PCDE Migrate data solutions Practice Question
An engineer is migrating a MySQL database to Cloud SQL using DMS. The source database uses MyISAM tables. During the migration, the full dump phase fails with a timeout. What should the engineer do to increase the likelihood of success?
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
✓
Convert the MyISAM tables to InnoDB before migration.
MyISAM tables require table-level locking during dump. Using --single-transaction is only for InnoDB. To reduce lock contention, the engineer should schedule the migration during low-traffic periods or convert MyISAM to InnoDB before migration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add the --single-transaction flag to the mysqldump command.
Why it's wrong here
--single-transaction is for InnoDB; it has no effect on MyISAM.
- ✗
Increase the DMS migration job timeout.
Why it's wrong here
Timeout is not configurable; the issue is lock contention.
- ✗
Use --skip-lock-tables to avoid locking.
Why it's wrong here
This may lead to inconsistent dumps for MyISAM.
- ✓
Convert the MyISAM tables to InnoDB before migration.
Why this is correct
InnoDB supports transactional dump with less locking.
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