📖DBMS Notes

Database Management Systems (DBMS)

Zero-fluff engineering notes, relational algebra derivations, and high-yield interview frameworks for university semester exams, GATE CSE, and technical placement rounds.

10Modules

48Topics

100%Free Access

Basics of DBMS & Architecture

ANSI/SPARC 3-schema architecture, data independence, and DBMS vs File Systems.

1.1What is Data & DBMS? File Systems vs Database Systems→1.2Three-Schema ANSI/SPARC Architecture & Data Independence→1.3Types of Databases, DBA Roles & Data Dictionary→

Module 025 Topics

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Entity-Relationship (ER) Model

Entity sets, relationship cardinalities, weak entities, ER-to-relational mapping, and EER.

2.1Entities, Attributes & Keys: Foundations of ER Modeling→2.2Relationship Sets, Cardinality & Participation Constraints→2.3Weak Entity Sets & Identifying Relationships→2.4Step-by-Step Rules: Converting ER Diagrams into Relational Tables→2.5Extended ER (EER): Specialization, Generalization, Aggregation & ER Traps→

Module 035 Topics

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Relational Model & Relational Algebra

Tuples, schemas, candidate keys, referential integrity, selection/projection, and joins.

3.1Relational Data Model & Terminology (Tuples, Degree, Cardinality)→3.2Keys in DBMS: Super Key, Candidate Key, Primary Key & Foreign Key→3.3Integrity Constraints: Domain, Entity, and Referential Integrity→3.4Relational Algebra Operators: Selection, Projection, Cross Product, Rename→3.5Relational Joins: Natural Join, Theta Join, Outer Joins (Left, Right, Full)→

Module 045 Topics

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Structured Query Language (SQL)

DDL/DML/DCL/TCL commands, GROUP BY/HAVING aggregations, subqueries, visual joins, and CTEs.

4.1SQL Command Categories: DDL, DML, DCL, and TCL→4.2Aggregations, GROUP BY, and HAVING Clauses→4.3Nested Subqueries, Correlated Subqueries & Exists→4.4SQL Joins Master Guide with Visual Output→4.5Window Functions, CTEs, and Views→

Module 056 Topics

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Functional Dependencies (FDs)

Inference axioms, attribute closures, candidate key finding algorithms, and minimal covers.

5.1Introduction to Functional Dependencies & Trivial vs Non-Trivial FDs→5.2Armstrong's Axioms (Inference Rules)→5.3Attribute Closure Algorithm (X+)→5.4Algorithmic Method to Find All Candidate Keys→5.5Minimal / Canonical Cover of Functional Dependencies→5.6Equivalence of Functional Dependency Sets→

Module 066 Topics

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Database Normalization (1NF-5NF)

Update anomalies, 1NF to BCNF decompositions, lossless join tests, and dependency preservation.

6.1Database Anomalies: Insertion, Deletion, and Update Anomalies→6.2First Normal Form (1NF) & Second Normal Form (2NF)→6.3Third Normal Form (3NF) vs Boyce-Codd Normal Form (BCNF)→6.4Lossless Join Decomposition Testing→6.5Dependency Preserving Decomposition→6.6Multi-Valued Dependencies (4NF) & Join Dependencies (5NF)→

Module 074 Topics

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Transaction Management & ACID

Transaction states, ACID guarantees, serial vs non-serial schedules, and conflict equivalence.

7.1What is a Transaction? Transaction State Life Cycle→7.2ACID Properties Deep Dive with Banking Examples→7.3Schedules: Serial vs Non-Serial Schedules→7.4Read-Write Conflicts and Conflict Equivalence→

Module 086 Topics

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Concurrency Control & Serializability

Precedence graph testing, view serializability, 2PL protocols, deadlock handling, and timestamps.

8.1Conflict Serializability & Precedence (Serialization) Graph Testing→8.2View Serializability & Blind Writes→8.3Recoverability: Recoverable, Cascadeless (ACA), and Strict Schedules→8.4Two-Phase Locking (2PL): Basic 2PL, Strict 2PL, and Rigorous 2PL→8.5Deadlock Handling: Wait-Die vs Wound-Wait Protocols→8.6Timestamp-Based Ordering Protocol & Thomas Write Rule→

Module 095 Topics

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Indexing & File Organization

Heap/hash files, primary vs secondary indices, B-Tree fanout, and B+ Tree range queries.

9.1File Organizations: Heap, Sorted, and Hash Files→9.2Indexing Concepts: Ordered Indices (Dense vs Sparse)→9.3Primary Index, Clustered Index, and Secondary Index→9.4B-Trees: Structure, Node Capacity, and Searching→9.5B+ Trees: Why Database Engines Use B+ Trees Over B-Trees→

Module 103 Topics

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Advanced Topics & Storage Internals

Extendible & linear dynamic hashing, relational calculus (TRC/DRC), and query execution plans.

10.1Static vs Dynamic Hashing (Extendible & Linear Hashing)→10.2Relational Calculus: Tuple Relational Calculus (TRC) & Domain Relational Calculus (DRC)→10.3Query Optimization & Query Execution Plans→

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Ready to master DBMS from the ground up? Start with the first topic:

👉 Proceed to Topic 1.1: What is Data & DBMS?

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