# Using DB in ProudNet The ProudNet DB system is a full-featured database engine for online game development, designed to meet the requirements of the most common types of game databases and compatible with **Microsoft SQL Server** and **MySQL**. The ProudNet DB system collects database designs, data access types, required performance levels, and key techniques from typical online game development projects and organizes them into 'most common design types', which are then implemented in the ProudNet engine layer to build reliable game databases at high speed.\ \ However, because it requires the use of a database schema that has already been customized, migration work is inevitable if the ProudNet DB system is to be introduced in a development project that has already completed database design and implementation. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.proudnet.com/proudnet.eng/proudnet/db_system.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.