[Koha] Problem querying for OCLC

A number of the reports we use currently require us to pull a list of the bibs that either have or don't have an OCLC number and were added during the past week. While trying to create the same report in Koha, it appears I can't run a query that large against either biblioitems.marc or biblioitems.marcxml--the only two places that appear to have the OCLC number. The report times out, even if I limit it to a single day. Does anyone have a suggestion as to how I might be able to get the report working? Thanks! Cindy -- Cindy Weber cweber@scls.lib.wi.us System Support Specialist (608)242-4710 South Central Library System