IB Computer Science Topic A.2.8 Redundant Data Revision Notes (SL/HL)

IB Computer Science Topic A.2.8 Redundant Data Revision Notes (SL/HL) | RevisionDojo

Definition

Redundant Data

Occurs when the same piece of information is stored in multiple places within a database or a data storage system.

While redundant data might seem harmless at first, it can lead to a range of issues.
These issues can affect the integrity, reliability, and efficiency of the data.

Issues Caused by Redundant Data

Data Inconsistency/Integrity

One of the most significant issues caused by redundant data is data inconsistency and integrity
When the same data is stored in multiple locations, there is a risk that these copies may become out of sync and inaccurate.
This inconsistency can lead to errors in data retrieval and reporting, making it difficult to trust the accuracy of the data.

Example

Consider a customer database where the customer's address is stored in both the orders table and the customer table.
If the customer updates their address, but the change is only made in the customer table and not in the orders table, the database will have conflicting information about the customer's address.

Increased Storage Costs

Redundant data leads to unnecessary duplication, which increases the amount of storage required to maintain the database.
This not only raises costs but also reduces the efficiency of data storage.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Definition

Redundant Data

Occurs when the same piece of information is stored in multiple places within a database or a data storage system.

While redundant data might seem harmless at first, it can lead to a range of issues.
These issues can affect the integrity, reliability, and efficiency of the data.

Issues Caused by Redundant Data

Data Inconsistency/Integrity

One of the most significant issues caused by redundant data is data inconsistency and integrity
When the same data is stored in multiple locations, there is a risk that these copies may become out of sync and inaccurate.
This inconsistency can lead to errors in data retrieval and reporting, making it difficult to trust the accuracy of the data.

Example

Consider a customer database where the customer's address is stored in both the orders table and the customer table.
If the customer updates their address, but the change is only made in the customer table and not in the orders table, the database will have conflicting information about the customer's address.

Increased Storage Costs

Redundant data leads to unnecessary duplication, which increases the amount of storage required to maintain the database.
This not only raises costs but also reduces the efficiency of data storage.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

IB Computer Science A.2.8 Redundant Data Notes

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

Issues Caused by Redundant Data

Data Inconsistency/Integrity

Increased Storage Costs

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Issues Caused by Redundant Data

Data Inconsistency/Integrity

Increased Storage Costs

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account