The answer is to enable Always Encrypted with secure enclaves and use a column master key that supports enclave computations. This is correct because standard Always Encrypted protects data at rest and in transit but prevents server-side operations like pattern matching on encrypted columns. Secure enclaves, such as Intel SGX, create a trusted execution environment inside the SQL Server engine, allowing computations like LIKE, equality, and comparisons directly on the encrypted data. For this to work, the column master key must be enclave-enabled, which authorizes the enclave to decrypt and process the data securely. On the DP-300 exam, this scenario tests your understanding of balancing security with query functionality; a common trap is assuming that simply enabling Always Encrypted is enough for pattern matching, or that client-side decryption is required. Remember the key tip: "Enclave for LIKE" — if you need to search encrypted columns, you must pair Always Encrypted with a secure enclave and an enclave-enabled key.
DP-300 Implement a secure environment Practice Question
This DP-300 practice question tests your understanding of implement a secure environment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Your company uses Azure SQL Database and needs to protect sensitive columns (e.g., credit card numbers) from being accessed by unauthorized users. You implement Always Encrypted. However, some queries that perform pattern matching on the encrypted column are failing because the column cannot be searched. What should you do to allow pattern matching while maintaining security?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Always Encrypted with secure enclaves and use a column master key that supports enclave computations.
Always Encrypted with secure enclaves allows computations, including pattern matching (LIKE, equality, comparisons), on encrypted columns by using a trusted execution environment (e.g., Intel SGX). The column master key must support enclave computations (enclave-enabled key) to permit the SQL Server engine to offload operations to the enclave. This preserves encryption at rest and in transit while enabling rich query patterns.
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.
✓
Enable Always Encrypted with secure enclaves and use a column master key that supports enclave computations.
Why this is correct
Secure enclaves enable rich computations on encrypted data, including pattern matching.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement row-level security (RLS) to filter rows based on user identity.
Why it's wrong here
RLS controls row access, not column encryption or pattern matching.
✗
Change the encryption type from randomized to deterministic encryption.
Why it's wrong here
Deterministic encryption allows equality searches but not pattern matching.
✗
Use Dynamic Data Masking (DDM) to mask the column for unauthorized users instead of encryption.
Why it's wrong here
DDM does not encrypt data; authorized users can still see plaintext.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse deterministic encryption (which enables equality) with the ability to perform pattern matching, or they mistakenly think Dynamic Data Masking or row-level security can substitute for encrypted search capabilities.
Detailed technical explanation
How to think about this question
Secure enclaves use a hardware-based trusted execution environment (TEE) like Intel SGX or AMD SEV-SNP, where the column encryption key is decrypted inside the enclave and never exposed to the SQL Server host OS. The enclave supports operations such as LIKE, pattern matching, and sorting by performing computations on the encrypted data within the enclave memory. A subtle behavior is that the column master key must be stored in Azure Key Vault or Windows Certificate Store with the enclave-enabled property set to true, and the database must be configured with the enclave type set to 'VBS' or 'SGX' depending on the environment.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 question in full detail.
Implement a secure environment — This question tests Implement a secure environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Always Encrypted with secure enclaves and use a column master key that supports enclave computations. — Always Encrypted with secure enclaves allows computations, including pattern matching (LIKE, equality, comparisons), on encrypted columns by using a trusted execution environment (e.g., Intel SGX). The column master key must support enclave computations (enclave-enabled key) to permit the SQL Server engine to offload operations to the enclave. This preserves encryption at rest and in transit while enabling rich query patterns.
What should I do if I get this DP-300 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: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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