IB Computer Science Topic A.3.3 Methods of Data Recovery Revision Notes (SL/HL)

IB Computer Science Topic A.3.3 Methods of Data Recovery Revision Notes (SL/HL) | RevisionDojo

Definition

Data Recovery

The process of restoring lost, corrupted, or inaccessible data from backups or other sources.

Full baseline backup: A complete copy of every data file, kept off‑site so the entire database can be rebuilt after a catastrophic loss.
Incremental / differential backup: Smaller jobs that capture only data blocks changed since the previous backup, reducing storage and network load while still allowing a full restore.
Transaction log + point-in-time recovery: The DBMS replays the write-ahead log up to a chosen second, reversing accidental deletes or corruption without losing the day’s valid work.
Real-time replication with automatic fail-over: Every committed change is streamed to a standby server that can take over instantly, keeping services online even if the primary site fails.
RAID or similar hardware redundancy: Disks are mirrored or striped with parity so the system survives one (or more) drive failures without data loss or downtime.
Documented disaster-recovery / business-continuity plan: Step-by-step procedures, roles, and time-targets that guide staff in restoring data and critical services after fire, flood, or cyber-attack.

Example

Transaction log + point-in-time recovery
- A banking system processes thousands of transactions per second.
- If a software bug accidentally deletes today’s wire transfers, the DBMS can use its transaction log to roll forward all valid changes up to one second before the bug occurred.
- This allows the bank to recover without losing legitimate transactions that happened earlier in the day.
Real-time replication with automatic fail-over
- E-commerce giants like Amazon use real-time replication to keep a standby database server synchronized with the primary.
- If the primary server in one region fails due to a power outage, the standby server in another region takes over immediately.
- Customers can continue browsing and checking out products with no visible interruption.

Social & ethical considerations 

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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

Data Recovery

The process of restoring lost, corrupted, or inaccessible data from backups or other sources.

Full baseline backup: A complete copy of every data file, kept off‑site so the entire database can be rebuilt after a catastrophic loss.
Incremental / differential backup: Smaller jobs that capture only data blocks changed since the previous backup, reducing storage and network load while still allowing a full restore.
Transaction log + point-in-time recovery: The DBMS replays the write-ahead log up to a chosen second, reversing accidental deletes or corruption without losing the day’s valid work.
Real-time replication with automatic fail-over: Every committed change is streamed to a standby server that can take over instantly, keeping services online even if the primary site fails.
RAID or similar hardware redundancy: Disks are mirrored or striped with parity so the system survives one (or more) drive failures without data loss or downtime.
Documented disaster-recovery / business-continuity plan: Step-by-step procedures, roles, and time-targets that guide staff in restoring data and critical services after fire, flood, or cyber-attack.

Example

Transaction log + point-in-time recovery
- A banking system processes thousands of transactions per second.
- If a software bug accidentally deletes today’s wire transfers, the DBMS can use its transaction log to roll forward all valid changes up to one second before the bug occurred.
- This allows the bank to recover without losing legitimate transactions that happened earlier in the day.
Real-time replication with automatic fail-over
- E-commerce giants like Amazon use real-time replication to keep a standby database server synchronized with the primary.
- If the primary server in one region fails due to a power outage, the standby server in another region takes over immediately.
- Customers can continue browsing and checking out products with no visible interruption.

Social & ethical considerations 

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.3.3 Methods of Data Recovery 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

Social & ethical considerations

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

Social & ethical considerations

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

Social & ethical considerations 

Social & ethical considerations 