> Azure Resource Manager supports the ability to **lock** resources, as a security control. Resource locks are applied to the resource, and are effective across all users and roles. There are two types of resource lock: **CanNotDelete** and **ReadOnly**. These lock types can be applied either to a Private DNS zone, or to an individual record set. **Applying a lock of either type against Private DNS Zone or individual record set may interfere with the ability of Azure Database for PostgreSQL flexible server to update DNS records** and cause issues during important operations on DNS, such as High Availability failover from primary to secondary. For these reasons, please make sure you are **not** utilizing DNS private zone or record locks when utilizing High Availability features with Azure Database for PostgreSQL flexible server.
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