DEA-C01 Data Operations and Support Practice Question
A company uses AWS DMS to replicate data from an on-premises Oracle database to Amazon RDS for MySQL. The full load completes successfully, but ongoing replication (CDC) is failing with a 'Failed to add supplemental logging' error. What should the data engineer do to resolve this issue?
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
✓
Enable supplemental logging on the source Oracle database manually.
The 'Failed to add supplemental logging' error occurs because AWS DMS requires supplemental logging on the source Oracle database for CDC to capture changes. DMS typically attempts to add supplemental logging automatically, but if it fails (e.g., due to insufficient privileges), the engineer must enable it manually. Option A is correct: enabling supplemental logging manually resolves the issue. Option B is incorrect because recreating the endpoint does not address the missing supplemental logging. Option C is incorrect because the target MySQL engine version is unrelated to the source Oracle logging requirement. Option D is incorrect because increasing the task log interval only affects log output frequency, not the underlying logging configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable supplemental logging on the source Oracle database manually.
Why this is correct
DMS requires supplemental logging for CDC.
- ✗
Recreate the DMS endpoint for the source database with a new connection.
Why it's wrong here
Recreating the endpoint does not enable supplemental logging.
- ✗
Modify the target MySQL database to use a different engine version.
Why it's wrong here
Target engine version is unrelated to source logging.
- ✗
Increase the task log interval in the DMS task settings.
Why it's wrong here
Log interval does not enable supplemental logging.
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