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Importance Of File Organisation In Database
To execute a database efficiently, there are various design tradeoffs needed. One of the most vital ones is the file Organisation. For instance, if there were to be an application that need only sequential batch processing, then the use of indexing methods would be pointless and wasteful.
There are various important consequences of an inappropriate file Organisation being used in a database. Therefore using replication would be wasteful of space besides posing the trouble of inconsistency in the data. The wrong file Organisation can also-
Needless to say, these could have a lot of undesirable consequences at the user level, such as making some applications impractical.
Increased overheads on update : On the drawbacks side, it will need the system to ensure that all replicas of a relation are consistent. This shows that all the replicas of the rel
Record based Logical Models: Use records as the key data representation components Examples: Relational Model: It shows data as well as relationship between data in the form
What do you understand by transitive dependencies? Define with an example any two problems that can take place in the database if transitive dependencies are available in the datab
CREATE TABLE prodtrans ( pno number (4) ptype char (1) CHECK (ptype in ('I','R','S')), qty number (5) FOREIGN KEY pno REFERENCES product (pno) ON DELETE CASCADE);
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
What is Nested Queries explain in details? Nested Queries - A SELECT query could have subquery(s) in it. While a SELECT query having another SELECT query in it, is known as n
#ques Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a p
what is the need of a log in dbms
Question 1 What do you mean by database management system? Question 2 Write a note on Object-Oriented Model Question 3 Explain Sequential File Organization Question
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
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