CAS CAS Performance Optimization and Troubleshooting 2 — Questions and Answers
Question 1: A CAS application experiences intermittent slow responses only during business hours. Which diagnostic approach best isolates the cause?
- Reboot servers every morning
- Correlate performance metrics with concurrent user counts and scheduled jobs during those hours (Correct answer)
- Increase all server resources immediately
- Disable background processes permanently
Correct answer: Correlate performance metrics with concurrent user counts and scheduled jobs during those hours
Correlating metrics with user load and scheduled jobs during peak hours identifies whether the slowdown is load-driven or triggered by a competing process.
Question 2: What is the primary benefit of using asynchronous processing for long-running tasks in a CAS application?
- Simplifies error handling
- Frees the main thread to handle additional requests while background work completes (Correct answer)
- Reduces total processing time
- Eliminates the need for task queues
Correct answer: Frees the main thread to handle additional requests while background work completes
Asynchronous processing offloads long-running work so the main thread remains available to accept and process new incoming requests.
Question 3: In CAS application monitoring, which type of alert threshold strategy minimizes false positives caused by brief traffic spikes?
- Instantaneous threshold alerts
- Sustained threshold alerts over a rolling time window (Correct answer)
- Static maximum value alerts
- Alert only during business hours
Correct answer: Sustained threshold alerts over a rolling time window
Sustained threshold alerts over a rolling window require the metric to exceed limits for a defined period, filtering out transient spikes.
Question 4: Which database index type is most beneficial for optimizing range queries on timestamp columns in a CAS application?
- Hash index
- Full-text index
- B-tree index (Correct answer)
- Bitmap index
Correct answer: B-tree index
B-tree indexes maintain sorted order, making them ideal for range queries that retrieve records between two timestamp values.
Question 5: What does the term 'garbage collection pause' refer to in the context of CAS application performance?
- Time spent archiving old log files
- A stop-the-world pause while the runtime reclaims unused memory objects (Correct answer)
- Delay caused by network packet loss
- Scheduled downtime for database maintenance
Correct answer: A stop-the-world pause while the runtime reclaims unused memory objects
Garbage collection pauses occur when the runtime halts application execution to identify and free unreachable memory objects.
Question 6: When troubleshooting a memory leak in a CAS application, which tool category provides the most actionable data?
- Network packet analyzers
- Heap dump analyzers (Correct answer)
- Load balancer logs
- DNS lookup utilities
Correct answer: Heap dump analyzers
Heap dump analyzers inspect the contents of memory at a snapshot in time, revealing which objects are accumulating and not being released.
CAS CAS Performance Optimization and Troubleshooting 2
A CAS application experiences intermittent slow responses only during business hours.
Which diagnostic approach best isolates the cause?