6975. Operational Snapshots: attendance snapshot — Recover from failure without violating consistency. — School ERP — Node.js + Express + mysql2

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

Scenario: A School ERP system needs attendance snapshot. Recover from failure without violating consistency. Define the snapshot boundary, consistency rules, failure handling, validation and recovery strategy.

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Answer & Explanation

4 Answers

Verified

Option 1: Disable transaction/consistency controls to make attendance snapshot faster.

Disable transaction/consistency controls to make attendance snapshot faster.

Additional Explanation

A production snapshot needs an explicit consistency boundary and verification.

Verified Correct Answer

Option 2: Create attendance snapshot with an explicit consistency boundary, parameterized

Create attendance snapshot with an explicit consistency boundary, parameterized SQL, deterministic validation and safe retry/recovery handling.

Additional Explanation

A production snapshot needs an explicit consistency boundary and verification.

Verified

Option 3: Create attendance snapshot with uncontrolled reads and assume the result is alwa

Create attendance snapshot with uncontrolled reads and assume the result is always consistent.

Additional Explanation

A production snapshot needs an explicit consistency boundary and verification.

Verified

Option 4: Publish attendance snapshot before validation and repair discrepancies later.

Publish attendance snapshot before validation and repair discrepancies later.

Additional Explanation

A production snapshot needs an explicit consistency boundary and verification.