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Concurrency Identification
While designing analysis, model we map real world model into our analytical model. Real life objects are simultaneous in nature, but all the design model objects are not concurrent in nature, as single process may support multiple objects.
What are the various states through which a transaction passes through in its lifetime? Briefly discuss all the events that causes transition from one state to another. Ans:
I am doing research in this area, especially in sime join and join efficacy when several relations have been queried. Relations located in different sites. I need something like n
The data of a view is not physically stored, but derived from one or more tables. True the data of a view is not physically stored
what do you understand by enhanced entity-relationship
Why a report generator is used ? Report generator is used for print files on paper.
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
Data Independence This brings us to our next topic: data independence. It is the property of the database which tries to make sure that if we make any change in any level of sc
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
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