30 Questions
Who is responsible for deciding what data should be stored in the database?
Data administrator (DA)
What is the main advantage of a database system in terms of data protection?
Better protection against unintentional loss and unlawful access
What is the role of a Database Administrator (DBA) in an organization?
Implementing the data administrator's decisions and ensuring system performance
Why is data considered one of the enterprise's most valuable assets?
Data is what's stored in a database system and is crucial for decision-making.
What challenge do enterprises face when maintaining private files for individual applications?
Decentralized control of data
What knowledge does a Data Administrator (DA) need to have?
Basic understanding of database system capabilities at a technical level
What is a single-user system in the context of a database system?
A system in which one user can access the database at any given time.
Define a multi-user system in the context of a database system.
A system in which many users can access the database at any given time.
How is data described in a database system?
Data can be both integrated and shared.
Explain what is meant by the term 'integrated data' in a database system.
The database can be thought of as a unification of several distinct files, with any redundancy among those files eliminated.
In the context of a database system, what does 'shared data' refer to?
The database can be shared among different users, allowing access to the same data, possibly even concurrently.
What is Structured Query Language (SQL) used for in database management?
SQL is a programming language for storing and processing information in a relational database.
What is the role of a database administrator in terms of design and operational use of a database?
To make decisions that provide the best use of resources for the organization as a whole.
How can a database administrator enforce standards in the representation of data?
By ensuring all applicable standards are followed.
What is Data Independence in the context of a DBMS?
A property that allows changing the database schema at one level without affecting the schema at the next higher level.
What is Physical Data Independence?
Deals with changes in the physical storage of data without affecting the logical structure or data presentation to users.
What is Logical Data Independence focused on?
Changes to the logical structure of the data without impacting the applications using the data.
Why is Data Independence considered an objective for database systems?
To facilitate changes in the database schema without disrupting the applications built on top of it.
What are the two main cons of using data dependent systems?
Different applications need different views of the same data and changes to the database can require major modifications to applications.
Define 'Stored Field' in the context of database systems.
A stored field is the smallest unit of stored data, identified by a field name, such as age or car registration number.
What is a 'Stored Record' in a database system?
A collection of related stored fields that contain all the information stored about a person or thing.
Explain the concept of a 'Stored File' in a database system.
A stored file is a collection of all currently existing occurrences of one type of stored record, forming a table with records of the same structure.
What is meant by a 'Non-Database System'?
A system where any given logical record seen by an application is identical to some corresponding stored record.
Why do different applications need different views of the same data?
To cater to the specific requirements and interface design of each application.
What are the fundamental needs to understand how data is stored?
Representation of Numeric Data, Representation of Character Data, Units of Numeric Data, Data Materialization
How is a numeric field typically stored?
In internet arithmetic form or as a character string
What is the difference between a relational system and a nonrelational system?
Relational systems perceive data as tables and derive new tables from old ones, while nonrelational systems may use other data structures in addition to tables.
Why are relational systems called 'relational'?
Because 'relation' is a mathematical term for a table
What is the process of materialization in data storage?
Constructing an occurrence of the logical field from the corresponding stored field occurrence and presenting it to the application
What do the operators in a relational system do?
Derive 'new' tables from 'old' ones
Test your knowledge on database management in the context of construction. Topics include introduction to database systems, Structured Query Language (SQL), and relational databases.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
