The answer is enabling zone redundancy on the Business Critical tier. This configuration ensures that your Azure SQL Database maintains availability during a zonal failure with zero data loss because it deploys multiple synchronous replicas across distinct availability zones within the same region. Since all transactions are synchronously committed to at least three replicas before acknowledgment, an automatic failover to a replica in a healthy zone preserves every committed transaction without any data loss. On the DP-300 exam, this scenario tests your understanding of high-availability architectures under the Business Critical service tier, often appearing as a direct question about meeting a strict RPO of zero. A common trap is confusing zone redundancy with the General Purpose tier’s zone-redundant backup storage, which does not guarantee zero data loss during a zonal outage. Memory tip: think “Business Critical + Zone Redundancy = Zero Data Loss Guarantee,” or simply remember that synchronous replication across zones is the key to surviving a zonal failure without losing a single transaction.
DP-300 Plan and implement data platform resources Practice Question
This DP-300 practice question tests your understanding of plan and implement data platform resources. 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.
Exhibit
Refer to the exhibit.
```
RESOURCE GROUP: rg-sql-prod
LOCATION: eastus
SERVER NAME: sqlprod-server
DATABASE NAME: SalesDB
SERVICE TIER: BusinessCritical
COMPUTE: Gen5, 8 vCores
STORAGE: 500 GB
BACKUP STORAGE REDUNDANCY: Geo
ZONE REDUNDANCY: Enabled
```
You are evaluating the configuration of an Azure SQL Database as shown in the exhibit. You need to ensure that the database remains available during a zonal failure without data loss. Which feature contributes to this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Zone redundancy enabled on Business Critical tier.
Zone redundancy on the Business Critical tier ensures that database replicas are placed in different availability zones within the same Azure region. During a zonal failure, the service automatically fails over to a synchronous replica in another zone, guaranteeing zero data loss because all transactions are synchronously committed across replicas. This directly meets the requirement of remaining available without data loss during a zonal outage.
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.
✗
General Purpose service tier.
Why it's wrong here
General Purpose does not offer zone-redundant synchronous replication.
✗
Read scale-out.
Why it's wrong here
Read scale-out is for read workloads.
✗
Geo-redundant backup storage.
Why it's wrong here
Backup storage redundancy does not affect live database availability.
✓
Zone redundancy enabled on Business Critical tier.
Why this is correct
Zone redundancy provides synchronous replication across zones.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse zone redundancy (which protects within a region) with geo-redundancy (which protects across regions), or assume that any service tier with high availability features (like General Purpose) can guarantee zero data loss during a zonal failure, when only the Business Critical tier with zone redundancy provides synchronous replication and automatic failover without data loss.
Detailed technical explanation
How to think about this question
Under the hood, the Business Critical tier uses a quorum-based commit model with three or more synchronous replicas (including the primary) in different availability zones. The database uses Always On Availability Groups technology to ensure that a transaction is not acknowledged until it is hardened on at least two replicas, guaranteeing RPO=0. In a real-world scenario, if a zone hosting the primary replica experiences a power outage, the system automatically promotes a secondary replica from another zone within seconds, with no data loss and minimal downtime.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 question in full detail.
Plan and implement data platform resources — This question tests Plan and implement data platform resources — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Zone redundancy enabled on Business Critical tier. — Zone redundancy on the Business Critical tier ensures that database replicas are placed in different availability zones within the same Azure region. During a zonal failure, the service automatically fails over to a synchronous replica in another zone, guaranteeing zero data loss because all transactions are synchronously committed across replicas. This directly meets the requirement of remaining available without data loss during a zonal outage.
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.
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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