DBS-C01 Monitoring and Troubleshooting Practice Question
A company uses Amazon RDS for PostgreSQL with logical replication to a downstream system. The replication slot grows unbounded and causes storage full issues. Which action resolves this without data loss?
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
✓
Monitor the replication slot and advance it using pg_replication_slot_advance
Monitoring and advancing the replication slot prevents WAL accumulation. Option A is wrong because disabling replication causes data loss. Option B is wrong because increasing storage is a temporary fix, not a resolution. Option D is wrong because deleting old WAL logs may break replication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable logical replication and use DMS instead
Why it's wrong here
DMS is different; disabling replication stops data flow.
- ✗
Increase the allocated storage size of the RDS instance
Why it's wrong here
This only delays the problem.
- ✓
Monitor the replication slot and advance it using pg_replication_slot_advance
Why this is correct
Advancing the slot allows WAL cleanup.
- ✗
Delete the replication slot and recreate it
Why it's wrong here
Deleting the slot may cause data loss if downstream hasn't consumed.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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