ServiceNow Staff Performance Engineer interview questions

Service Now round 1: 1. intro/tell me about your self? 2. impact of parallel calls vs sequencial calls 3. what are the negetive effects of thread pool? 4. have you ever seen thread pool issues and how did you resolve them? 5. have you ever seen memory leak issues and how did you resolve them? 6. have you done memory or thread analysis and provided recommendations/tunings? 7. what do you use for reporting? 8. what do you consider avg or 90th or stad deviation? 9. what is the SLA for diff avg and 90th 10. List the employee names who are geeting max salary from each department 11. string qwe!@#$%^& get all the alphabets and check if its palindriome. sudo code. 12. did you tune queries or analyze awr reports what should be the DOP? 13. do you exp in client side monitoring? Service Now round 2: 1. intro/tell me about yourself? 2. References in Java 3. When the finally block gets called and what is the use? 4. What is the meaning of final key work and use of it. 5. Print prime numbers algorithm/code program is to print prime numbers between 1 to 100. 6. What are the perf issues identified in non prod that saved outrageous. 7. How do you capture list products from a response and use it in the next request. What are the tools and monitoring tools used? When the objects gets garbage collected? How do you come up with a test strategy for a brand new application? How do you identify memory leak objects and work with the dev team? What are the settings names for min max values of heap. What are different garbage collection mechanisms? Service Now round 3: Tell me about your current daily activities? What is the test strategy for an application with a shopping cart? How do you decide on the DB volume of the application? What are the cache on the CPU and purpose and usage How do you identify duplicates in a string? Time and space complexity? Thread dumps analysis? What do you look at during the test? For performance? Explain the JVM memory architecture What is context switching? Why does the cpu % shows more than 100% on any systems? If 16 core cpu is showing 400% usage what does it mean? Shell scripting and grep command? How do you monitor if there are no tools? What monitoring tools have you used? What do you monitor for thread related info? When do you intend to take thread dumps? How threads impact the system performance? What command do you use to check cpu usage on a linux system if there is no monitoring tool? What is virtual memory and its use? Can I use 180 Gbytes for heap out of 250 GB ram?