As I've mentioned, I get many article ideas from questions that people ask me directly or that come up on the public newsgroups. When the same question comes from several directions at once, I start thinking that maybe it's time to write about that question. My idea for this month's column started when a student in my class asked me a question after I described the structure of nonclustered and clustered indexes. As I mentioned in my November 2004 column, "Get Into Index Structures" (InstantDoc ...