Rajkumar Thangavel

Rajkumar Thangavel

#dataengineering

Articles tagged with #dataengineering

The Duplicate Order Bug That Should Have Never Happened
A checkout bug once slipped into production. A customer placed an order with three items.But the order record showed the same product twice. Not two quantities. Two rows. The UI didn’t show it clearly
Mar 15, 20266 min read3
The Schema Decision That Cost Us Performance (And Could’ve Cost Us Money)
A practical deep dive into MySQL data types, covering INT, DECIMAL, CHAR, VARCHAR, DATETIME, and TIMESTAMP with real-world production insights.
Mar 4, 20268 min read4
Why Every Senior Dev Needs to Master MySQL’s CTAS Trick
Learn how CTAS, temporary tables, CTEs, ALTER operations, and efficient filtering can turn data headaches into smooth production workflows.
Jan 31, 20267 min read14