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Upgrading an engine with SQL Server AG virtual database

Upgrading an engine involves quiescing and enabling the datasets. 

Tunable default value description 

By default, the MSSQL_ALLOW_QUIESCE_AG_VIRTUAL_SOURCES is set to true, upgrade attempts quiesce for the AG virtual database. If set to false, quiesce will not be attempted. 

Upgrade concerns 

  • Fast disable is not supported for the SQL Server AG virtual database. Thus, quiesce for SQL Server AG virtual database will always unmount and unexport the dataset. 

  • Quiescing of the SQL Server AG virtual database is only performed when the SQL Server AG virtual database is in Running status. 

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