ExpertMedium1 markMultiple Choice
AZ-305 · Question 22 · Domain 2.1: Relational Data Storage
You are designing a high-availability architecture for an Azure Database for PostgreSQL Flexible Server.
The application requires zero data loss (RPO = 0) and automatic failover in the event of a datacenter outage within the primary Azure region. The solution must minimize failover time.
Which high availability configuration should you recommend?
You are designing a high-availability architecture for an Azure Database for PostgreSQL Flexible Server.
The application requires zero data loss (RPO = 0) and automatic failover in the event of a datacenter outage within the primary Azure region. The solution must minimize failover time.
Which high availability configuration should you recommend?
Answer options:
A.
Same-zone High Availability
B.
Zone-redundant High Availability
C.
Geo-redundant backup
D.
Read replicas in a different region
How to approach this question
Match 'datacenter outage' to Availability Zones. Match 'RPO=0' to synchronous replication (Zone-redundant HA).
Full Answer
B.Zone-redundant High Availability✓ Correct
Azure Database for PostgreSQL Flexible Server supports Zone-redundant High Availability. This configuration provisions a primary server in one Availability Zone and a standby server in another. Data is synchronously replicated to the standby, ensuring zero data loss (RPO=0). If the primary zone goes down, it automatically fails over to the standby.
Common mistakes
Confusing Geo-redundancy (cross-region, asynchronous, RPO>0) with Zone-redundancy (cross-datacenter, synchronous, RPO=0).
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