The correct design is to use a single Aurora cluster with a separate schema per tenant and implement row-level security (RLS) policies. This approach directly satisfies the requirements for multi-tenant cross-tenant reporting with row-level security because RLS policies automatically filter query results based on the current session’s tenant context, enabling strict access controls even when reporting across tenants. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of balancing tenant isolation with operational efficiency—a common trap is choosing separate databases per tenant, which complicates cross-tenant queries and increases overhead. Remember that schema-per-tenant with RLS gives you both strong isolation and the ability to run unified reporting queries without compromising security. A useful memory tip: think of RLS as a “dynamic WHERE clause” that invisibly enforces tenant boundaries, making it ideal for mixed-size tenants where you want one cluster but per-tenant data guards.
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 designing a multi-tenant SaaS application using Amazon Aurora PostgreSQL. Each tenant's data must be isolated for security and compliance. The application has a few large tenants and many small tenants. Queries must be able to access data across tenants for reporting, but with strict access controls. Which design best meets these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a single Aurora cluster with a separate schema per tenant and implement row-level security policies.
Option A is correct because it uses a single Aurora cluster with a separate schema per tenant and row-level security (RLS) policies. This design provides strong tenant isolation at the schema level while allowing cross-tenant reporting queries with strict access controls enforced by RLS policies, which automatically filter rows based on the current session's tenant context. It balances security, compliance, and operational efficiency for a mix of large and small tenants.
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.
✓
Use a single Aurora cluster with a separate schema per tenant and implement row-level security policies.
Why this is correct
Schemas provide logical isolation and RLS enforces access controls per tenant.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a separate database per tenant in the same Aurora cluster.
Why it's wrong here
Too many databases for small tenants leads to management overhead and connection limits.
✗
Create a separate Aurora cluster per tenant.
Why it's wrong here
Cost prohibitive for many small tenants.
✗
Use a single Aurora cluster with a single schema but add a tenant_id column to every table.
Why it's wrong here
Without RLS, queries can inadvertently access other tenants' data; also reporting becomes complex.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume that physical separation (separate clusters or databases) is always required for compliance, but Aurora PostgreSQL's row-level security can provide logical isolation that meets security requirements while enabling efficient cross-tenant reporting.
Detailed technical explanation
How to think about this question
Row-level security in Aurora PostgreSQL works by creating security policies that are bound to tables, using a `USING` expression that references session-level variables (e.g., `current_setting('app.tenant_id')`) to filter rows automatically. This allows cross-tenant reporting queries to run with a single connection while ensuring each tenant's data is only visible when the correct tenant context is set, and the policies are enforced even if the application layer is compromised. In practice, RLS policies can be combined with `SET SESSION` commands to switch tenant context without reconnecting, making it efficient for multi-tenant SaaS workloads.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a single Aurora cluster with a separate schema per tenant and implement row-level security policies. — Option A is correct because it uses a single Aurora cluster with a separate schema per tenant and row-level security (RLS) policies. This design provides strong tenant isolation at the schema level while allowing cross-tenant reporting queries with strict access controls enforced by RLS policies, which automatically filter rows based on the current session's tenant context. It balances security, compliance, and operational efficiency for a mix of large and small tenants.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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