After comsidering the feedback I got from the previous 'Massive scalability' thread, I decided to split my queries into two areas: Rack scalability and ZCatalog scalability. This email deals with the latter. Partial match (wildcard) searches have already been identified as a resource hog, depending on the size of the result list. I am more than willing to give up wildcards in my application for performance. What I am interested in for my application are two things: - ZTopics populated using one or more keyword indexes - Full text search on a single computed attribute that concatenates several fields including the aforementioned keyword index fields and a few simple string attributes (title, caption, description, etc.) I need to know how far the ZCatalog will scale using this indexing and search strategy. Does anyone have anectodal or benchmark data to suggest if (and when) I will hit a 'wall' regarding the number of objects being indexed and searched? Some anectodal data suggests that single field indexing will scale easily to 60,000 objects, what about hundreds of thousands or even millions of objects? Also, is there a way to disable wildcards in full text searches? Thanks, Michael Bernstein.