May 2024
Intermediate to advanced
325 pages
12h 2m
English
Content preview from Distributed Database Systems, 1st Edition by Chhanda Ray
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Distributed Database Systems
This protocol is an extension of the distributed 2PL method, and hence it avoids the bottlenecks
of centralized 2PL method. The main disadvantage of this protocol is that it is more complicated
and hence the deadlock handling also is more complex. In this method, locking a data item that
has m copies requires at least (m ⫹ 1)/2 messages for lock requests and (m ⫹ 1)/2 messages for
unlock requests; thus, communication cost is higher than that of centralized 2PL and primary copy
2PL methods.
8.5.5 Biased Protocol
The biased protocol is another replica control approach. This approach assigns more preference to ...
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