I suggest another solution if you are interrested. If you want import iis log files to sql server database - ok, but when you must import for example 1 GB log files per day I suggest Log Parser 2.0. It's Microsoft tool and the most important thing it's free (I was reading license 6 months ago). You can analyze iis files using sql commands and export aggregates to sql server database via DSN. It's very fast !!, flexible and in my opinion great tool. But of course - your choice.

Best regards,

Gregory