DBS-C01 Management and Operations Practice Question
A company is running an Amazon RDS for MySQL DB instance with Multi-AZ deployment. The database experiences a failover due to a hardware failure. After the failover, the application team reports that a critical stored procedure is missing. What should the database administrator do to prevent this issue in the future?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the DB parameter group to enable binary logging.
In Amazon RDS MySQL Multi-AZ deployments, all database objects including stored procedures are replicated via synchronous storage-level replication. Therefore, a missing stored procedure after a failover is unlikely and indicates a potential replication issue. To prevent this, enabling binary logging ensures that DDL statements (such as CREATE PROCEDURE) are captured in binary logs. This allows binary log replication to maintain consistency, reduces the risk of orphaned objects, and provides the ability to recover using point-in-time restore if needed. Thus, modifying the DB parameter group to enable binary logging is the best preventive measure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create the stored procedure as a function instead.
Why it's wrong here
Converting a stored procedure to a function does not change its replication behavior; both are replicated identically.
- ✓
Modify the DB parameter group to enable binary logging.
Why this is correct
Correct. Enabling binary logging ensures all DDL changes are logged, which helps in replication consistency and provides the ability to recover from replication issues that might cause a stored procedure to be missing after failover.
- ✗
Ensure that the stored procedure is created on both the primary and standby instances by using a script or manually recreating it after failover.
Why it's wrong here
Incorrect. Stored procedures are automatically replicated in Multi-AZ deployments via storage-level replication, so manually creating them again is unnecessary and not a proper preventive action.
- ✗
Increase the binlog retention period to ensure the stored procedure is captured.
Why it's wrong here
Increasing the binlog retention period affects how long binary log files are kept, but does not directly prevent missing stored procedures after failover. It might help with recovery, but enabling binary logging is the more fundamental preventive step.
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