This work was supported in part by PENED project ``Exploitation of idle memory in a workstation cluster'' (2041 2270/1-2-95), and in part by the USENIX Association through project ``Network RAMDISK''. We deeply appreciate this financial support. Mike Feeley provided us the code for OO7, and DEC SRC provided us the SQL traces. Manolis Katevenis, Dionisis Pnevmatikatos and Catherine Chronaki provided useful feedback during earlier stages of this work. We thank them all.