SQL Server Data Access Components (SDAC) is a library of components that provides access to the Microsoft SQL Server databases. SDAC connects to SQL Server directly through OLE DB, which is a native SQL Server interface. The SDAC library is designed to help programmers develop faster and cleaner SQL Server database applications. SDAC is a complete replacement for standard SQL Server connectivity solutions and presents an efficient alternative to the Borland Database Engine for access to SQL Server.
In most cases the only OLE DB is reqired to be installed on the workstation. In the current versions of Microsoft Windows, as Windows 2000, OLE DB is already included as a standard package. But it is highly recommended to download the latest version (newer than 2.5) of Microsoft Data Access Components (MDAC) that include OLE DB.
Compiled versions of SDAC are installed automatically by the SDAC Installer for all supported IDEs. Versions of SDAC with Source Code must be installed manually. For more information, see the Installation topic of the SDAC Help documentation.
It is important to know that ODAC, SDAC, MyDAC, and IBDAC components use the common base packages, so product compatibility is provided for the current build only. In the other words, if you upgrade one of the installed products, it may conflict with older builds of other products. In order to continue using the products simultaneously, you should upgrade all of them at the same time.