SQL Database Vector Search Sample

A repository that showcases the native VECTOR type in Azure SQL Database to perform embeddings and RAG with Azure OpenAI.

The application is a Minimal API that exposes endpoints to load documents, generate embeddings and save them into the database as Vectors, and perform searches using Vector Search and RAG. Currently, only PDF files are supported. Vectors are saved and retrieved with Entity Framework Core using the EFCore.SqlServer.VectorSearch library. Embedding and Chat Completion are integrated with Semantic Kernel.

Note

If you prefer to use straight SQL, check out the sql branch.

Setup

• Create an Azure SQL Database on a server that has the Vector Support feature enabled
• Execute the Scripts.sql file to create the tables needed by the application
  • You may need to update the size of the VECTOR column to match the size of the embedding model. Currently, the maximum allowed value is 1998.
• Open the appsettings.json file and set the connection string to the database and the other settings required by Azure OpenAI
  • If your embedding model supports shortening, like text-embedding-3-small and text-embedding-3-large, and you want to use this feature, you need to set the Dimensions property to match the value you have used in the SQL script. If your model doesn't provide this feature, or do you want to use the default size, just leave the Dimensions property to NULL. Keep in mind that text-embedding-3-small has a dimension of 1536, while text-embedding-3-large uses vectors with 3072 elements, so with this latter model it is mandatory to specify a value (that, as said, must be less or equal to 1998).
• Run the application and start importing your PDF documents.