Configure Hyperscale (Citus) high availability

APPLIES TO: Azure Database for PostgreSQL - Hyperscale (Citus)

Azure Database for PostgreSQL - Hyperscale (Citus) provides high availability (HA) to avoid database downtime. With HA enabled, every node in a server group will get a standby. If the original node becomes unhealthy, its standby will be promoted to replace it.

Important

Because HA doubles the number of servers in the group, it will also double the cost.

Enabling HA is possible during server group creation, or afterward in the Compute + storage tab for your server group in the Azure portal. The user interface looks similar in either case. Drag the slider for High availability from NO to YES:

Click the Save button to apply your selection. Enabling HA can take some time as the server group provisions standbys and streams data to them.

The Overview tab for the server group will list all nodes and their standbys, along with a High availability column indicating whether HA is successfully enabled for each node.

Next steps

Learn more about high availability.