CAS CAS Performance Optimization and Troubleshooting 3

Question 1

What is the purpose of a circuit breaker pattern in a CAS application's architecture?

Accepted Answer

To stop cascading failures by halting calls to a failing downstream service

Answer

To encrypt data in transit

Answer

To balance load across database replicas

Answer

To compress HTTP responses

Question 2

Which metric best measures the actual user-perceived performance of a CAS web application?

Accepted Answer

Time to first meaningful paint (FMP)

Answer

Server CPU utilization percentage

Answer

Total bytes transferred per second

Answer

Number of database connections open

Question 3

In CAS performance optimization, what is the primary goal of database connection pooling?

Accepted Answer

To reuse existing connections instead of creating a new one for every request

Answer

To encrypt database credentials

Answer

To replicate data across multiple databases

Answer

To audit all SQL queries automatically

Question 4

A CAS application log shows frequent OutOfMemoryError exceptions. What is the most likely root cause?

Accepted Answer

Objects are being created faster than they are garbage collected or heap size is misconfigured

Answer

Disk I/O bottleneck

Answer

Network timeout misconfiguration

Answer

Incorrect SSL certificate

Question 5

Which approach best reduces I/O wait time when a CAS application writes large volumes of log data?

Accepted Answer

Buffering log writes and flushing asynchronously in batches

Answer

Writing logs synchronously after every transaction

Answer

Storing logs in the primary database tables

Answer

Disabling logging entirely in production

Question 6

What does 'horizontal scaling' mean in the context of CAS application performance?

Accepted Answer

Adding more server instances to distribute the load

Answer

Increasing the CPU and RAM of an existing server

Answer

Expanding the application's database storage

Answer

Upgrading the application to a newer version