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Describe about Use Case and external case in DFD
The processes are transformed those into the Use Case and external case in DFD has same characteristics which of an actor in OOAD.
The data store is transformed into class and part of data store to attributes of class.
Define a relation ? Relation - A relations is a named two-dimensional table of data. Mathematically, a relation can be described as a subset of the cartesian product of a lis
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
brief history,definition,current trends and future trends if any of data fragmentation
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
Type of views : Simple views and Difficult Views Feature Simple Views Complex Views Number of tables One
Timestamps For Read operations: If TS (T) If TS (T) >= W-timestamp (Q), then the transaction T is trying to read a value of data item Q which has been written and committed
what is 3nf
What are the Requirements of algorithm designer Algorithm designer should: i) Select proper algorithm so as to minimize implementation cost ii) Find most appropriate d
What is the error handling Traditionally, bits have been sent over line lacking any error correcting scheme in physical layer. The presence of the CPU in each modem makes it po
How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul
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