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Does ADO.NET support multi-subnet failover for SQL connections, and how does this feature compare to ODBC's multi-subnet failover support?

YONG Chee Wee 1 Reputation point
2024-06-10T10:06:11.2266667+00:00

I am using ADO.NET for SQL connections. Does ADO.NET support multi-subnet failover? I understand that ODBC supports multi-subnet failover. Can you explain the difference between ADO.NET and ODBC in this regard?

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  1. Erland Sommarskog 112.8K Reputation points
    2024-06-10T20:46:28.96+00:00

    Depends on what you mean with ADO .Net, but I will assume that you mean SqlClient. And, yes, SqlClient suppotrs MultiSubnetFailover, see https://learn.microsoft.com/en-us/dotnet/framework/data/adonet/sql/sqlclient-support-for-high-availability-disaster-recovery

    I would expect any differences between SqlClient and ODBC with regards this connection-string property. But since they are different implementations, there may be subtle differences.

  2. Jiale Xue - MSFT 46,636 Reputation points Microsoft Vendor
    2024-06-27T08:41:58.46+00:00

    Hi @YONG Chee Wee , Welcome to Microsoft Q&A,

    When choosing SQLClient (ADO.NET) or ODBC driver for high availability (HA) and disaster recovery (DR) setups, you must consider performance, ease of use, feature support, and specific usage scenarios.

    SQLClient is part of ADO.NET and is designed specifically for .NET applications, providing seamless integration with the .NET Framework. It takes full advantage of advanced features of SQL Server, including AlwaysOn Availability Groups, Transparent Data Encryption, and multi-subnet failover support. It is optimized specifically for SQL Server and the .NET platform, and in most cases, performs better than general-purpose ODBC drivers. It is optimized specifically for SQL Server and has limited support for other database systems.

    ODBC is a general-purpose database access interface that supports multiple operating systems and programming languages. ODBC drivers can connect to a variety of database systems, not limited to SQL Server. As a standard interface, ODBC provides a consistent API, making it easier to switch between different database systems.

    HA/DR setup for SQL Server: SQLClient provides optimized performance and functional support in SQL Server environments, especially support for AlwaysOn availability groups and multi-subnet failover. It takes advantage of advanced features of SQL Server to better meet the needs of high availability and disaster recovery.

    Cross-platform and multi-database environment: If your application needs to support multiple database systems or needs to run on different operating systems, ODBC is a better choice. It provides wide database compatibility and cross-platform support.

    Best Regards,

    Jiale

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