- A
Set up AWS DMS ongoing replication to keep the target in sync after migration.
Why wrong: Ongoing replication is for minimal downtime migrations, but not a required step for all migrations.
- B
Use AWS Schema Conversion Tool (SCT) to convert the Oracle schema and stored procedures to PostgreSQL-compatible format.
SCT converts schema and code objects like stored procedures.
- C
Configure AWS DMS with full LOB mode to migrate large objects.
Full LOB mode ensures LOBs are migrated without truncation.
- D
Use AWS DMS native Oracle to PostgreSQL endpoint to migrate data without schema conversion.
Why wrong: DMS can migrate data, but schema conversion is typically done separately with SCT.
- E
Enable RDS Proxy to reduce connection overhead during migration.
Why wrong: RDS Proxy is for production connection pooling, not a migration step.
Quick Answer
The correct two steps are to use the AWS Schema Conversion Tool (SCT) to convert the Oracle stored procedures and to configure AWS DMS with full LOB mode for the data migration. SCT is essential here because Oracle PL/SQL and PostgreSQL PL/pgSQL have fundamentally different syntax and procedural logic; SCT automatically translates these schema objects, including functions and triggers, into a PostgreSQL-compatible format, which is critical when migrating complex database code. For the 2 TB of data containing large objects, AWS DMS must be set to full LOB mode to ensure that LOBs are migrated completely without truncation, as the default limited LOB mode would fail on large binary files. On the AWS Certified Database Specialty exam, this question tests your understanding of the division of labor between SCT (schema) and DMS (data), and a common trap is to assume DMS alone can handle schema conversion. Remember the memory tip: SCT for the Scripts (stored procedures), DMS for the Data (with full LOB for Large Objects).
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is planning to migrate a 2 TB Oracle database to Amazon Aurora PostgreSQL. The database contains large objects (LOBs) and uses stored procedures. Which TWO steps should the company take as part of the migration? (Choose two.)
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 Schema Conversion Tool (SCT) to convert the Oracle schema and stored procedures to PostgreSQL-compatible format.
Option B is correct because the AWS Schema Conversion Tool (SCT) is specifically designed to convert Oracle schema objects, including stored procedures, to PostgreSQL-compatible format. Since the migration involves stored procedures, SCT is necessary to handle the syntax and logic differences between Oracle PL/SQL and PostgreSQL PL/pgSQL, ensuring the target database schema is ready for migration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set up AWS DMS ongoing replication to keep the target in sync after migration.
Why it's wrong here
Ongoing replication is for minimal downtime migrations, but not a required step for all migrations.
- ✓
Use AWS Schema Conversion Tool (SCT) to convert the Oracle schema and stored procedures to PostgreSQL-compatible format.
Why this is correct
SCT converts schema and code objects like stored procedures.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure AWS DMS with full LOB mode to migrate large objects.
Why this is correct
Full LOB mode ensures LOBs are migrated without truncation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS DMS native Oracle to PostgreSQL endpoint to migrate data without schema conversion.
Why it's wrong here
DMS can migrate data, but schema conversion is typically done separately with SCT.
- ✗
Enable RDS Proxy to reduce connection overhead during migration.
Why it's wrong here
RDS Proxy is for production connection pooling, not a migration step.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that DMS can handle schema conversion automatically, but DMS only migrates data; schema conversion requires a separate tool like SCT.
Detailed technical explanation
How to think about this question
AWS SCT converts Oracle PL/SQL stored procedures to PostgreSQL PL/pgSQL, handling constructs like cursors, exception blocks, and bulk operations. For LOBs, AWS DMS full LOB mode ensures that large objects (e.g., BLOB, CLOB) are migrated without truncation by reading the entire LOB into memory, which is critical because limited LOB mode can truncate data beyond a configurable threshold (default 32 KB). In practice, if LOBs exceed the DMS task memory limit (default 64 MB per row), you may need to adjust the MaxLobSize parameter or use inline LOB mode for better performance.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS Schema Conversion Tool (SCT) to convert the Oracle schema and stored procedures to PostgreSQL-compatible format. — Option B is correct because the AWS Schema Conversion Tool (SCT) is specifically designed to convert Oracle schema objects, including stored procedures, to PostgreSQL-compatible format. Since the migration involves stored procedures, SCT is necessary to handle the syntax and logic differences between Oracle PL/SQL and PostgreSQL PL/pgSQL, ensuring the target database schema is ready for migration.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
4 more ways this is tested on DBS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company needs to migrate a 5 TB Oracle database to Amazon Aurora PostgreSQL. The company has a limited maintenance window and requires the migration to be completed within a few hours. Which approach should be used?
easy- A.Use AWS Schema Conversion Tool (AWS SCT) to convert the schema and AWS DMS for data migration
- B.Use pg_dump to export the Oracle database and pg_restore to import into Aurora
- ✓ C.Use AWS Database Migration Service (AWS DMS) to migrate the data
- D.Use AWS S3 to store the data and AWS Glue to transform and load into Aurora
Why C: AWS DMS can handle large data migrations efficiently. Option A is incorrect because pg_dump is for PostgreSQL, not Oracle. Option C is incorrect because S3 is not suitable for direct database migration. Option D is incorrect because AWS SCT is for schema conversion, not data migration.
Variation 2. A company wants to migrate its on-premises Oracle database to Amazon Aurora PostgreSQL. The company needs to automatically convert the Oracle schema to PostgreSQL-compatible format. Which AWS service should the company use?
easy- A.AWS Database Migration Service (AWS DMS) with the Oracle native dump and load option
- B.AWS Server Migration Service (AWS SMS)
- C.AWS Database Migration Service (AWS DMS)
- ✓ D.AWS Schema Conversion Tool (AWS SCT)
Why D: AWS Schema Conversion Tool (AWS SCT) is designed specifically to convert database schemas from one engine to another, including Oracle to Amazon Aurora PostgreSQL. It automatically translates Oracle DDL (tables, indexes, stored procedures, functions, etc.) into PostgreSQL-compatible format, handling data type mappings, PL/SQL to PL/pgSQL conversion, and other schema-level transformations. AWS DMS handles data migration, not schema conversion, making SCT the correct choice for this requirement.
Variation 3. A company wants to migrate its on-premises Oracle database to Amazon Aurora PostgreSQL. The company needs to convert the database schema and code from Oracle to PostgreSQL. Which AWS service should they use for schema conversion?
easy- A.AWS DMS
- B.AWS Glue
- ✓ C.AWS Schema Conversion Tool (SCT)
- D.AWS Database Migration Service
Why C: Option A is correct because AWS SCT (Schema Conversion Tool) is specifically designed to convert database schemas and code from one engine to another, including Oracle to PostgreSQL. Option B is wrong because AWS DMS focuses on data migration, not schema conversion. Option C is wrong because AWS Database Migration Service is for data migration, not conversion. Option D is wrong because AWS Glue is for ETL, not schema conversion.
Variation 4. A company wants to migrate an on-premises Oracle database to Amazon Aurora PostgreSQL. They need to convert the schema and code. Which AWS service should they use?
easy- ✓ A.AWS Schema Conversion Tool (SCT)
- B.AWS Lambda
- C.Amazon S3
- D.AWS Database Migration Service (DMS)
Why A: AWS SCT is designed for schema and code conversion between heterogeneous databases. Option A is correct. Option B (DMS) migrates data, not schema. Option C (S3) is storage. Option D (Lambda) is compute.
Last reviewed: Jun 30, 2026
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