Answer Posted / mahesh (ezeesoft)
If you change internal low level abstraction database then they dont affect on higl level abstraction.
There are two types of data independance:
1) Physical data independance:
If you change physical level of data then they dont affect on logical level.
2) Logical data independance:
If you change logical level of data then they dont affect on view level
Summary: The ability to modify the schema defination in one level should not affect the schema defination in next higher level.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
What is the difference between 3 tier and 3 layer architecture?
Name the buffer in which all the commands that are typed in are stored
What is degree of Relationship type?
What is a Relation Schema and a Relation?
What is database architecture? : sql server architect
What do you mean by Correlated subquery?
What is n tier architecture with example?
What does n tier mean?
How one call ddl statement using stored procedures in oracle?
What is single tier architecture?
What are external procedures ? Why and when they are used?
What is Data Independence?
What is Relational Algebra?
Illustrate physical database architecture in brief? : sql server architect
What is Query evaluation engine?
