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Explain Instance and schemas? Instances and schemas: Databases changes over time as the information is deleted and inserted. The collection of information stored in database
An instance of relational schema R (A, B, C) has distinct values of A including NULL values. then A is a candidate key or not? If relational schema R (A, B, C) has distinct val
Distributed Database Management System
Consider a systems development project with the following data Activity Duration (weeks) Precedence Relationship 1. Software design
A software contract and consultancy firm maintains details of all the various projects in which its employees are currently involved. These details comprise: Employee Numbe
What is a function group? A function group is a collection of logically related modules that share global data with every other. All the modules in the group are contained in
State as Location within a Program In this traditional approach, location of control inside a program totally defines the program state. Any finite state machine may be implem
how many hourse have been spent on a certain project
lock and types of lock
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
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