Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--
Forward Recovery (Redo): In this system the committed changes made by a transaction are reapplied to a previous copy of the database. In simpler
Package classes and associations into models Programs are made of separate physical units which could be edited, imported, complied or otherwise manipulated. The careful part
Why is database redesign necessary? Database redesign is essential for two reasons. First, redesign is essential both to fix mistakes made during the initial database design. S
Describe entity referential integrity and integrity. Give an example of each. Entity Integrity Rule - If there is a attribute A of relation R is a prime attribute of R then A
Explain the Static or conservative Two Phase Locking: Static (or conservative) Two Phase Locking: In this type of scheme, all the data items are locked earlier than any opera
Key to represent relationship amongs tables is called ? A Key that represent the relationship between tables is called Foreign Key.
Question A What is operational intelligence? Question B What is Business Intelligence? Explain the components of BI architecture Question C Differentiate between databas
We want have a website; we need to test the security of our website. You need to: -Try to bypass our security by simulate a website hacking -Try some hack Techniques like
What are the two integrity rules? Ans: The two integrity rules are: Entity Integrity Rule & Referential Integrity Rule. Entity Integrity Rule - If the attribute A of rel
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd