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Explain the Functional Mode with help of an example.
Functional Model
The functional model shows a computation and functional derivation of data values in it without indicating how, why or when values are compounded. For illustration a spreadsheet is type of functional model. The values in a spreadsheet could be calculated by using some formula, but it cannot be structured further.
Define shadow paging. An alternative to log-based crash recovery method is shadow paging. This technique requires fewer disk accesses than do the log-based methods.
aggregation
Consider the relations City (city_name, state) Hotel (name, address) City_hotel (hotel_name, city_name, owner) Answer the following queries in relational algebra (i) Find
Objectives Define the terms RECOVERY and INTEGRITY; Define Recovery Techniques; Explain Error and Error detection techniques, and Define types of Authorisation.
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
What is meant by functional dependencies? Consider a relation schema R and α C R and β C R. The functional dependency α ->β holds on relational schema R if in any legal relati
What is called a query evaluation plan? A sequence of primitive operations that can be used to assess a query is a query evaluation plan or a query implementation plan.
Determine the advantage of object-orientation Finally, object-orientation has advantage of continuity throughout analysis, persistent representation and design implementation.
What are the storage types? The storage types are: a) Volatile storage b) Nonvolatile storage
What is an entity relationship model? The entity relationship model is a set of basic objects known as entities and relationship between those objects. An entity is a thing or
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