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DBMS
ER modelling, SQL, normalization, transactions, concurrency, indexing and recovery.
10 focused questions • instant score • challenge a friend
DBMS — 10 question drill
Questions are loaded from the public question bank; AI fills the gap when needed.
1/10Topic drill
Mock tests
After this focused drill, continue to the exam-level public quiz and free-marked mock practice.
Start full exam quiz →5-day study plan
Use the plan below as a compact revision loop. Adjust the time to your own preparation schedule.
Free learning route
Read the topic checklist, attempt the drill, inspect your mistakes, then revisit the official/source-linked resources from the exam hub.
1
Learn the core model or definition.
2
Practice common question patterns.
3
Re-test after review.
QUALITY LEARNING LAYER
Dbms — concept-first revision
Understand the concept, check the trap, then return to the live focused quiz above.
What this topic covers
- Relational model: relations, tuples, attributes and keys.
- Normalization: 1NF, 2NF, 3NF and BCNF as tools for reducing update anomalies.
- Transactions and ACID: atomicity, consistency, isolation and durability.
- SQL: filtering, joins, grouping, subqueries and data-definition/manipulation basics.
- Indexing and query performance: understand why an index can speed lookups but adds storage/write cost.
Common exam traps
- Confusing candidate key with primary key.
- Treating 3NF as a synonym for normalization in general.
- Mixing WHERE filtering with HAVING aggregation filtering.
- Assuming every index automatically improves every query.
How to study it on ExamCracker
- Read the core concepts and examples.
- Attempt the focused public practice on the related exam hub.
- Review every incorrect answer instead of only checking the score.
- Return to the topic before moving to a full-length mock.
Quick check
Quick check: Which normal form is defined by the elimination of partial dependency on a composite candidate key?
- A. 1NF
- B. 2NF
- C. 3NF
- D. BCNF
Answer: 2NF
Why: Partial dependency is the issue addressed by Second Normal Form. A relation in 2NF is already in 1NF and has no partial dependency of a non-key attribute on part of a candidate key.
Why: Partial dependency is the issue addressed by Second Normal Form. A relation in 2NF is already in 1NF and has no partial dependency of a non-key attribute on part of a candidate key.
Why this page exists
This is a focused learning page, not a keyword-only article. It connects an exam concept to practice, related resources and the broader ExamCracker preparation flow.