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Write short notes on Schema diagram.
A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appears as a box with attributes listed inside it and the relation name above it.
what is query processing ,query optimization and performance turring?
Determine the Derived attribute to avoid re-computation Each class box consists of an ordered list of attributes and operations, each represented as a next string. We can find
What is meant by the degree of relationship set? The degree of relationship type is the number of participating entity types.
What is a recursive relationship? Give an example not used in the text. A recursive relationship is a relationship among an entity and itself. For example, given the entity PER
What is a Built-in A notation of identity is built-into the data model or programming language and no user-supplied identifier is needed. This form of identity is used in objec
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
discuss the purpose of the concurrency control?
What is average response time? The average response time is that the average time for a transaction to be done after it has been submitted.
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
Which database level is closest to the users? External database level is closest to the users.
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