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!
Distributed query and transaction processing
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 twophase locking protocol. Justify your claim that the protocol is two-phase locking in your specific case.
Describe logical data independence ? Logical Data Independence - It is the capacity to modify the conceptual schema without having to change external schemas or application p
What is the difference between internal tables and extract datasets? The lines of an internal table always have the similar structure. By using extract datasets, you can ha
Write the motivations led to development of OO-DBMS? 1. Programmer frustration with RDBMSs. 2. Requirement for special features.
Advantages of Data Distribution The primary benefit of distributed database systems is the ability to access and share data in a reliable and efficient manner.
Define Deadlock detection If a system does not employ a few protocols that make sure deadlock freedom, after that a detection and recovery scheme should be used. An algorithm
Differance between internal and external schema? Internal and external schema: Internal Schema • Describes the physical storage structure • Uses a physical data model External
What is Collation Collation is a kind of sort order. There are majorly 3 types of sort orders, namely: i.) Dictionary case insensitive ii.)Dictionary - case sensitive
Explain Dynamic Two-Phase Locking Here a transaction locks a data item instantly earlier than any operation is applied on the data item. After finishing all the operations on
Explain the two types of participation constraint. 1. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
is Chipo carrying his baby
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