Scenario: A subscription billing application must handle replica promotion rehearsal. 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 replica promotion rehearsal without defining transaction boundaries, retry b
Run replica promotion rehearsal 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 replica promot
Use a parameterized, transaction-aware MySQL 8 implementation for replica promotion rehearsal, 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 replica promotion rehearsal.
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 replica
Disable database protections and repair inconsistent rows manually after replica promotion rehearsal runs.
Additional Explanation
Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.