How to Delete Usage Logs on Sharepointby Tara Cantore
Microsoft Sharepoint records its usage logs in diagnostic files. Each of these logs can be maintained and used through the Windows graphical user interface. Deleting a log erases its records permanently from your hard drive, but in turn frees disk space that can be used for other purposes.
Open your Start menu and type "Sharepoint" in the search programs and files box.
Click "SharePoint Portal Server Central Administration" and press "Enter."
Click "Server_Name" where "Server_Name" is the name of your server, then click "Configure diagnostic settings."
Click "View Diagnostic Logs," then select the log you'd like to modify.
Click "Delete" on the toolbar, then click "Yes." Your log is now deleted,.