Question 1,436 of 1,446
PCDE Migrate data solutions Practice Question
During a DMS continuous migration from MySQL to Cloud SQL, the full dump phase completed successfully, but the CDC phase is failing with 'Error: binary log not found' after a few minutes. The source MySQL has binary logs enabled. What is the most likely cause?
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 binary logs were purged due to a short binlog_expire_logs_seconds setting.
DMS requires that binary logs are retained until the CDC phase has consumed them. If logs expire due to a short binlog retention period (e.g., default 1 day), the migration fails. The source should have binlog retention set to 7 days or more.
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 binary logs were purged due to a short binlog_expire_logs_seconds setting.
Why this is correct
If logs expire before DMS consumes them, DMS cannot continue CDC.
- ✗
The DMS connection profile has incorrect SSL settings.
Why it's wrong here
SSL issues would cause connection errors, not missing logs.
- ✗
The source database was restarted and binary logs were reset.
Why it's wrong here
Restart does not purge existing binary logs unless configured.
- ✗
The source MySQL server has run out of disk space.
Why it's wrong here
This would cause a different error, not 'binary log not found'.
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Last reviewed: Jul 4, 2026
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