4221. Binlog & CDC: binlog retention pressure — Design the database contract and invariants. — SaaS — PHP PDO

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

Scenario: A SaaS application must handle binlog retention pressure. Design the database contract and invariants. 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: Use unparameterized dynamic SQL and rely only on application-side validation for

Use unparameterized dynamic SQL and rely only on application-side validation for binlog retention pressure.

Additional Explanation

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

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Option 2: Disable database protections and repair inconsistent rows manually after binlog

Disable database protections and repair inconsistent rows manually after binlog retention pressure runs.

Additional Explanation

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

Verified

Option 3: Run binlog retention pressure without defining transaction boundaries, retry beh

Run binlog retention pressure 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 4: Use a parameterized, transaction-aware MySQL 8 implementation for binlog retenti

Use a parameterized, transaction-aware MySQL 8 implementation for binlog retention pressure, validate the invariant, and explicitly test concurrency, retries and recovery.

Additional Explanation

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