You need to install the EI Adapters. The logger adapter is an adapter configurable via the normal adapter config tool. You can use Oracle/ SQL Server as database for this.
Installation instructions you can find in the EI user guide - Chapter 6 is memory serves me correctly.
The IM must then connect to the database used for logging - all of which is explained in the EI user guide (some of it is a bit vague though).
Hope this helps.
Regards
Willem van der Merwe
#Integration-Server-and-ESB#webMethods#webMethods-General