How Extended Stored Procedures Work
Applies to: 
SQL Server
Important
This feature will be removed in a future version of SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Use CLR Integration instead.
The process by which an extended stored procedure works is:
When a client executes an extended stored procedure, the request is transmitted in tabular data stream (TDS) or Simple Object Access Protocol (SOAP) format from the client application to Microsoft SQL Server.
SQL Server searches for the DLL associated with the extended stored procedure, and loads the DLL if it is not already loaded.
SQL Server calls the requested extended stored procedure (implemented as a function inside the DLL).
The extended stored procedure passes result sets and return parameters back to the server by through the Extended Stored Procedure API.
Feedback
Coming soon: Throughout 2024 we will be phasing out GitHub Issues as the feedback mechanism for content and replacing it with a new feedback system. For more information see: https://aka.ms/ContentUserFeedback.
Submit and view feedback for