ata Sharing ecovery in Gigabit-Networked Databases

M a j o r advances in opt ical f iber t r a n s m i s s i o n and swi tch ing technology h a v e enabled t h e deve lopment of v e r y h i g h speed n e t w o r k s with d a t a ra tes of t h e order of gigabi ts p e r second. It i s ant ic ipated t h a t in th'e f u t u r e , w i d e area gigabi t n e t w o r k s wi l l in terconnect database s e r v e r s around t h e globe creat ing ex tremely power fu l dis tr ibuted i n f o r m a t i o n s y s t e m s . In this paper, w e exa m i n e t h e i m p l i c a t i o n s of s u c h a h i g h speed n e t w o r k on d a t a access a n d shar ing techniques and propose a lock-based concurrency control protocol and a logbased recovery protocol t h a t ensures d a t a cons is tency an gigabit-networked databases . B o t h protocols exploi t t h e charac ter i s t ics of a gigabi t network: t o enhance t h e p e r f o r m a n c e of t h e database s y s t e m a n d , in par t icu lar , t h e f a c t t h a t t h e s i ze of t h e m e s s a g e i s less of a conc e r n t h a n t h e n u m b e r of sequent ial p h a s e s of m e s s a g e passing.