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What is object identity?
An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
Explain the components of Database System in details.
What is a view? A view is a logical view on one or more tables. A view on one or more tables i.e., the data from a view is not actually physically kept instead being derived f
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
What is Relational calculus? Relational calculus is a Non- Procedural language.
Explain current page table and shadow page table. The key idea behind the shadow paging method is to maintain two page tables during the life of the transaction: the current pa
Consider the relations: PROJECT(proj#,proj_name,chief_architect) EMPLOYEE(emp#,emp_name) ASSIGNED(proj#,emp#) Use relational algebra to express the subsequent queries: (i) Get
why are older data models are being replaced by new data models
(a) Why did SAP introduce the extended star schema?
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
Which are the two ways in which entities can participate in a relationship? Total and partial are the two ways in which entities can participate in a relationship
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