Plan and configure a high availability and disaster recovery environment →mediumMultiple SelectObjective-mapped
DP-300 Practice Question: Plan and configure a high availability and disaster recovery environment
You are designing high availability for a critical Azure SQL Database. The database is 1 TB in size and requires an RPO of 0 (zero data loss) and an RTO of less than 30 seconds. Which TWO configurations can meet these requirements?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Business Critical service tier with zone redundancy enabled.
Options A and C are correct. For zero data loss (RPO=0), synchronous replication is required. Business Critical (option A) with zone redundancy provides synchronous replicas within the same region and automatic failover, meeting both RPO=0 and RTO<30 seconds. Hyperscale (option C) also offers zone redundancy with synchronous log replication, enabling rapid failover without data loss. Option B (auto-failover group with same-region secondary) uses asynchronous replication, so data loss can occur. Option D (General Purpose) uses asynchronous replication as well and cannot guarantee zero data loss. Option E (active geo-replication) is also asynchronous, so it does not meet the RPO requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Business Critical service tier with zone redundancy enabled.
Why this is correct
Business Critical with zone redundancy uses three synchronous replicas across zones, ensuring zero data loss and fast failover.
- ✗
Auto-failover group with a secondary in the same region.
Why it's wrong here
Failover groups use asynchronous geo-replication, so RPO > 0.
- ✓
Hyperscale service tier with zone redundancy enabled.
Why this is correct
Hyperscale with zone redundancy uses synchronous log replication across zones, providing zero data loss and fast failover.
- ✗
General Purpose service tier with zone redundancy enabled.
Why it's wrong here
General Purpose uses asynchronous replication and does not guarantee zero data loss.
- ✗
Active geo-replication to a secondary in a different region.
Why it's wrong here
Geo-replication is asynchronous, so data loss may occur (RPO > 0).
Go deeper
Related to this question
Learn chapter
Overview of Azure Data Platform Options
Key term
Azure SQL Performance Tuning
Azure SQL Performance Tuning is the process of optimizing the speed and efficiency of queries and database operations in Microsoft Azure SQL Database or SQL Managed Instance to reduce latency and improve throughput.
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