DBMS

What this skill is about

Schema design · transactions · indexes · concurrency

Topics we drill

• Normalisation forms
• Transactions + isolation levels
• Indexing strategies (B-tree, hash)
• Concurrency control (MVCC, locking)
• Query optimisation basics

Why this matters at interviews

Real interviewers don’t just check if you know the syntax — they probe whether you’ve used the concept under production pressure. Our drills mirror that. Adaptive difficulty, named anti-patterns called out as you go, and a senior-staff voice that teaches the production vocabulary rather than dumbing it down.