Database error

Hi,

On XI 7.0, when the ABAPER is trying to connect to the database, this is the error he is getting,

Error during database connection to the database URL 'jdbc:oracle:thin:@viwsdv25:1521:ORCL'

using the JDBC driver 'oracle.jdbc.driver.OracleDriver': 'com.sap.aii.adapter.jdbc.sql.DriverManagerException:

Cannot establish connection to URL 'jdbc:oracle:thin:@viwsdv25:1521:ORCL':

SAPClassNotFoundException: oracle.jdbc.driver.OracleDriver'

Can anybody suggest a solution?

I have the document that helps with installation of external drivers, but how do i know what drivers to install, and where do i find them? i.e if i have to install any drivers.

Thanks,

vishnu