DBS-C01 Deployment and Migration Practice Question
A company is migrating an on-premises Oracle database to Amazon RDS for Oracle. The migration uses AWS DMS with ongoing replication (CDC). Which TWO tasks must be completed before starting the migration?
⚠ Common exam trap
A common mix-up: candidates confuse Oracle's redo logging with MySQL's binary logging, leading them to incorrectly select 'Enable binary logging on the Oracle source' (Option E) instead of understanding that Oracle requires supplemental logging for CDC.
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 in the Oracle source database
AWS DMS requires supplemental logging to be enabled on the Oracle source database for ongoing replication (CDC). Supplemental logging ensures that the redo logs contain sufficient information (e.g., primary key, unique key, or all column values) to reconstruct the changes for DMS to capture and apply to the target. Without it, DMS cannot generate the necessary log-based change data for 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.
- ✓
Enable supplemental logging in the Oracle source database
Why this is correct
Supplemental logging is required for DMS to capture changes.
- ✓
Create an Oracle user with required privileges for DMS
Why this is correct
DMS needs a user with SELECT, LOGMINING, and other privileges.
- ✗
Configure DMS to use only full load without CDC
Why it's wrong here
This would not meet the ongoing replication requirement.
- ✗
Disable archive logging on the Oracle source
Why it's wrong here
Archive logging must be enabled for CDC.
- ✗
Enable binary logging on the Oracle source
Why it's wrong here
Binary logging is for MySQL, not Oracle.
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