IB Computer Science Topic A.2.1 DBMS and RDBMS…

Definition

Database Management System (DBMS)

Software that creates, stores, retrieves, and manages data in one or more databases.

Definition

Relational Database Management System (RDBMS)

A type of DBMS that organises data into two-dimensional tables (relations) linked by keys.

Outline the Functions and Tools of a DBMS

Data dictionary: The DBMS maintains a dedicated “metadata repository” that lists every table, column, data‑type, length and relationship, so the engine always knows the exact structure it must enforce.
Data safety: Built‑in backup, recovery and integrity‑checking modules create consistent snapshots, ship logs and verify pages so that data can be restored accurately after hardware failures or user errors.
Query processor: An SQL interpreter parses each query, validates it against the schema and hands it to an optimiser that chooses the most efficient execution plan before returning the result set.
Storage engine: Low‑level routines handle all create, read, update and delete (CRUD) operations on disk, translating logical rows into physical pages and ensuring every change is recorded in the transaction log.
Concurrency control: A transaction manager applies locks, timestamps or multiversion snapshots so that many users can work simultaneously without overwriting one another, giving the illusion of a serial schedule.
Security services: The DBMS enforces role‑based access rights that specify who may read or write each object, records every change in an audit trail, and optionally encrypts data at rest and in transit to safeguard confidentiality.
Database‑administrator (DBA) tasks: The DBA designs and updates schemas, assigns user privileges and passwords, schedules backups, and drafts disaster‑recovery plans to keep the system resilient and compliant.

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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.

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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

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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

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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.

Definition

Database Management System (DBMS)

Software that creates, stores, retrieves, and manages data in one or more databases.

Definition

Relational Database Management System (RDBMS)

A type of DBMS that organises data into two-dimensional tables (relations) linked by keys.

Outline the Functions and Tools of a DBMS

Data dictionary: The DBMS maintains a dedicated “metadata repository” that lists every table, column, data‑type, length and relationship, so the engine always knows the exact structure it must enforce.
Data safety: Built‑in backup, recovery and integrity‑checking modules create consistent snapshots, ship logs and verify pages so that data can be restored accurately after hardware failures or user errors.
Query processor: An SQL interpreter parses each query, validates it against the schema and hands it to an optimiser that chooses the most efficient execution plan before returning the result set.
Storage engine: Low‑level routines handle all create, read, update and delete (CRUD) operations on disk, translating logical rows into physical pages and ensuring every change is recorded in the transaction log.
Concurrency control: A transaction manager applies locks, timestamps or multiversion snapshots so that many users can work simultaneously without overwriting one another, giving the illusion of a serial schedule.
Security services: The DBMS enforces role‑based access rights that specify who may read or write each object, records every change in an audit trail, and optionally encrypts data at rest and in transit to safeguard confidentiality.
Database‑administrator (DBA) tasks: The DBA designs and updates schemas, assigns user privileges and passwords, schedules backups, and drafts disaster‑recovery plans to keep the system resilient and compliant.

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.

IB Computer Science A.2.1 DBMS and RDBMS Notes

IB Computer Science A.2.1 DBMS and RDBMS Notes

Outline the Functions and Tools of a DBMS

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Outline the Functions and Tools of a DBMS

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IB Computer Science A.2.1 DBMS and RDBMS 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

IB Computer Science A.2.1 DBMS and RDBMS 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

Outline the Functions and Tools of a DBMS

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

Outline the Functions and Tools of a DBMS

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

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