(n) Spelled drilldown. The act of focusing in. For example, "He got the information he needed through a drilldown of the database."

Building an Internet Database Drilldown Application
An article from 4guysfromrolla.com.

Datamation
Datamation's Data Mining and Business Intelligence section contains current and archived articles and columns about data mining.

Drilling Down With A Data Mining Pioneer
Dr. Usama Fayyad, CEO and co-founder of DigiMine, has worked on data mining technology since 1989. Here he shares his thoughts about how to get the most out of your data.