DBS-C01 Deployment and Migration Practice Question
A company is migrating a self-managed PostgreSQL database with extensions (PostGIS, pg_stat_statements) to Amazon RDS for PostgreSQL. After migration, they find that the extensions are not available. What is the most likely cause?
⚠ Common exam trap
Test-takers frequently assume extensions are automatically available after migration, overlooking that certain extensions require explicit parameter group configuration and a reboot to load the shared library.
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 required extensions are not included in the default parameter group and must be manually added to shared_preload_libraries.
Amazon RDS for PostgreSQL does not automatically load extensions that require shared library preloading, such as pg_stat_statements. These extensions must be explicitly added to the `shared_preload_libraries` parameter in the DB parameter group. PostGIS, while not requiring preloading, must be created via `CREATE EXTENSION` after the extension files are present; however, the most likely cause of extensions not being available is that the custom parameter group was not configured to include the required libraries in `shared_preload_libraries`.
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 required extensions are not included in the default parameter group and must be manually added to shared_preload_libraries.
Why this is correct
Extensions need to be enabled via parameter group.
- ✗
The extensions are incompatible with the RDS engine version.
Why it's wrong here
PostGIS and pg_stat_statements are compatible.
- ✗
The RDS instance is not configured to allow extensions.
Why it's wrong here
Extensions are allowed by default.
- ✗
RDS does not support any PostgreSQL extensions.
Why it's wrong here
RDS supports many extensions.
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