Key term
WJEC A-Level Computer Science 601-5345-3
Hardware: Architecture, Memory and Storage
Networks and Data Transmission
Logic Gates and Boolean Algebra
Data Representation and Data Types
Data Structures
Organisation of Data: Files and Records
Database Systems
The Operating System
Algorithms and Programs
Principles of Programming
Systems Analysis
Software Engineering and Program Construction
Topic overviewIntegrated development environments and their purposeEditors, syntax highlighting and code entry toolsDebugging tools: breakpoints, stepping and watchesTranslation, source code and object codeLexical analysis and the symbol tableSyntax and semantic analysisCode generation and optimisation
Types of Software System
Practical Programming
Data Security and Integrity
Computing, Society and the Law
Topic overviewSocial and economic change from computingComputers and the nature of employmentThe digital divide and cultural changeEnvironmental cost of computingData protection and freedom of information lawThe Computer Misuse Act 1990 and computer crimeCopyright, surveillance and professional codes
Advanced Data Structures and Logic
Recursion, Sorting and Searching
Programming Paradigms and Translators
Topic overviewFunctional, declarative and imperative paradigmsClasses, methods and object-oriented designStandardisation of computer languagesAmbiguity in natural language and unambiguous notationBackus-Naur form and syntax diagramsCompilers, interpreters and assemblersTranslation and execution errors
System Design and Human-Computer Interaction
Software Engineering Tools and Professional Practice
Topic overviewSoftware tools for the software engineering processSoftware packages in systems analysis and specificationSoftware packages in systems designTesting tools and testing strategiesProgram version managementProgram libraries and project management toolsCodes of conduct and professional behaviour
Advanced Architecture and Assembly Language
Communication Networks and File Organisation
Number Representation and Floating Point
Databases and Distributed Systems
Topic overviewConsistency, redundancy and data independenceRelational organisation and normalisationRestructuring data into third normal formEntity relationship modellingQuery languages and SQLValidation, verification and the DBMSBig Data, data warehousing and miningDistributed systems and distributed databases
Operating System Management
Software Systems and Applications
Data Security, Cryptography and Attack
Systems Analysis
Backup, recovery and documentation
- 3 things to know
- AS Unit 1
Overview
Grandfather-father-son method of keeping backups, recovery procedure and transaction log.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
What must be restored, and in what order, under an incremental regime?
Evaluation
Give one advantage and one drawback of incremental backups compared with full ones.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a backup?
Model answer
A backup is a copy of data kept separately so that the data can be restored if the original is lost, damaged or wrongly altered.
- 2
When is a full backup taken in a typical backup schedule?
Model answer
At a regular interval such as weekly, with faster partial backups taken between one full copy and the next.
- 3
What must be restored, and in what order, under an incremental regime?
Model answer
The last full backup first, then every incremental backup taken since it, applied in the order they were made.
- 4
Give one advantage and one drawback of incremental backups compared with full ones.
Model answer
Each incremental backup is far quicker to take and needs much less storage, but restoring means applying the last full backup and then every incremental one taken since, which takes longer.
- 5
Describe the grandfather-father-son method of keeping backups.
Model answer
Three generations of backup are kept in rotation, with the newest as the son, the previous one as the father and the one before that as the grandfather, so an older copy is still available if the most recent turns out to be faulty.
- 6
Why should a backup copy be stored away from the computer it came from?
Model answer
A fire, flood or theft at the site would otherwise destroy the backup along with the original, leaving nothing to restore from.
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