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Preview Documents

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This section provides descriptions for and links to the technical documents in the Windows Protocols documentation set that are currently released as preview PDF versions. These documents are in the process of being created or updated for either new product versions or significant product updates.

Microsoft may publish technical documents as preview (also called pre-release or preliminary) versions for community review and feedback. Not every technical document is published for preview, and each document’s preview period may vary. After the preview period is completed, each document is published to its appropriate released-version ___location at Windows Protocols Technical Documents.

To provide feedback or ask questions about a preview version of a technical document, you can use the Open Specifications forums.

Updated Documentation in Preview

The following document, provided in PDF format, contains revision marks that show changes due to supporting product updates. Also shown may be document revisions made since this documents was last released. Preview documents show content additions in green-highlighted underlined text and deletions in red-highlighted strikethrough text.

Specification

Description

Release date

[MS-TDS]: Tabular Data Stream Protocol | Microsoft Learn

Specifies the Tabular Data Stream Protocol, which is an application layer request/response protocol that facilitates interaction with a database server and provides for authentication and channel encryption negotiation; specification of requests in SQL (including Bulk Insert); invocation of a stored procedure, also known as a Remote Procedure Call (RPC); returning of data; and Transaction Manager Requests.

This document has been updated as follows:

  • Introduction of a new vector data type in SQL Server and Azure SQL Database, optimized for operations such as similarity search and machine learning applications. The new vector data type is represented by a new TDS type_id of 245 (0xF5), along with a feature extension for login negotiation and specific byte layout changes to support vector data operations.

May 30, 2025