CAS CAS Performance Optimization and Troubleshooting 1 — Questions and Answers
Question 1: Which technique is most effective for reducing application response time when database queries are the primary bottleneck in a CAS-certified application?
- Adding more application servers
- Implementing query result caching (Correct answer)
- Increasing network bandwidth
- Upgrading the operating system
Correct answer: Implementing query result caching
Implementing query result caching reduces repeated database hits and significantly lowers response times when queries are the bottleneck.
Question 2: In CAS application troubleshooting, what does a high CPU utilization combined with low memory usage typically indicate?
- Memory leak in the application
- Inefficient algorithms or compute-intensive processes (Correct answer)
- Network latency issues
- Insufficient disk I/O capacity
Correct answer: Inefficient algorithms or compute-intensive processes
High CPU with low memory usage points to inefficient algorithms or tight loops that consume processor cycles without requiring large data buffers.
Question 3: Which load testing metric is most critical for establishing performance baselines in a CAS application deployment?
- Number of concurrent users at peak throughput with acceptable response time (Correct answer)
- Total number of HTTP requests per day
- Average session duration
- Peak memory consumption during idle state
Correct answer: Number of concurrent users at peak throughput with acceptable response time
Concurrent users at peak throughput with acceptable response time defines the system's capacity boundary and is the core baseline metric.
Question 4: What is the purpose of profiling an application during CAS performance optimization?
- To document user stories
- To identify code hotspots consuming the most execution time (Correct answer)
- To generate automated test cases
- To configure load balancer rules
Correct answer: To identify code hotspots consuming the most execution time
Profiling instruments the running application to pinpoint which functions or code paths consume the most CPU and memory resources.
Question 5: During CAS application troubleshooting, an error log shows repeated 'connection pool exhausted' messages. What is the most appropriate first step?
- Restart the application server immediately
- Increase the maximum connection pool size after analyzing current usage patterns (Correct answer)
- Switch to a different database engine
- Disable connection pooling entirely
Correct answer: Increase the maximum connection pool size after analyzing current usage patterns
Analyzing current usage patterns first ensures the pool size increase is appropriate and rules out connection leaks before tuning the limit.
Question 6: Which caching strategy stores precomputed results at the time data is written rather than when it is first requested?
- Lazy loading
- Write-through caching (Correct answer)
- Cache-aside pattern
- Read-through caching
Correct answer: Write-through caching
Write-through caching updates the cache simultaneously when data is written, ensuring the cache always holds current values without a first-request miss.
CAS CAS Performance Optimization and Troubleshooting 1
Which technique is most effective for reducing application response time when database queries are the primary bottleneck in a CAS-certified application?