Object groups may be better than pages

Argues against trying to solve the problem of clustering objects into disk pages. Instead, the author proposes that objects be fetched in groups that may be specific to an application or user, and that can be computed at fetch time. He briefly describes crystals, which serve to record such groups statically. Finally, I speculate that object fetching may be particularly relevant for providing services to very small machines with limited memory, such as personal digital assistants