Here's a quick JDBC with HSQLDB tutorial to get you up and running with Java database connectivity and the popular HyperSQL database.

Jack Wallen shows you how easy it is to create a MongoDB database and collection using the Compass GUI.

To create a knowledge base, we will need ways to import multiple kinds of documents into the vector database. For this we can use loaders and parsers from libraries such as LangChain or LlamaIndex.