> For the complete documentation index, see [llms.txt](https://docs.rmhpos.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rmhpos.com/installation/install-microsoft-sql-server/sql_topics/sql-introduction.md).

# Introduction

This guide provides answers to frequently asked questions about the relationship between the Retail Management Hero (RMH) apps and Microsoft SQL Server.

The RMH apps use SQL Server for data storage. SQL Server Express, a free edition of SQL Server, is usually sufficient for single-store implementations. Stores will normally upgrade to a paid edition of SQL Server, such as Standard, when they reach the database size or resource usage limits for SQL Server Express.

This guide provides general information about SQL Server and how the RMH apps use SQL Server. It does not explain how to install, license, configure, or maintain SQL Server. You should always follow Microsoft guidelines and instructions for SQL Server.


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