Manage a solution that can span multiple database technologies →mediumMultiple ChoiceObjective-mapped
PCDE Practice Question: Manage a solution that can span multiple database technologies
A company wants to monitor Cloud SQL database latency for read replicas and set up an alert if the replica lag exceeds 30 seconds. Which metric 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
✓
cloudsql.googleapis.com/database/replication/replication_lag
The 'replication_lag' metric in Cloud SQL measures the lag between primary and read replica. It is the correct metric to set alerts for replica lag.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
cloudsql.googleapis.com/database/postgresql/num_backends
Why it's wrong here
Number of backends is about connections, not lag.
- ✓
cloudsql.googleapis.com/database/replication/replication_lag
Why this is correct
This metric directly reports the lag in seconds.
- ✗
cloudsql.googleapis.com/database/cpu/utilization
Why it's wrong here
CPU utilization does not indicate replication lag.
- ✗
cloudsql.googleapis.com/database/disk/bytes_used
Why it's wrong here
Disk usage is unrelated to lag.
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