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Assigning Responsibility for Operation
Many operations might have obvious target objects, but some of these operations could be used at numerous places in an algorithm, by one of many objects. These operations are complex high level operations which can be overlooked in laying out the object classes as they are not an inherent part of any of the class.
Now, obvious question is, how do you know what class owns an operation? It is easy when only one of the objects is involved in operation: You are simply informing the object to perform an operation. But when more than one of the objects is involved in an operation it becomes quite hard. Therefore, we must know which object plays main role in operation. For this, ask yourself following questions:
er diagram on cosmetics.
The JOIN operation is applied on two relations. When we want to choose related tuples from two given relation join is used. The join operation need that both the joined relations m
Define average latency time. The average latency time of the disk is one-half the time for a full rotation of the disk.
Define Cascading rollback The phenomenon where a single transaction failure leads to a series of transaction rollbacks is known as Cascading rollback.
Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.
You group has been hired by TrainingrUs.com to keeps track of training revenues. TrainingrUS.com wants you to keep scheduling. COURSE table contains following information:
How can one distinguish among different kinds of parameters? Input parameters are used to pass data to subroutines. Output parameters are used to pass data from subrout
In E-R Diagram how relationship type is represented ? In E-R Diagram relationship type is represented as a Diamond.
A super key is an attribute or set of attributes used to recognize the records uniquely in a relation. For instance, in the Relation PERSON defines earlier PERSON_ID is a super
a publishing company produce scientific books on various subjects. the books are written by authors who specialize in one particular subject. the company employs editors who, not n
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