Azure Synapse、Azure SQL 数据库、Azure 托管实例和本地 SQL Server 中的跨数据库查询

Question

我们正在寻找将我们的本地 SQL Server 迁移到 Azure 的选项，并试图了解如果我们的数据驻留在 Azure 中的多种数据库技术（特别是 Azure 托管）中，我们是否能够运行跨数据库查询实例、Azure Synapse Analytics、Azure SQL 数据库），以及在本地 SQL Server 实例中。

我们在任何地方都找不到太多关于这些是否受支持的信息，如果你们能帮助填写下表，我们将不胜感激：

TO->	Azure SQL DB	Azure Managed Instance	Azure Synapse Analytics	On Premise SQL Server
Azure SQL DB	Supported through Elastic Search Query (Ref: https://azure.microsoft.com/en-us/blog/querying-remote-databases-in-azure-sql-db/)	?	Azure Data Share supports sharing of both tables and views from Azure SQL Database and Azure Synapse Analytics (formerly Azure SQL DW), and sharing of tables from Azure Synapse Analytics (workspace) dedicated SQL pool. Sharing from Azure Synapse Analytics (workspace) serverless SQL pool is not currently supported. (Ref: https://docs.microsoft.com/en-us/azure/data-share/how-to-share-from-sql)	Azure SQL database doesn't support the linked server property so you wont be able to access on prem tables in Azure SQL database and the elastic query in Azure SQL database is to query tables between 2 Azure SQL databases and not On prem. (Ref: https://docs.microsoft.com/en-us/answers/questions/289105/how-can-i-query-on-premise-sql-server-database-fro.html)
Azure Managed Instance	?	?	?	Available through the use of Linked Servers (Ref: http://thewindowsupdate.com/2019/03/22/lesson-learned-81-how-to-create-a-linked-server-from-azure-sql-managed-instance-to-sql-server-onpremise-or-azure-vm/)
Azure Synapse Analytics	?	?	?	?
On Premise SQL Server	?	?	?	Using a linked server you can query data in an Azure SQL database from an on premised SQL Server (Ref: https://docs.microsoft.com/en-us/answers/questions/289105/how-can-i-query-on-premise-sql-server-database-fro.html)

Answer 1

AFAIK 没有跨数据库外观，它提供一个接口来同时与多个数据库通信。无论是本地/云端还是 SQL-Server/Synapse/MySQL/...

您可以通过多种方式和方式从某个地方/任何地方访问单个数据库。例如。从云中的代码访问本地数据库或从本地“服务器”上运行的代码访问云数据库。可用接口列表特定于每个“源”和“目标”组合。

Answer 2

Azure SQL 数据库需要elastic query 来实现跨数据库查询。不支持创建链接服务器。

Azure 托管实例与本地 SQL Server 具有几乎相同的功能，您可以使用 USE statement 执行跨数据库查询。本地 SQL Server 也一样。

Azure Synapse Analytics 也不支持跨数据库查询。

根据我的知识和经验，我会将✔或X放在表中以表示支持或不支持。请参考：

TO->	Azure SQL DB	Azure Managed Instance	Azure Synapse Analytics	On Premise SQL Server
Azure SQL DB	Supported through Elastic Search Query (Ref: https://azure.microsoft.com/en-us/blog/querying-remote-databases-in-azure-sql-db/)	X, not supported	Azure Data Share supports sharing of both tables and views from Azure SQL Database and Azure Synapse Analytics (formerly Azure SQL DW), and sharing of tables from Azure Synapse Analytics (workspace) dedicated SQL pool. Sharing from Azure Synapse Analytics (workspace) serverless SQL pool is not currently supported. (Ref: https://docs.microsoft.com/en-us/azure/data-share/how-to-share-from-sql)	Azure SQL database doesn't support the linked server property so you wont be able to access on prem tables in Azure SQL database and the elastic query in Azure SQL database is to query tables between 2 Azure SQL databases and not On prem. (Ref: https://docs.microsoft.com/en-us/answers/questions/289105/how-can-i-query-on-premise-sql-server-database-fro.html)
Azure Managed Instance	X, not supported	✔,same with local SQL Server	X, not supported	Available through the use of Linked Servers (Ref: http://thewindowsupdate.com/2019/03/22/lesson-learned-81-how-to-create-a-linked-server-from-azure-sql-managed-instance-to-sql-server-onpremise-or-azure-vm/)
Azure Synapse Analytics	Azure Data Share	X, not supported	X, not supported	X, not supported
On Premise SQL Server	✔,linked server	✔,linked server	X, not supported	Using a linked server you can query data in an Azure SQL database from an on premised SQL Server (Ref: https://docs.microsoft.com/en-us/answers/questions/289105/how-can-i-query-on-premise-sql-server-database-fro.html)

请根据您的要求选择合适的 Azure 数据库版本。

HTH。