Understanding Data in Digital Services

Kiara is working on a project that requires storing a large amount of data for her company. Which of the following is a common data storage solution she might use?

• Floppy Disks

• Solid State Drives (SSD)

• Punch Cards

• Compact Discs (CD)

Answer explanation

Solid State Drives (SSD) are a modern and efficient data storage solution, ideal for large amounts of data due to their speed and reliability. Floppy disks, punch cards, and CDs are outdated and not suitable for current data storage needs.

Arthur is working on a project to improve the efficiency of his company's data management. What is the primary purpose of data modelling in this context?

• To create physical copies of data

• To visualise data trends

• To organise and structure data for efficient use

• To delete unnecessary data

Answer explanation

The primary purpose of data modelling is to organise and structure data for efficient use. This helps improve data management by ensuring that data is easily accessible and usable, which is crucial for Arthur's project.

Emily is responsible for managing sensitive customer data at her company. Which of the following is a key practice she should follow to ensure data security?

• Sharing passwords with colleagues

• Using encryption to protect data

• Storing all data on a single device

• Disabling firewalls

Answer explanation

Using encryption to protect data is crucial for safeguarding sensitive customer information. It ensures that even if data is intercepted, it remains unreadable without the proper decryption key, thus enhancing data security.

In a relational database, what is a 'primary key' used for?

• To encrypt data

• To uniquely identify each record in a table

• To store large files

• To create visual reports

Which of the following is a characteristic of big data?

• Small data sets

• Low velocity

• High volume and variety

• Limited data sources

Which data modelling technique uses entities and relationships to represent data?

• Hierarchical Model

• Network Model

• Entity-Relationship Model

• Object-Oriented Model

What is a common advantage of using cloud storage for businesses?

• Limited access to data

• High maintenance costs

• Accessibility from anywhere with internet

• Data loss during power outages

What is the role of a 'foreign key' in a relational database?

• To encrypt data

• To link tables together

• To store images

• To create user accounts

Isabella is a manager at a retail company and is considering implementing big data analytics. Which of the following is a benefit she can expect from using big data analytics in her business?

• Decreased data redundancy

• Improved decision-making

• Faster data processing

• Lower storage costs

Answer explanation

Implementing big data analytics enables Isabella to analyze vast amounts of data, leading to improved decision-making by providing insights that can guide strategies and operations effectively.

What is a common method for ensuring data integrity in databases?

• Using data validation rules

• Allowing unrestricted data entry

• Storing data in multiple formats

• Disabling data backups