DBS-C01 Management and Operations Practice Question
A company uses Amazon RDS for MySQL with read replicas. The application writes to the primary and reads from the replicas. Occasionally, the application reads stale data from the replicas. Which action would ensure read-after-write consistency without impacting write performance?
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
✓
Configure the application to read from the primary instance for critical queries.
Using the primary instance for reads that require consistency ensures the application reads the latest data. Session-level replication checks are not supported in standard MySQL.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set the replica_read_consistency parameter to 'session'.
Why it's wrong here
MySQL does not have a 'replica_read_consistency' parameter.
- ✗
Use the reader endpoint and increase the replica lag threshold.
Why it's wrong here
Increasing lag threshold does not guarantee consistency.
- ✓
Configure the application to read from the primary instance for critical queries.
Why this is correct
Reading from primary guarantees consistency.
- ✗
Enable the 'rds_set_replication_status' parameter on the read replicas.
Why it's wrong here
No such parameter exists.
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