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Object Oriented model:An object has values stored in instance variables within the object. An object also has bodies of code that execute on the object. These bodies of code are named methods. Objects that have same kinds of values and the same functions are grouped together into classes. The object-oriented paradigm gives the programmer to address the complexity of a problem domain by obtaining the problem not as a set of methods that can be operated but primarily as a set of interacting, related Objects. The modeling task then is specifying, for a specific context, those Objects, their respective group of Methods and Properties, shared by all Objects group members of the Class.
Whst is logical schema ? Logical schema is the entire database.
What is transaction? Transaction is a unit of program implementation that accesses and possibly updated several data items.
aggregation
The Database Approach In order to overcome the limits of a file system, a new approach was needed. Hence a database approach emerged. A database is a persistent collection of
why are older data models are being replaced by new data models
Example: Consider the following relations: ROLLNO NAME ADDRESS COURSE_ID 100 Ka
Write short notes on data ware housing? Data ware housing applications needs the transformation of data from many sources into a cohesive reliable step set of data configured a
notes about update opreation
Control as a State Machine Engine First let us define the state machine: "the state machine is a machine which is an object but not an application object. It is a part of lang
Give an example of operations from the State Actions and Activities. For instance, in bank the activity verify account code and verify password
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