Database Systems IS301 Lecture 2

True (A)

To simplify database interactions for users.

<p>client-server</p> Signup and view all the answers

<p>DBMS Languages = Languages used for database manipulation Database Utilities = Tools for maintaining the database Data Manipulation Language (DML) = Used for querying and updating data Client-Server Architecture = Architecture where clients request services from a server</p> Signup and view all the answers

<p>RETRIEVE (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Performance monitoring tool</p> Signup and view all the answers

<p>Clients and DBMS server (C)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Simplified design.</p> Signup and view all the answers

<p>business logic</p> Signup and view all the answers

<p>Network Model = Supports many-to-many relationships Hierarchical Model = Organizes data in a tree-like structure Relational Model = Uses tables to represent data Object-Oriented Model = Incorporates objects and classes</p> Signup and view all the answers

<p>Relational algebra (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Hierarchical Model</p> Signup and view all the answers

<p>The structural design of the database including tables and relationships (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Conceptual data models and physical data models.</p> Signup and view all the answers

<p>database state</p> Signup and view all the answers

<p>Schema = Structure that defines the organization of data Instance = Snapshot of data at any given time Data Model = Theory and methodology for organizing data Database State = Current data residing in the database</p> Signup and view all the answers

<p>Specifying programming languages (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>To provide a framework for organizing and managing data.</p> Signup and view all the answers

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A data model describes the structure of a database, defining entities, attributes, and relationships between them.

A conceptual data model focuses on representing a real-world scenario and its entities and relationships.

A logical data model defines the structure of the database using data structures such as tables and columns, but doesn't specify implementation details.

A physical data model specifies how the database is implemented on specific hardware and software, including storage structures and access methods.

A schema defines the overall structure of the database, including data types, constraints, and relationships.

A snapshot of the database at a particular time, including the actual data values.

The collection of all schemas for all databases in a system.

A set of rules that ensure data integrity and consistency within the database, such as primary keys, foreign keys, and data type restrictions.

A three-level architecture that separates the user's view of the data from the physical storage of the data, providing flexibility and data independence.

The ability to modify the schema at one level without affecting other levels, enhancing flexibility and reducing impact on applications.

A language used to interact with a database management system (DBMS), providing a means to access and manipulate data.

A type of DBMS language used for retrieving data from a database (e.g., SQL SELECT statement).

Provides a user-friendly interface to interact with a database management system (DBMS), making it easier for users to access and manipulate data.

Tools designed to manage and maintain a database, including tasks like backup and recovery, security management, and performance optimization.

A database system architecture where all data is stored and managed on a single server, providing centralized control and easy management.

A database system architecture where data is distributed across multiple servers, allowing for scalability and improved performance.

A client-server architecture where clients directly interact with the database server. This simplifies the system, but can be less efficient for complex applications.

A client-server architecture with an additional middleware layer between clients and the database server. This improves performance, security, and scalability.

Systems like Oracle and MySQL, managing large amounts of data across various applications. They provide features like data integrity, concurrency control, and security.

DBMSs are categorized based on their features, scalability, cost, and performance.

Factors like the size of data, user needs, security requirements, and available resources influence the choice of DBMS and the cost associated with it.

DBMSs offer a variety of features, some essential while others optional. These can impact the cost, complexity and overall choice.

The Network Model, a hierarchical structure for organizing data, with records linked through relationships.

The Hierarchical Model, a tree-like structure, where data is organized in a parent-child arrangement. Information flows in one direction, similar to a family tree.