Native Connectivity to Microsoft SQL Server
Effective in version 9.6.0, you must install the Microsoft SQL Server 2012 Native Client to configure native connectivity to Microsoft SQL Server databases from Windows machines.
Previously, you did not have to install an SQL client because Informatica used the Microsoft OLE DB provider for native connectivity.
If you upgrade from an earlier version, you must install the Microsoft SQL Server 2012 Native Client. Install the client so that the Metadata Manager Service can connect to Microsoft SQL Server databases.