requires access to read data for reports but should not alter any data, making roles/spanner.databaseReader appropriate. Although roles/spanner.backupWriter allows the creation of backups as necessary for Application C, the roles/spanner.backupAdmin role provides comprehensive management capabilities such as creating, updating, and deleting backups, enhancing adherence to strict security and operational guidelines within heavily regulated environments. Thus, the selection of roles/spanner.backupAdmin for backup tasks supports broader management and compliance strategies.

GPT-4o - Answer

To maintain high performance while minimizing costs in your Cloud Spanner deployment, it is indeed effective to utilize the Autoscaler tool. This tool dynamically adjusts the number of nodes based on actual usage demands, meticulously aligning resources with current needs without manual intervention. While the query optimizer helps with efficiently executing SQL queries, the alignment of resource provisioning will play a more pivotal role in managing expenses effectively in your scenario. Hence, leveraging the Autoscaler enables both scalability and cost-efficiency, crucial for gaming applications where workload can be variable and unpredictable.

GPT-4o - Answer

For ensuring high availability and supporting regional expansion from the US to APAC, option D is the best pick as it distributes clusters optimally between the regions. Specifically, maintaining two clusters in both the US and APAC not only increases regional coverage but also positions for efficient failover capabilities and load management. This configuration aligns well with Google's recommended practices concerning global distribution and regional failover. Thus, ensuring the system remains resilient, available, and performs efficiently across both targeted markets.

GPT-4o - Answer

The optimal solution for handling user clickstream data, given the need for low-latency with high scalability, indeed involves leveraging Bigtable. This configuration notably excels in scenarios requiring rapid reads and writes globally, making it especially suitable for clickstream data like that of an ecommerce website. Bigtable, combined with Dataproc and Apache HBase libraries, offers potent real-time analytics capabilities. This setup not only manages the data volume efficiently but also seamlessly scales to accommodate millions of read and write requests per second, aligning perfectly with the requirements for analyzing customer traffic patterns effectively.

GPT-4o - Answer

Promoting high-cardinality attributes in the primary keys (Option D) is a recommended practice because it helps distribute database load more evenly, reducing the risk of hotspots. Additionally, Option E, using a bit-reverse sequential value as the primary key, also mitigates the risk of hotspots by ensuring that newly inserted rows are spread across different servers. It's notable that employing auto-incrementing primary keys (Option A) is typically discouraged as it can increase the chances of hotspotting, contradicting the selected correct answer. This highlights an inconsistency with common guidelines on optimizing database performance with Cloud Spanner.