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Write short note on Events
Events consist of inputs, interrupts, decisions and actions performed by any external device or users. Every event always has a sender and receiver. In most of cases sender and receives are same object. A state with no a predecessor and successor are ambiguous and care would be taken to represent initiations and termination of the events. Events that have same effect on control flow must be grouped together even if value differs. The events are to be allocated to object classes that send or receive it.
Most of design issues of systems are concerned with steady-state behaviour of system.
However, system design phase must also address the initiation and finalization of system. This is addressed by a set of new uses cases known as administration use cases
Where does view definition stored? A view definition is permanently stored as part of the database.
Q. Explain data aggregatio n and discuss different design constraints. Sol. Aggregation One limitation of the E-R model is that it cannot express relationships amon
Show, with the help of an example, that relatively high-level transitions result when system or program is stimulated by the outside events. In diagram below, we can observe i
1. Define each of the following IN YOUR OWN WORDS: (a) File: (b) Record: (c) Field: (d) Primary Key: (e) Secondary Key: 2. A travel agency wants t
Explain the Role of a database administrator a. Defining the Schema The DBA describes the schema which consists of the structure of the data in the application. The DBA
What are the uses of functional dependencies? To test relations to see whether they are legal under a given set of functional dependencies. To state constraints on the set
comparison of oracle RDBMS with MySQL
Define the Immediate Update The immediate update methods may apply changes to the database on disk before the transaction arrives a successful conclusion. Though, these change
The users who use easy-to-use menu are called ? The users who use easy to use menu are called as Naïve users.
List some instances of collection types? a) sets b) arrays c) multisets
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