hardMultiple ChoiceObjective-mapped
CV0-004 Read Replica Practice Question
A company recently migrated its database to a cloud-managed database service. After the migration, the application team reports that some queries are returning stale data. The database is configured with read replicas. What is the most likely reason for the stale data?
⚠ Common exam trap
CompTIA Cloud+ often tests the concept of asynchronous replication lag in read replicas, and the trap here is that candidates may confuse stale data with network latency or misconfiguration, overlooking the fundamental behavior of read replicas returning data that is not yet fully synchronized.
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
✓
The application is reading from a read replica that has replication lag.
The most likely reason for stale data is that the application is reading from a read replica that has not yet applied all changes from the primary database. In cloud-managed database services like Amazon RDS or Azure SQL, read replicas use asynchronous replication, which introduces replication lag. If the application directs read queries to a replica that is behind, it will return data that is not current.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The database parameter group is misconfigured.
Why it's wrong here
Parameter group misconfiguration would cause different issues, not stale data.
- ✓
The application is reading from a read replica that has replication lag.
Why this is correct
Correct. Replication lag causes replicas to return older data; application should direct write-after-read to primary.
- ✗
The network latency between the application and database is high.
Why it's wrong here
Network latency causes slow queries, not stale data.
- ✗
The database’s backup and restore process has corrupted the data.
Why it's wrong here
Corruption would cause errors or inconsistent data, not just stale data.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CV0-004 exam.