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Transcript
Distributed Lock Manager ï® In this approach, functionality of locking is implemented by lock managers at each site ïª Lock managers control access to local data items ï But special protocols may be used for replicas ï® Advantage: work is distributed and can be made robust to failures ï® Disadvantage: deadlock detection is more complicated ïª Lock managers cooperate for deadlock detection ï® Several variants of this approach ïª Primary copy ïª Majority protocol ïª Biased protocol ïª Quorum consensus 19.5 ©Silberschatz, Korth and Sudarshan Database system ,CSE-313, P.B. Dr. M. A. Kashem Asst. Professor. CSE, DUET, Gazipur. Database System Concepts
