The answer is Azure SQL Database Managed Instance with active geo-replication and zone redundancy. This combination directly supports migrating Oracle to Azure SQL Managed Instance high availability because Managed Instance provides native Oracle compatibility for ACID transactions, while active geo-replication enables automatic failover to a secondary region, and zone redundancy ensures high availability within a single region with minimal downtime during maintenance. On the AZ-305 exam, this question tests your ability to pair migration requirements with Azure’s high-availability features, often trapping candidates who choose Cosmos DB (NoSQL, not fully ACID) or PostgreSQL (not optimized for Oracle migration). A key memory tip: think “Oracle + ACID + failover = Managed Instance with geo-replication and zone redundancy” — the three services form a triangle of regional resilience, cross-region disaster recovery, and transactional integrity.
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 plans to migrate its on-premises Oracle database to Azure. The database is currently 2 TB and experiences high write throughput. The solution must support: - ACID transactions - Automatic failover to a secondary region - Minimal downtime during maintenance. Which three Azure services should the company include in the solution? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure SQL Database Managed Instance
Option A is correct because Azure SQL Database Managed Instance supports native Oracle migration and ACID transactions. Option B is correct because active geo-replication provides automatic failover to a secondary region. Option D is correct because Azure SQL Database zone-redundant configuration ensures high availability within a region. Option C is wrong because Azure Cosmos DB is NoSQL and not ACID for multi-document transactions. Option E is wrong because Azure Database for PostgreSQL is not optimized for Oracle migration.
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 Managed Instance
Why this is correct
Supports ACID transactions and has Oracle migration tools.
Related concept
Static NAT maps one inside address to one outside address.
✓
Azure SQL Database zone-redundant configuration
Why this is correct
Ensures high availability within a region.
Related concept
Static NAT maps one inside address to one outside address.
✗
Azure Cosmos DB with SQL API
Why it's wrong here
Does not fully support ACID transactions for complex queries.
✗
Azure Database for PostgreSQL - Hyperscale (Citus)
Why it's wrong here
Not designed for Oracle migration.
✓
Azure SQL Database active geo-replication
Why this is correct
Provides automatic failover to a secondary region.
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 AZ-305 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 AZ-305 NAT questions on configuration and troubleshooting.
Design data storage solutions — This question tests Design data storage solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Azure SQL Database Managed Instance — Option A is correct because Azure SQL Database Managed Instance supports native Oracle migration and ACID transactions. Option B is correct because active geo-replication provides automatic failover to a secondary region. Option D is correct because Azure SQL Database zone-redundant configuration ensures high availability within a region. Option C is wrong because Azure Cosmos DB is NoSQL and not ACID for multi-document transactions. Option E is wrong because Azure Database for PostgreSQL is not optimized for Oracle migration.
What should I do if I get this AZ-305 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 AZ-305 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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 →
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. Your company is migrating on-premises Oracle databases to Azure. The new solution must support a minimum of 99.99% availability SLA and allow for schema changes with minimal downtime. What should you recommend?
medium
A.Azure SQL Managed Instance Business Critical tier
B.Azure Cosmos DB for PostgreSQL
✓ C.Azure SQL Database Business Critical tier with zone redundancy
D.Azure Virtual Machines running Oracle Database with Availability Zones
Why C: Azure SQL Database Business Critical tier with zone redundancy provides a 99.995% SLA, exceeding the 99.99% requirement, and supports online schema changes with minimal downtime via features like online index operations and schema modification with minimal blocking. Zone redundancy replicates data across three Azure Availability Zones within a region, ensuring high availability and automatic failover without data loss.
Last reviewed: Jun 20, 2026
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This AZ-305 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-305 exam.
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