In this master work has been passed in review theory material of database and database management system. In addition, has been analysed the main parts of information system of business companies. Microsoft Office Access 2003 is the database management program that gives an improved user experience and an expanded ability to import, export, and work with XML data files. Working in Access 2003 is easier because common errors are identified and flagged for you with options to correct them. Additionally, a new feature to Access 2003 also helps database developers view information on dependencies between database objects. Therefore, Microsoft Office Access 2003 was used to created database management system of company, which sells products of food. In addition, has been explored how influence relations between tables, number of records, number of fields and length of text fields on the rate. Business management system is the main part of comapany information system. Microsoft Office Access 2003 could use small companies, which have no more than 20 computers. This program has some advantages, because it isn‘t cost a lot and everyone could install it without any problem. Examinations show that relations between tables and length of text fields don‘t influnce on the rate. But the rate depends on the number of records and the number of fields.