Question 1,468 of 1,663
DBS-C01 Workload-Specific Database Design Practice Question
A company is migrating an on-premises Oracle OLTP database to Amazon Aurora PostgreSQL. The database has a complex schema with stored procedures, triggers, and sequences. During the migration, the team notices that the conversion tool reports several incompatibilities. Which strategy should the team use to handle the database schema changes with minimal downtime?
⚠ Common exam trap
Many exam-takers assume Babelfish can handle Oracle PL/SQL because it supports SQL Server T-SQL, but Babelfish is specifically for SQL Server compatibility, not Oracle.
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
✓
Use AWS Database Migration Service (DMS) with the AWS Schema Conversion Tool (SCT) to convert the schema and migrate data, then handle remaining incompatibilities during a cutover window.
AWS DMS with SCT is the recommended approach for heterogeneous migrations like Oracle to Aurora PostgreSQL. SCT converts the schema (including stored procedures, triggers, and sequences) and identifies incompatibilities, while DMS handles ongoing replication to minimize downtime. The remaining incompatibilities can be resolved during a planned cutover window, which is the standard strategy for complex schema migrations with minimal downtime.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy Amazon RDS for PostgreSQL with Babelfish to run Oracle PL/SQL code natively.
Why it's wrong here
Babelfish is for SQL Server compatibility, not Oracle.
- ✓
Use AWS Database Migration Service (DMS) with the AWS Schema Conversion Tool (SCT) to convert the schema and migrate data, then handle remaining incompatibilities during a cutover window.
Why this is correct
SCT automates schema conversion, and DMS supports minimal downtime via ongoing replication.
- ✗
Use pg_dump and pg_restore to migrate the schema, and then test and fix any errors.
Why it's wrong here
pg_dump/pg_restore cannot convert Oracle schema; they are for PostgreSQL-to-PostgreSQL migrations.
- ✗
Manually rewrite all stored procedures and triggers to PostgreSQL syntax before migration.
Why it's wrong here
Manual conversion is time-consuming and prone to errors; automated tools are preferred.
Visual reference
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Last reviewed: Jul 4, 2026
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