How you can effectively debug and solve Software issues.

1. Effective Techniques
debugging,communication,sql,... life

9. Debugging

10. Let me tell you a story….

13. Talking to customer be like…

15. Trying to guide the customer be like…

17. Let's dig in and at least try to classify bugs…

18. Types of Errors
- Configuration Errors
- Syntax Errors
- Logical Errors
- Runtime Errors

19. Configuration Error

21. Syntax Error

23. Logical Error

25. Runtime Error

28. Let's dig into Debugger tools

29. Console

30. Network

31. Breakpoints

32. If nothing works then…

35. How should we approach these …
- Application Reachability issue
- Check if Application is running
- Check if request is received in nginx log
- Check if there is any antivirus installed
- Check if respective ports are open
- Ask the network team to check
- 500 error is displayed
- Check the server.log for any dbutils.SQL
or connection issue.
- Collect all the logs using product cli
command
- Collect thread dump using product cli
command
- Application is running Slow
- Check if any log size has been increased
drastically.
- Collect all the logs using product cli
command
- Collect application server CPU usage
- Collect db server cpu usage
- Collect awr, addm oracle reports
- Create HAR file of the application
- If things were working day before
yesterday and now they are not
- Check if browser is upgraded
- Check if os level patches were applied on
application / database server
- Check if any network firewall change
activity were conducted.

36. Last but not least

37. Discuss your bug with a rubber duck
or colleague….

38. Keep in mind….
Things will get difficult….try to find a clue.
You will get frustrated - TAKE A BREAK.
Step away from the problem .. go for a walk(not vacation)..sleep on it… get some
exercise… come back and you will have new insights….
Ask for Help!!!!
There might be a race condition causing the bug……

39. Communication

41. How to communicate bug…the better way

43. Share all possible things you can

44. Replicable Issues
- Replication Step with screenshots
- Video is better
- Actual Result Vs Expected Result with calculations
- All Application Log files
- Patch Number
- Replicate on AWS source

45. Non Replicable Issues
- Explain whole scenario and story with screenshots
- Try and Isolate the issue
- Show System Video if possible
- Get Master Data involved in Replicable issue
- Get Configuration
- Actual Result Vs Expected Result
- All Application Log files
- Current System Patch Number
- Check if new logs can be added with discussion with developer.
- Team Work

47. SQL

50. Joins

52. How does database run your query…

55. Ninja SQL Queries…
Steps to Kill a session
Steps to cancel an SQL statement
Flush shared pool
Explain plan for a query
Top queries by CPU
Top Elapsed Queries with Text
Check Locked tables
These queries are available in Cloud Tracker - Document Project