Parallel database systems keep duplicates of each data item (or division) on several nodes. a. Why is it preferable to spread copies of data items assigned to a node among many other nodes rather than keeping all copies in the same node? (or set of nodes). b. What are the advantages and disadvantages of utilizing RAID storage rather than keeping an additional duplicate of each data item?

Parallel database systems keep duplicates of each data item (or division) on several nodes. a. Why is it preferable to spread copies of data items assigned to a node among many other nodes rather than keeping all copies in the same node? (or set of nodes). b. What are the advantages and disadvantages of utilizing RAID storage rather than keeping an additional duplicate of each data item?

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter12: Secondary Storage Management

Section: Chapter Questions

Problem 6RQ

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Parallel database systems maintain copies of each data item (or division) on many nodes, which is known as redundancy.If copies of data items allocated to a node are distributed throughout many other nodes rather than maintaining all copies in the same node, explain why this is the preferred method. (or a collection of nodes)The benefits and cons of using RAID storage as opposed to storing an extra copy of each data item is discussed in detail in Section B. b.
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please answer the full question correctly otherwise i will give you dislike ................ When is it useful to have replication or fragmentation of data in distributed database systems? Is it possible to combine replication and fragmentation? How is vertical fragmentation different from horizontal fragmentation? Explain with the help of an example.
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