Performance Engineering Interview Questions #19

Following are the Performance Engineering Interview Questions Set #19.

Q. 91 How does the “Top Timed Events” section help in identifying bottlenecks?

Ans: It lists the wait events that consumed the most time during the snapshot period, allowing you to focus on the most significant performance inhibitors.

Q. 92 What is the significance of the ‘Time Model Statistics’ section?

Ans: It provides a breakdown of where the database spent time during processing, such as in parsing, execution, or commit operations, helping identify areas that may need optimization.

Q. 93 How can the “Advisory Statistics” in the AWR report guide performance tuning?

Ans: Advisory sections like “Buffer Cache Advisory” and “PGA Memory Advisory” offer recommendations on memory sizing based on simulated workloads, helping you adjust settings for optimal performance.

Q. 94 What does the ‘Wait Class’ breakdown in the AWR report indicate?

Ans: It categorizes wait events into classes (e.g., User I/O, System I/O, Concurrency) and shows the proportion of total wait time for each class, aiding in identifying systemic issues.

Q. 95 How can ‘OS Statistics’ in the AWR report contribute to performance analysis?

Ans: It provides insights into system-level resource usage, such as CPU and memory utilization, which helps determine if performance issues are due to database configuration or underlying hardware constraints.