6911. Operational Snapshots: aggregate-table refresh — Design the database contract and invariants. — School ERP — Node.js + Express + mysql2

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 1 Views Verified

Scenario: A School ERP system needs aggregate-table refresh. Design the database contract and invariants. 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 aggregate-table refresh faster.

Disable transaction/consistency controls to make aggregate-table refresh faster.

Additional Explanation

A production snapshot needs an explicit consistency boundary and verification.

Verified Correct Answer

Option 2: Create aggregate-table refresh with an explicit consistency boundary, parameteri

Create aggregate-table refresh 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 aggregate-table refresh with uncontrolled reads and assume the result is

Create aggregate-table refresh 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 aggregate-table refresh before validation and repair discrepancies later

Publish aggregate-table refresh before validation and repair discrepancies later.

Additional Explanation

A production snapshot needs an explicit consistency boundary and verification.