Database driver

Dear Gurus,

I have to install oracle gateway 11g on solaris 10.5 , can any body let me know what is the path for ODBC.ini file in solaris and does solaris provide any generic database driver for all the database or i need to download the odbc driver for particular database.

I have to connect to sqlserver from ODBC, where can i find the available sqlserver driver if it is available.

Please help