Database Management Systems Quiz

Data independence = Ability to change the schema at one level without affecting the schema at the next higher level Entity = Represents a distinguishable object or concept in the real world Attribute = Describes the properties that define an entity Entity set = A collection of similar entities

File-processing system = Uses individual files to store data without any centralized control DBMS = Manages the storage and retrieval of data in a structured and efficient manner Database administrator = Responsible for database security, integrity, and performance E-R model = Represents the conceptual design of the database using entities and relationships

Requirements analysis = Gathering and analyzing the needs and objectives of the enterprise Conceptual design = Creating an initial high-level design based on the gathered requirements Physical design = Translating the high-level design into a specific database schema Implementation and testing = Installing the database system and verifying its functionality

<p>Single valued attribute = An attribute that holds a single value for each entity Multivalued attribute = An attribute that can hold multiple values for each entity Domain = Set of possible values for an attribute Derived attribute = An attribute whose value is derived from other attributes</p> Signup and view all the answers

<p>Banking environment E-R diagram = Customer table, Loan table Favorite sports team E-R diagram = Matches table, Players table, Statistics table Exploits tracking E-R diagram = Matches table, Scores table, Players table E-R schema reduction to tables = Entity sets mapped to relational tables</p> Signup and view all the answers

<p>i) Data redundancy: File-processing systems can have redundant data, while DBMS minimizes redundancy. ii) Data inconsistency: DBMS ensures data integrity, while file-processing systems can have inconsistent data. iii) Data sharing: DBMS allows for easier data sharing among multiple users, while file-processing systems may not support this. iv) Security and access control: DBMS provides better security and access control mechanisms compared to file-processing systems.</p> Signup and view all the answers

<p>Data independence refers to the ability to modify the schema definition in one level without affecting the schema definition in the next higher level. Physical data independence allows changes in the physical storage structure without affecting the conceptual or external levels. Logical data independence enables the modification of the conceptual schema without affecting the external schema or application programs.</p> Signup and view all the answers

<p>A database system architecture typically consists of three levels: i) External level: User views and applications. ii) Conceptual level: Community view of the database. iii) Internal level: Physical storage structures and access paths.</p> Signup and view all the answers

<p>The main functions of a database administrator include: i) Database design and implementation. ii) Security and user management. iii) Backup and recovery. iv) Performance monitoring and tuning.</p> Signup and view all the answers

<p>i) Requirement analysis. ii) Conceptual database design. iii) Logical database design. iv) Physical database design. v) Implementation. vi) Testing and maintenance.</p> Signup and view all the answers

<p>Data independence refers to the ability to change the schema at one level of a database system without having to change the schema at the next higher level. Physical data independence allows changes in the physical storage devices or indexing techniques without affecting the application programs. Logical data independence allows changes in the conceptual schema without affecting the existing external schemas or application programs.</p> Signup and view all the answers

<p>i) Entity: An object or concept about which data is stored in a database. ii) Attribute: A property or characteristic of an entity. Single valued attributes have a single value for a particular entity, while multivalued attributes can have multiple values for a particular entity. iii) Entity set: A collection of similar entities. iv) Domain: Set of permitted values for an attribute.</p> Signup and view all the answers

<p>The E-R diagram would include entities like 'Customer' and 'Loan', with a relationship 'Borrows' between them. The reduced E-R schema to a table would have attributes like CustomerID, CustomerName, LoanID, LoanAmount, etc., in the 'Customer' and 'Loan' tables.</p> Signup and view all the answers

<p>The E-R diagram would include entities like 'Match', 'Player', and 'Team', with relationships between them. The 'Summary' would be modeled as derived attributes based on player statistics and match scores.</p> Signup and view all the answers

<ol> <li>Data redundancy: File-processing systems have redundant data, while DBMS minimizes redundancy. 2) Data inconsistency: File-processing systems may have inconsistent data, while DBMS ensures data consistency. 3) Data isolation: In file-processing systems, data is isolated and fragmented, while DBMS provides centralized data storage. 4) Data dependence: File-processing systems are highly data-dependent, while DBMS promotes data independence.</li> </ol> Signup and view all the answers