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Describe Physical Data independence ?
Physical Data Independence - It is capacity to modify the internal schema without having to change conceptual schema. Therefore, the external schemas required not be changed as well. Changes to the internal schema might be required because some physical files had to be reorganized to improve the performance of retrieval or update. If the similar data as before remains in the database, the conceptual schema requires not be changed.
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.
What are composite attributes? Composite attributes can be separated in to sub parts.
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
The definition of the classes and operation can often be adjusted to increase the amount of inheritance". Justify the above statement. Adjustment of Inheritance The def
What is system catalog or catalog relation? How is better known as? A RDBMS maintains a explanation of all the data that it contains, information about every relation and index
What are the Constituents of File? Also elaborates all the possible file operations? A file is organised logically as sequence of record. These records are mapped onto disk blo
define attribute inheritance with example?
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
employee(empid,empname,dept,telno,mobno, add,sssno,tinno,WEdates,WEcomp,WEadd,WEpos,WEres) this is a employee record which is need to be normalize.the WE means work experience
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