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A3.3 Database programmingA3.3.6

How transactions maintain data integrity in a database

Describe how transactions maintain data integrity in a database

AHL≈ 55 minCommand term: DescribePremium

In this lesson

  • Describing what a transaction is and why databases need them
  • Describing the roles of atomicity, consistency, isolation and durability (ACID)
  • Using BEGIN TRANSACTION, COMMIT and ROLLBACK

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What's inside

  1. LearnWhat a transaction is
  2. LabSee each ACID property at work
  3. LearnThe four properties
  4. CheckQuick check
  5. LearnTransaction control language (TCL)
  6. LabTransactions at the bank
  7. Try itExperiments in the lab
  8. ExamWorked exam answer
  9. ReviewMistakes examiners see
  10. Exam practiceExam-style questions

Ends with 5 exam-style questions worth 12 marks, with a self-marking markscheme.