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

Debugging

Let me tell you a story….

Talking to customer be like…

Trying to guide the customer be like…

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

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

Configuration Error

Syntax Error

Logical Error

Runtime Error

Let's dig into Debugger tools

Console

Network

Breakpoints

If nothing works then…

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.

Last but not least

Discuss your bug with a rubber duck
or colleague….

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……

Communication

How to communicate bug…the better way

Share all possible things you can

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

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

SQL

Joins

How does database run your query…

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