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a. Construct a query around any one of the functional divisions you made in 4a such that if executed in the distributed design of 4 would require reconstruction of at least two horizontal and two vertical fragments, as well as a choice of one replica.
b. Using the centralised schema of 3, show an optimum query plan for your query.
c. Show two distributed query plans for your query. One assumes all data is transported to another site. The other plan achieves close to minimum data transport and use of at least one semijoin. Using the quantitative analysis of 2 and assumptions based on 3 and 4, estimate the cost of each plan in terms of bytes of data transmitted. Show your working.
d. Sketch a process to update the product catalogue. The process will have a coordinating transaction and subtransactions responsible for the product table, outlet table and the shopping cart. At least part of the product table will be replicated, so there will be a separate process for each replica. Use a synchronised replication protocol. The process will detail the messages sent from process to process and the read-item and write-item for each database access. Other aspects of the process can be briefly described in English.
Annotate the process with resource lock/unlock commands corresponding to a two-phase locking protocol. Justify your claim that the protocol is two-phase locking in your specific case.
Question 1 Describe the following- Clustering Indexing Question 2 Explain the following with suitable real time examples- Implementation of Integrity rules
Define functional and multivalued dependencies. Ans: A functional dependency is a assets of the semantics of the attributes in a relation. The semantics point out how at
Which is the properties of entities? Attributes is the properties of entities.
UNION If R1 and R2 are two union compatible relations then R3 = R1 ∪ R2 is the relation having tuples that are either in R1 or in R2 or in both. In case, R3 will have tuples
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WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
complete er diagram of textile industry management
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
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The External or View Level The external or view level is the highest level of abstraction of database. It gives a window on the conceptual view, which permits the user to see
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