The answer is Azure SQL Managed Instance because it is the only Azure relational database service that provides near 100% compatibility with legacy SQL Server, including full support for CLR assemblies, stored procedures, triggers, and cross-database queries, while also offering built-in high availability with automatic failover. For the DP-900 exam, this question tests your understanding of when to choose Azure SQL Managed Instance over Azure SQL Database or SQL Server on Azure VM—a common trap is assuming Azure SQL Database can handle all legacy features, but it lacks CLR and cross-database support, while SQL Server on Azure VM forces you to manage high availability manually. Remember the memory tip: "Managed Instance means maximum compatibility without the management overhead"—if your legacy SQL Server relies on instance-level features like CLR or linked servers, Managed Instance is the automatic choice for a seamless migration.
DP-900 Practice Question: Identify considerations for relational data on Azure
This DP-900 practice question tests your understanding of identify considerations for relational data on azure. 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.
You are the database administrator for a large financial institution migrating their core banking system to Azure. The system uses SQL Server with many stored procedures, triggers, and CLR assemblies. The database is 2 TB and growing. The migration must minimize application changes and support high availability with automatic failover. You need to select an Azure relational database service. What should you choose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure SQL Managed Instance
Option C is correct because Azure SQL Managed Instance provides near 100% compatibility with SQL Server, supports CLR, and offers high availability with automatic failover. Option A (Azure SQL Database) lacks support for CLR and cross-database queries. Option B (SQL Server on Azure VM) requires manual high availability setup. Option D (Azure Database for PostgreSQL) requires significant application changes.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Azure SQL Database
Why it's wrong here
Does not support CLR or cross-database queries, requiring application changes.
✗
Azure Database for PostgreSQL
Why it's wrong here
Different database engine, requiring significant application rewrite.
✗
SQL Server on Azure Virtual Machines
Why it's wrong here
Requires manual configuration for high availability (e.g., Always On Availability Groups).
✓
Azure SQL Managed Instance
Why this is correct
Offers high compatibility, supports CLR, and provides built-in high availability.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-900 NAT questions on configuration and troubleshooting.
Identify considerations for relational data on Azure — This question tests Identify considerations for relational data on Azure — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Azure SQL Managed Instance — Option C is correct because Azure SQL Managed Instance provides near 100% compatibility with SQL Server, supports CLR, and offers high availability with automatic failover. Option A (Azure SQL Database) lacks support for CLR and cross-database queries. Option B (SQL Server on Azure VM) requires manual high availability setup. Option D (Azure Database for PostgreSQL) requires significant application changes.
What should I do if I get this DP-900 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-900 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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