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@paulmedynski paulmedynski released this 27 Jun 23:15
· 147 commits to main since this release
v6.1.0-preview2
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Preview Release 6.1.0-preview2.25178.5 - 2025-06-27

This update brings the following changes since the 6.1.0-preview1 release:

Added

Added dedicated SQL Server vector datatype support

What Changed:

  • Optimized vector communications between MDS and SQL Server 2025, employing a custom binary format over the TDS protocol. (#3433, #3443)
  • Reduced processing load compared to existing JSON-based vector support.
  • Initial support for 32-bit single-precision floating point vectors.

Who Benefits:

  • Applications moving large vector data sets will see beneficial improvements to processing times and memory requirements.
  • Vector-specific APIs are ready to support future numeric representations with a consistent look-and-feel.

Impact:

  • Reduced transmission and processing times for vector operations versus JSON using SQL Server 2025 preview:
    • Reads: 50x improvement
    • Writes: 3.3x improvement
    • Bulk Copy: 19x improvement
    • (Observed with vector column of max 1998 size, and 10,000 records for each operation.)
  • Improved memory footprint due to the elimination of JSON serialization/deserialization and string representation bloat.
  • For backwards compatibility with earlier SQL Server Vector implementations, applications may continue to use JSON strings to send/receive vector data, although they will not see any of the performance improvements noted above.

Revived .NET Standard 2.0 target support

What Changed:

  • Support for targeting .NET Standard 2.0 has returned. (#3381)
  • Support had previously been removed in the 6.0 release, with the [community voicing concerns] (#3115).

Who Benefits:

  • Libraries that depend on MDS may seamlessly target any of the following frameworks:
    • .NET Standard 2.0
    • .NET Framework 4.6.2 and above
    • .NET 8.0
    • .NET 9.0
  • Applications should continue to target runtimes.
    • The MDS .NET Standard 2.0 target framework support does not include an actual implementation, and cannot be used with a runtime.
    • An application's build/publish process should always pick the appropriate MDS .NET/.NET Framework runtime implementation.
    • Custom build/publish actions that incorrectly try to deploy the MDS .NET Standard 2.0 reference DLL at runtime are not supported.

Impact:

  • Libraries targeting .NET Standard 2.0 will no longer receive warnings like this:
    • warning NU1701: Package 'Microsoft.Data.SqlClient 6.0.2' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework '.NETStandard,Version=v2.0'. This package may not be fully compatible with your project.

Fixed

  • Fixed missing <NeutralLanguage> property. (#3325)
  • Fixed injection of UTF-8 BOM during bulk copy. (#3399)
  • Fixed SqlCachedBuffer async read edge case. (#3329)
  • Fixed SqlSequentialTextReader edge case with single-byte reads. (#3383)
  • Fixed an incorrect error message when parsing connection string PoolBlockingPeriod. (#3411)
  • Added missing ToString() override to SqlJson. (#3427)

Changed

Contributors

We thank the following public contributors. Their efforts toward this project
are very much appreciated.

New Contributors

Target Platform Support

  • .NET Framework 4.6.2+ (Windows ARM64, Windows x86, Windows x64)
  • .NET 8.0+ (Windows x86, Windows x64, Windows ARM64, Windows ARM, Linux, macOS)

Dependencies

.NET Standard 2.0

  • Azure.Identity 1.13.2
  • Microsoft.Bcl.Cryptography 9.0.4
  • Microsoft.Data.SqlClient.SNI.runtime 6.0.2
  • Microsoft.Extensions.Caching.Memory 9.0.4
  • Microsoft.IdentityModel.JsonWebTokens 7.7.1
  • Microsoft.IdentityModel.Protocols.OpenIdConnect 7.7.1
  • Microsoft.SqlServer.Server 1.0.0
  • System.Configuration.ConfigurationManager 9.0.4
  • System.Security.Cryptography.Pkcs 9.0.4
  • System.Text.Json 9.0.5

.NET Framework 4.6.2+

  • Azure.Identity 1.13.2
  • Microsoft.Bcl.Cryptography 8.0.0
  • Microsoft.Data.SqlClient.SNI 6.0.2
  • Microsoft.Extensions.Caching.Memory 8.0.1
  • Microsoft.IdentityModel.JsonWebTokens 7.7.1
  • Microsoft.IdentityModel.Protocols.OpenIdConnect 7.7.1
  • System.Buffers 4.5.1
  • System.Data.Common 4.3.0
  • System.Security.Cryptography.Pkcs 8.0.1
  • System.Text.Encodings.Web 8.0.0
  • System.Text.Json 8.0.5

.NET 8.0

  • Azure.Identity 1.13.2
  • Microsoft.Bcl.Cryptography 8.0.0
  • Microsoft.Data.SqlClient.SNI.runtime 6.0.2
  • Microsoft.Extensions.Caching.Memory 8.0.1
  • Microsoft.IdentityModel.JsonWebTokens 7.7.1
  • Microsoft.IdentityModel.Protocols.OpenIdConnect 7.7.1
  • Microsoft.SqlServer.Server 1.0.0
  • System.Configuration.ConfigurationManager 8.0.1
  • System.Security.Cryptography.Pkcs 8.0.1
  • System.Text.Json 8.0.5

.NET 9.0

  • Azure.Identity 1.13.2
  • Microsoft.Bcl.Cryptography 9.0.4
  • Microsoft.Data.SqlClient.SNI.runtime 6.0.2
  • Microsoft.Extensions.Caching.Memory 9.0.4
  • Microsoft.IdentityModel.JsonWebTokens 7.7.1
  • Microsoft.IdentityModel.Protocols.OpenIdConnect 7.7.1
  • Microsoft.SqlServer.Server 1.0.0
  • System.Configuration.ConfigurationManager 9.0.4
  • System.Security.Cryptography.Pkcs 9.0.4
  • System.Text.Json 9.0.5
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