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Describe the Association: Design
Before we describe association design let us define association "Association is set of links between two objects in the object model". It is helpful in finding paths among objects. It is a conceptual entity, which could be used for modeling and analysis. At final phase of advance object design, we must use strategy for applying association in object model. Association is also termed as "a collection of links between two objects having common structure and common semantic".
Saving Derived Attributes to Avoid Re-computation As discussed, "redundancy means duplication of exact data". But, if multiple copies of same data are present in the system,
Optimistic Concurrency Control Is locking the only way to stop concurrency related problems? There exist some other ways too. One such way is known as an Optimistic Concurrency
Lossless-Join Decomposition Let us show an intuitive decomposition of a relation. We require a better basis for deciding decompositions since intuition may not always be r
#ques Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a p
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
What is Normalization? Database normalization is a data design and organization method applied to data structures based on rules that help building relational databases. In rel
explain normalization,and give the examples 1NF,2NF,3NF,BCNF.AND FUNCTIONAL DEPANDENACY AND DECOMPOSITION TECHNIQUES.
#question.what is mapping constraints and types?.
What is the use of Union and intersection operation? Union: The result of this operation contains all tuples that are either in r1 or in r2 or in both r1 and r2.Duplicate tuple
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