4255. Binlog & CDC: CDC ordering validation — Recover from failure without violating consistency. — School ERP — Python + FastAPI + SQLAlchemy

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

Scenario: A School ERP application must handle CDC ordering validation. Recover from failure without violating consistency. Explain the invariant, SQL strategy, transaction/locking behavior, failure handling, observability and test plan. Use MySQL 8-oriented syntax where applicable.

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Answer & Explanation

4 Answers

Verified

Option 1: Run CDC ordering validation without defining transaction boundaries, retry behav

Run CDC ordering validation without defining transaction boundaries, retry behavior, or production validation.

Additional Explanation

Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.

Verified Correct Answer

Option 2: Use a parameterized, transaction-aware MySQL 8 implementation for CDC ordering v

Use a parameterized, transaction-aware MySQL 8 implementation for CDC ordering validation, validate the invariant, and explicitly test concurrency, retries and recovery.

Additional Explanation

Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.

Verified

Option 3: Use unparameterized dynamic SQL and rely only on application-side validation for

Use unparameterized dynamic SQL and rely only on application-side validation for CDC ordering validation.

Additional Explanation

Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.

Verified

Option 4: Disable database protections and repair inconsistent rows manually after CDC ord

Disable database protections and repair inconsistent rows manually after CDC ordering validation runs.

Additional Explanation

Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.