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Do you need to upgrade to SQL Server 2019?
For SQL Server 2008, and SQL Server 2008 R2, you’ll either need to do a side-by-side upgrade, or a migration, to move to SQL Server 2019 (15.x) as there is no common overlap between a supported mainstream operating system. Before running setup to upgrade, review the following articles about the upgrade process and the release notes.
Can You migrate SQL Server 2016 to Windows Server 2019?
For this, we will have to migrate our SQL server 2016 (2 instances Running in windows cluster) to new Windows Server 2019 Standard server machines.
How to choose the correct upgrade method for SQL Server?
Choose a database engine upgrade method: To upgrade in the correct order, select the appropriate upgrade method and steps based on your review of supported version and edition upgrades and also based on other components installed in your environment.
How often does SQL Server Upgrade availability group replicas?
Suppose you are running three AGs on three server nodes with all replicas in synchronous commit mode as shown in the following table: It may be appropriate in your situation to perform a load-balanced rolling upgrade in the following sequence: This upgrade sequence has an average downtime of fewer than two failovers per AG.
How to upgrade the second availability group in SQL Server?
General steps to upgrade a distributed availability group Backup all databases, including system databases, and those participating in the availability group. Upgrade and restart all secondary replicas of the second availability group (the downstream). Upgrade and restart all secondary replicas of the first availability group (the upstream).
Can You migrate from SQL Server 2008 to SQL Server 2019?
You can migrate databases from older versions. For example, you can migrate databases from SQL Server 2008 R2 to SQL Server 2019. For information, see Azure Database Migration Guide. The following tips and tools can help you plan and implement your migration.