Podcast
Questions and Answers
What is one of the main benefits of reducing redundancy in a database?
What is one of the main benefits of reducing redundancy in a database?
- Increasing data processing speed
- Reducing data storage space
- Enhancing data security
- Improving data consistency (correct)
What is an integrity constraint in a database?
What is an integrity constraint in a database?
- A rule to ensure data consistency
- A technique to improve data processing speed
- A rule to validate data inputs (correct)
- A method to reduce data redundancy
What is a potential problem that can occur when redundant data is not updated correctly?
What is a potential problem that can occur when redundant data is not updated correctly?
- Data security breach
- Data redundancy
- Data inconsistency
- Data processing failure (correct)
What is the primary goal of a Database Administrator (DBA) in a company?
What is the primary goal of a Database Administrator (DBA) in a company?
What is one advantage of using a Database Management System (DBMS) over a spreadsheet system?
What is one advantage of using a Database Management System (DBMS) over a spreadsheet system?
What is one way a DBMS can improve productivity?
What is one way a DBMS can improve productivity?
What does data independence in a DBMS allow for?
What does data independence in a DBMS allow for?
What is the primary function of a DBMS?
What is the primary function of a DBMS?
What is an entity in a database?
What is an entity in a database?
What is a record in a database?
What is a record in a database?
What type of relationship exists between customers and their sales reps?
What type of relationship exists between customers and their sales reps?
What is an attribute in a database?
What is an attribute in a database?
What was a major limitation of old file systems?
What was a major limitation of old file systems?
What is a key advantage of DBMS systems over file systems?
What is a key advantage of DBMS systems over file systems?
What was a major issue with using file systems on computers?
What was a major issue with using file systems on computers?
What is an advantage of DBMS systems in terms of data consistency?
What is an advantage of DBMS systems in terms of data consistency?
What is a limitation of file systems that affects productivity?
What is a limitation of file systems that affects productivity?
What is a benefit of DBMS systems in terms of database security?
What is a benefit of DBMS systems in terms of database security?
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Study Notes
Data File and Database System
- A database system stores all data in files, including lists of entities, their attributes, and relationships between entities.
Advantages of Database System
- Database systems allow for getting more information from the same amount of data.
- They enable sharing data among multiple users.
- They balance conflicting requirements by imposing structure on the database.
- They reduce redundancy by saving data elements in only one place, conserving storage space and simplifying updates.
- They facilitate consistency by reducing redundancy.
- They improve integrity by enforcing rules and constraints on data.
- They provide data independence, allowing for changes to the database structure without reentering data.
Database Management System (DBMS)
- A DBMS is a software solution that allows users to store, retrieve, and produce reports from data.
- A DBMS can perform functions such as update, insertion, and deletion.
Basic Database Terms
- An entity is something that you want to store data about, often referred to by a plural noun (e.g., customers, accounts, employees).
- An attribute is a characteristic of an entity, also known as a field, column, or property.
- A record is all the data about one instance of an entity.
- A relationship is an association between entities in a database (e.g., customers and sales reps).
Limitations of File Systems
- File systems take a long time to create, learn, and use.
- They take a long time to harvest information from.
- Maintenance is difficult.
- They have minimal security, requiring physical presence.
- They do not support features commonly found in DBMS systems.
File System vs. DBMS
- File systems do not support structural independence, requiring changes to programs when file structure changes.
- DBMS systems support structural independence, allowing for changes to file structure without changing programs.
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