Answer by Pavel Pawlowski

- List item +1 to @Oleg. I only add, that there are issues with x64 machines. I mean, you need to do the installation of the Oracle Drivers in appropriate way to be able to access oracle from x64 version of SQL Server as well as from x32 tools like BIDS (SSDT). This steps are for the 11g client installation (you can access earlier versions of oracle as well using the 11g client). You need to install first x32 version of Oracle Drivers followed by x64 version of drivers. During installation you have to ensure, you are installing: - Oracle Call Interface - Oracle Net Client - Oracle Provider for OLE DB After installation some adjustments in registry are necessary. Under registry Keys HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSDTC\MTxOCI HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\MSDTC\MTxOCI  You have to change Values of entries: OracleOciLib = oci.dll  OracleSqlLib = orasql11.dll OracleXaLib = oraclient11.dll After Rebot and following @Oleg answer you should be able to create the Linked Server and use it. You will probably be able to create it even without following @Oleg's answer, but in that case you will be able to query the Linked Server, but you will be unable to browse the linked server views, tables etc. in SSMS.