I'm assuming you want to move to Enterprise Library 3.1.
There is no equivalent. The Configuration Application Block was removed from Enterprise Library. This functionality was replaced with .NET Framework configuration classes. If you are using this functionality you would have to do coding
to use the new classes (or perhaps replicate the old functionality -- although this is not the recommended approach).
Log sinks were replaced with trace listeners. The Logging Database functionality is located in Microsoft.Practices.EnterpriseLibrary.Logging.Database.dll.
The RollingFlatFileSink is replaced with RollingFlatFileTraceListener located in Microsoft.Practices.EnterpriseLibrary.Logging.dll.
I don't see a DB2 database implementation for Enterprise Library 3.1. You can use the OLEDB Provider. Enterprise Library Contrib has a
DB2 Provider but it is for Enterprise Library 4.1.
Enterprise Library support engineer