The data is information on impressions of some internet banner ads. Without going into too much detail, included in the data are the user's ID, ad ID, time, website, and some other identifiers. I am dealing with billions of impressions and thus billions of observations - hence the long sort time. I use the tagsort option and am sorting my data on user ID and time so that I can then "roll up" my data by user ID. Having an admin delete the LCK and/or copying the dataset to a new name would not be an issue - I just don't really have the time to restart the entire sort process. Ideally there would be some way to resume the sort from where it left off using the LCK file but it seems that this is not possible.
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