MDAC（Microsoft Data Access Components）是微软数据库访问组件，Netpise和许多利用数据库的软件都需要操作系统安装MDAC。很多用户的操作系统中已经存在了MDAC，有些是操作系统内置的、有些是其它应用程序安装的。-MDAC (Microsoft Data Access Components) is a Microsoft database access components, Netpise and many need to use the database software operating system to install MDAC. Many users of the operating system already exists in the MDAC, some built-in operating system, some other applications installed.