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Explain what is Aggregation?
Aggregation: Aggregation is an significant concept in database design whereas composite objects could be modelled during the design of database applications. Thus, preserving the aggregation concept within database implementation is must. we propose models for implementation of aggregation in an Object-Relational Database Management System (ORDBMS) through the use of index clusters and nested tables. Aggregation refers to an abstraction in that a relationship among objects is regarded as a higher-level object.
Consider a research paper submission process. The process starts when an author submits a draft research paper (the paper may have up to 3 authors) to the chair of the organizing c
Using your cache simulator and using smalltex.din as your memory trace determine the total miss rate, compulsory miss rate, capacity miss rate, and conflict miss rate for the follo
Consider the relations City (city_name, state) Hotel (name, address) City_hotel (hotel_name, city_name, owner) Answer the following queries in relational algebra (i) Find
The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
Discuss the importance and characteristics of database backup and recovery procedures, then describe the actions that must be detailed in backup and recovery plan
Explain Superkey Ans: A superkey is described in the relational model of database organization like a set of attributes of a relation variable for which it holds that in all re
explain the steps for reduction of er model into relational model?
Backward Recovery (UNDO): In this system the uncommitted changes made by a transaction to a database are undone. Instead the system is reset to the last consistent state of databa
Isolation or Independence : The isolation property shows that the updates of a transaction should not be visible till they are committed. Isolation assurance that the progresses of
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
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