CodeHelp - by Babbar Courses

Relational Model Explained - DBMS for Placements

Learn how relational databases represent tables and relationships through keys, schemas, and integrity constraints.

• YouTube
• 56 minutes
• Self-Paced
• Free Video

Designing the ER Model of Facebook Database - DBMS for Placements

Design a Facebook database ER model by identifying entity sets, attributes, relationships, and constraints.

• YouTube
• 20 minutes
• Self-Paced
• Free Video

How to Think and Formulate an ER Diagram - Banking System ER Model

Learn to formulate an entity-relationship diagram by identifying entities, attributes, relationships, and constraints for a banking system.

• YouTube
• 27 minutes
• Self-Paced
• Free Video

Extended ER Features - Abstraction in ER Model

Explore specialization, generalization, inheritance, and aggregation in the Extended Entity-Relationship model.

• YouTube
• 31 minutes
• Self-Paced
• Free Video

Solving LeetCode Problems on Concurrency - Operating Systems Placement Series

Work through three LeetCode concurrency problems—alternating output, zero-even-odd sequencing, and H2O formation—to practice synchronization concepts.

• YouTube
• 34 minutes
• Self-Paced
• Free Video

What Is Thrashing - Important Interview Question

Understand operating-system thrashing through its causes, CPU-utilization effects, and working-set and page-fault-frequency techniques.

• YouTube
• 35 minutes
• Self-Paced
• Free Video

Page Replacement Algorithms - How to Implement LRU Algorithm

Explore FIFO, optimal, LRU, LFU, and MFU page replacement algorithms, including Belady’s anomaly and practical ways to implement an LRU cache.

• YouTube
• 41 minutes
• Self-Paced
• Free Video

What Is Virtual Memory - Page Fault in OS

Understand how virtual memory uses demand paging, page faults, and locality of reference to manage memory in operating systems.

• YouTube
• 44 minutes
• Self-Paced
• Free Video

What Is Segmentation - Non-Contiguous Memory Allocation

Explains segmentation as a non-contiguous memory allocation technique, including address translation and its advantages and disadvantages in operating systems.

• YouTube
• 27 minutes
• Self-Paced
• Free Video

What Is Paging - Non-Contiguous Memory Allocation

Learn how operating systems use paging, page tables, address translation, context switching, and TLBs for non-contiguous memory allocation.

• YouTube
• 48 minutes
• Self-Paced
• Free Video

How OS Manages Free Space - Memory Management

Learn how operating systems manage free space, defragment memory, and compare first-fit, next-fit, best-fit, and worst-fit allocation methods.

• YouTube
• 31 minutes
• Self-Paced
• Free Video

Trie and Its Implementation - C++ Placement Series

Learn how tries work in C++, including insertion, searching, implementation, and removal operations.

• YouTube
• 48 minutes
• Self-Paced
• Free Video

Solving LeetCode Problems on Concurrency - OS Placement Series

Solve concurrency coding problems involving ordered execution, multithreaded Fizz Buzz, and the Dining Philosophers problem.

• YouTube
• 31 minutes
• Self-Paced
• Free Video

Hashmaps in C++ - C++ Placement Series

Learn how hash maps work in C++, including implementation, bucket arrays, hash functions, and collision handling.

• YouTube
• 1 hour 3 minutes
• Self-Paced
• Free Video

Deadlock Avoidance - Deadlock Detection and Recovery

Learn how operating systems avoid, detect, and recover from deadlocks using the Banker's algorithm and wait-for graphs.

• YouTube
• 24 minutes
• Self-Paced
• Free Video