Availability improvements in SQL Server 2019
This section covers the new availability-related features and enhancements in SQL Server 2019.
Accelerated database recovery
Accelerated Database Recovery (ADR) is a feature that was introduced in Azure SQL Database but is now included in SQL Server 2019 for on-premises and IaaS deployments. ADR speeds up recovery when a database is brought online after a failover or an event where the database was not cleanly taken offline. Enabling ADR means databases will be online and ready for use by end users and applications faster, reducing downtime and unavailability.
Configuration-only replica
Although not new to SQL Server 2019, the concept of a configuration-only replica was introduced post-SQL Server 2017 in Cumulative Update 1. A configuration-only replica is required for a two-replica (primary and secondary) configuration when deploying AGs on Linux. To support the Standard edition and not impact licensing, a configuration...