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 Design
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59
Table 5.1 Comparison of Strategies for Data Allocation
Locality of
reference
Reliability
and
availability
Workload
distribution and
performance
Storage
costs
Communication
costs
Centralized Lowest Lowest Poor Lowest Highest
Fragmented High Low for data
item, high
for system
Satisfactory Lowest Low
Complete
replication
Highest Highest Best for reading Highest High for updating
low for reading
Selective
replication
High Low for data
item, high
for system
Satisfactory Average Low
5.3 Data Fragmentation
In a distributed system, a global relation may be divided into several non-overlapping subrela-
tions and allocated to differ
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