Equivalent data types in Oracle database for SQL Server 2008’s uniqueidentifier and timestamp

I am working on SQL Server 2008 R2, and I have data types which is specific for SQL Server, including:

• UniqueIdentifier


• Timestamp

Now I want to deploy my asp.net mvc 5 web application on an Oracle database instead of SQL Server. But which data types in Oracle are equivalent to the above SQL Server data types?

Thanks