So, ever played to much with a CLM test or demo environment and the database is full of old requests?
You can clean
the database by running the ILM configuration wizard.
The wizard wil drop (and recreate) the database as part of the final configuration.
If you want the certificates from your current installation, don't let the wizard create new service account certificates.
There is a checkbox for this option.
I've done this for CLM 2007 (FP1) but I did not test it for newer releases (so i give no warranties).