If you are a member of the Apple Developer Connection Select, you have access to some of the "foundational videos" from previous WWDCs. Among them is the WWDC 2006 โBasic Data in a Nutshellโ session, which was given by Apple to introduce Core Data on the Mac for the first time, and is a great start-up video on the subject. Also there is a session of WWDC 2007 "Optimization of your main application for data processing."
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