DBS-C01 Management and Operations Practice Question
Network Topology
Refer to the exhibit. A database engineer runs the command and receives the above output. The engineer wants to convert the database to Multi-AZ. Which command should be used?
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
✓
aws rds modify-db-instance --db-instance-identifier mydb --multi-az
'aws rds modify-db-instance' with the '--multi-az' flag modifies an existing DB instance to use Multi-AZ deployment. Option A is incorrect because 'reboot-db-instance' with '--force-failover' triggers a reboot and failover but does not change the Multi-AZ setting itself. Option B is incorrect because 'create-db-instance' is used to create a new instance, not modify an existing one. Option D is incorrect because 'create-db-cluster' is for creating an Aurora DB cluster, not for converting a single DB instance to Multi-AZ.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
aws rds reboot-db-instance --db-instance-identifier mydb --force-failover
Why it's wrong here
'reboot-db-instance' with '--force-failover' triggers a reboot and failover but does not change the Multi-AZ setting itself.
- ✗
aws rds create-db-instance --db-instance-identifier mydb --multi-az
Why it's wrong here
'create-db-instance' is used to create a new instance, not modify an existing one.
- ✓
aws rds modify-db-instance --db-instance-identifier mydb --multi-az
Why this is correct
'aws rds modify-db-instance' with the '--multi-az' flag modifies an existing DB instance to use Multi-AZ deployment.
- ✗
aws rds create-db-cluster --db-instance-identifier mydb --multi-az
Why it's wrong here
'create-db-cluster' is for creating an Aurora DB cluster, not for converting a single DB instance to Multi-AZ.
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