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PCDE Practice Question: Design innovative, scalable, and highly available cloud database solutions
A company runs a MySQL database on-premises and wants to migrate to Cloud SQL with minimal downtime. They have a multi-terabyte database. Which migration method is most appropriate?
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
✓
Use Database Migration Service with continuous replication.
Database Migration Service (DMS) supports continuous replication and minimal downtime for large databases. It handles initial snapshot and ongoing CDC.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Cloud SQL's import feature from a CSV file.
Why it's wrong here
Not practical for multi-TB and requires downtime.
- ✗
Take a physical backup and restore to Cloud SQL.
Why it's wrong here
Restore requires downtime and may not be supported across versions.
- ✓
Use Database Migration Service with continuous replication.
Why this is correct
DMS provides minimal downtime via CDC.
- ✗
Use mysqldump to export and then import into Cloud SQL.
Why it's wrong here
Causes significant downtime for large databases.
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