data replicationif a relation r has its copies
Data Replication
"If a relation R has its copies kept at two or more sites, then it is considered replicated".
But why do we replicate a relation?
There are several advantages and drawbacks of replication of relation
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design of distributed databases the distributed databases are mainly relational at local level so a local database schema is the similar as that of a
replication it is definite as a copy of a relation every replica is stored at a dissimilar site the alternative to replication is to store only
write a fully modular c program that reads in a string of a defined size from the keyboard and reports how many times each letter of the alphabet
fragmentation it is definite as partitioning of a relation into various fragmentsevery fragment can be stored at a dissimilar
data replicationif a relation r has its copies kept at two or more sites then it is considered replicatedbut why do we replicate a relationthere are
availability a site having the copy of a replicated relation fails even then the relation may be found in another site therefore the system may carry
increased parallelism since the replicated date has several copies a query can be distributed or can be answered from the smallest loaded site also
increased overheads on update on the drawbacks side it will need the system to ensure that all replicas of a relation are consistent this shows that
complete replication it implies maintaining of a whole copy of the database at every site thus the reliability amp availability and performance for
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