Google Professional Cloud Database Engineer Question 60
Single answerGoogle Cloud PlatformYou are managing a Cloud SQL PostgreSQL database that experiences a high volume of short-lived connections due to a web application with many concurrent users. The database performance is degrading because of the overhead caused by frequent connection establishment and teardown. How can you optimize the database performance in this scenario?
- A
Implement a session pooler service like PgBouncer to handle connection pooling.
- B
Increase the instance size of the Cloud SQL database to handle more connections.
- C
Enable read replicas to distribute the connection load across multiple replicas.
- D
Migrate the database to a NoSQL solution like Cloud Firestore to reduce connection overhead.
Show answer and explanation
Correct answer: A
Explanation
The overhead caused by frequent connection establishment and teardown can significantly impact database performance, especially in high-concurrency scenarios. A session pooler service like PgBouncer is designed to mitigate this problem by reusing connections from a pool, reducing the load on the database and improving performance. Other options either do not address the root cause or require significant changes to the architecture.
- A. Correct.
Implementing a session pooler service like PgBouncer is the correct approach. Session poolers create and manage a pool of database connections, reusing them across multiple client requests. This reduces the overhead caused by frequent connection establishment and teardown, making it an optimal solution for this scenario.
- B. Incorrect.
Increasing the instance size might temporarily alleviate the issue but does not address the root cause, which is the frequent creation and teardown of connections. Without connection pooling, the problem will persist even with a larger instance.
- C. Incorrect.
Read replicas are used to distribute read operations and improve scalability, but they do not address the issue of frequent connection overhead caused by short-lived connections.
- D. Incorrect.
Migrating to a NoSQL solution like Cloud Firestore is not a suitable solution in this case, as the problem lies with connection management, not database type. Additionally, this would require a significant architectural change and may not meet the application's requirements.