Question 654 of 1,446
PCDE Migrate data solutions Practice Question
During a MySQL to Cloud SQL migration using Database Migration Service, the full dump phase is taking much longer than expected. The source MySQL database is 500 GB and the Cloud SQL instance is of sufficient size. What is the most likely cause of the slow dump?
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 source database has many MyISAM tables.
Without --single-transaction, mysqldump locks tables, causing contention and slow performance. DMS uses mysqldump internally and requires InnoDB tables with --single-transaction for consistent non-blocking dumps.
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 source database is using a public IP address.
Why it's wrong here
Public IP affects connectivity but not dump speed significantly.
- ✓
The source database has many MyISAM tables.
Why this is correct
MyISAM tables require table locks during dump, causing slower performance and potential contention. InnoDB tables with --single-transaction allow non-blocking dumps.
- ✗
Binary logging is not enabled on the source.
Why it's wrong here
Binary logging is needed for CDC, not for the initial dump phase.
- ✗
The Cloud SQL instance is using a shared-core machine type.
Why it's wrong here
While shared-core could be slow, DMS uses its own compute for dump; Cloud SQL only receives imported data.
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Last reviewed: Jul 4, 2026
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