Assignment Set – 1

Q1. List and explain the Network Model advantages and disadvantages? 10    

Ans 1.

Network Model: Advantages and Disadvantages

The Network Data Model, introduced by the CODASYL DBTG in the late 1960s, is one of the earliest database models designed to handle complex data relationships. It organizes data using a flexible structure of records and sets, where each record can have multiple parent and child records. This model is particularly effective for representing many-to-many relationships and hierarchical associations where relationships extend beyond simple tree structures. Understanding its advantages and disadvantages helps evaluate its relevance in

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Q2. Explain various storage devices and their characteristics. 10           

Ans 2.

Storage Devices and Their Characteristics

Storage devices form the foundation of modern computing by enabling the recording, retrieval and preservation of digital information. They vary based on technology, capacity, speed, durability and cost. Understanding different storage devices and their characteristics is essential for selecting the right medium for personal, business or industrial applications.

Q3. Explain Filtered, Hash and Unique indexing  10       

Ans 3.

Filtered, Hash and Unique Indexing

Indexing is a crucial database optimization technique that improves query performance by creating fast access paths to data. Different indexing strategies serve different purposes depending on the type of data and query requirements. Among these, filtered indexing, hash indexing and unique indexing are widely used in modern database systems to enhance efficiency, enforce constraints and improve search performance. Each indexing type operates

Assignment Set – 2

Q4. What is an Embedded SQL statement? Describe briefly 10 

Ans 4.

Embedded SQL refers to the technique of integrating SQL queries directly within a host programming language such as C, Java, COBOL or Python. Instead of executing SQL commands separately through external interfaces, embedded SQL allows programmers to incorporate database queries seamlessly inside application code. This tight integration enables efficient communication between the application logic and the database management

Q5. List and explain Database Recovery Models   10       

Ans 5.

List and Explain Database Recovery Models

Database recovery models define how transactions are logged, how data can be restored and what recovery options are available during system failure. These models play a crucial role in protecting data integrity and maintaining business continuity. By selecting an appropriate recovery model, organizations balance performance, storage needs and disaster recovery requirements. Recovery models mainly govern logging behavior, backup strategies and the

Q6. Explain What is concurrency and its Importance? 10           

Ans 6.

Concurrency and Its Importance

Concurrency in database systems refers to the ability of multiple users or transactions to access and manipulate data simultaneously without interfering with one another. As modern applications serve numerous clients at the same time, concurrency control becomes essential for maintaining consistency, integrity and performance. Effective concurrency ensures that transactions behave correctly even in high-volume environments, supporting smooth and