How does high availability work in Flexible Server?

Flexible Server offers two HA modes: same-zone HA (standby in the same availability zone) and zone-redundant HA (standby in a different zone). Zone-redundant HA protects against entire zone failures. Both modes use synchronous replication for zero data loss. Failover is automatic and typically completes in 60-120 seconds. The HA standby doubles your compute cost but uses shared storage, so storage costs do not double. You can also stop HA temporarily (for maintenance windows) to save costs during planned downtime.

What PostgreSQL extensions are available?

Flexible Server supports a wide range of extensions including PostGIS (geospatial), pgvector (vector similarity search for AI), pg_cron (job scheduling), pg_stat_statements (query performance), pgAudit (auditing), pg_partman (partition management), and many more. Some extensions like pgvector and pg_cron require adding them to shared_preload_libraries via server parameters, which triggers a server restart. Extension availability may vary by PostgreSQL version — check the Azure documentation for your specific version.

Azure PostgreSQL Flexible Cost Estimator

StorageAzure

Estimate Azure PostgreSQL Flexible Server costs with extensions and HA.

Azure PostgreSQL Flexible Server Configuration

Compute Tier

Storage (GB)

Backup Storage (GB)

Backup storage at $0.095/GB/month.

High Availability (Zone Redundant - doubles compute cost)

Read Replicas (0-5)

Each replica costs the same as a single compute instance.

Raw Output

Output will appear here...

About This Tool

Azure Database for PostgreSQL Flexible Server is the next-generation managed PostgreSQL service on Azure, providing full PostgreSQL compatibility with built-in high availability, intelligent performance tuning, and granular cost controls. Pricing components include compute tier and size, storage (with auto-grow), IOPS provisioning, backup retention, high availability mode (same-zone or zone-redundant), and optional features like PgBouncer connection pooling and supported extensions. This estimator helps you model total monthly costs for different deployment configurations and compare tier options.

When to Use This Tool

•Estimating costs for a production PostgreSQL deployment with zone-redundant HA, 512 GB storage, and 10,000 IOPS
•Comparing costs of General Purpose D4ds_v5 versus Memory Optimized Eds_v5 for a read-heavy analytics workload
•Calculating the cost savings of using Burstable tier with stopped compute for development databases

Frequently Asked Questions

How does high availability work in Flexible Server?: Flexible Server offers two HA modes: same-zone HA (standby in the same availability zone) and zone-redundant HA (standby in a different zone). Zone-redundant HA protects against entire zone failures. Both modes use synchronous replication for zero data loss. Failover is automatic and typically completes in 60-120 seconds. The HA standby doubles your compute cost but uses shared storage, so storage costs do not double. You can also stop HA temporarily (for maintenance windows) to save costs during planned downtime.
What PostgreSQL extensions are available?: Flexible Server supports a wide range of extensions including PostGIS (geospatial), pgvector (vector similarity search for AI), pg_cron (job scheduling), pg_stat_statements (query performance), pgAudit (auditing), pg_partman (partition management), and many more. Some extensions like pgvector and pg_cron require adding them to shared_preload_libraries via server parameters, which triggers a server restart. Extension availability may vary by PostgreSQL version — check the Azure documentation for your specific version.

Related Learning Guides

Cost Management Guide24 min read

Disclaimer: This tool runs entirely in your browser. No data is sent to our servers. Always verify outputs before using them in production. AWS, Azure, and GCP are trademarks of their respective owners.