Scenario: A e-commerce application must handle DDL blocking diagnosis. Build success, failure, concurrency and scale tests. 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 DDL blocking diagnosis without defining transaction boundaries, retry behavi
Run DDL blocking diagnosis 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 DDL blocking d
Use a parameterized, transaction-aware MySQL 8 implementation for DDL blocking diagnosis, 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 DDL blocking diagnosis.
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 DDL blo
Disable database protections and repair inconsistent rows manually after DDL blocking diagnosis runs.
Additional Explanation
Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.