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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.
find the name of supplier who supply some red part
Give an example of Operations from the functions of a bank. For creation of a saving account, you can write: bank::: create -savings-account (customer)->account. For oper
The Structured Query Language INTRODUCTION Database is an organised set of information about an entity having controlled redundancy and serves numerous applications. DBMS
Normalize the following table upto and including the 3NF. Submit a 1 page printout of only the final set of normalized tables in Data Architect. Just use Data Architect to do the t
Why a report generator is used ? Report generator is used for print files on paper.
Surgeons identified by doctor ID (DOCID) operate on patients identified by patient ID (PATID) in operating theaters identified by room numbers (ROOMNO). Each surgeon can operate on
Which is the properties of entities? Attributes is the properties of entities.
difference between internal schema and external schema in DBMS
Why is database design important?
What do you understand by transitive dependencies? Define with an example any two problems that can take place in the database if transitive dependencies are available in the datab
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