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A database is a set of data. But, is the data kept in a database trustworthy? To answer that query we must first answer the question. What is integrity?
Integrity simply means to keep the consistency of data. Therefore, integrity constraints in a database make sure that changes made to the database by authorised users do not compromise data consistency. Therefore, integrity constraints do not permit damage to the database.
There are primarily two integrity constraints: the referential integrity constraint and the entity integrity constraint. In order to describe these two, let us first describe the term Key with respect to a Database Management System.
Indexed (Indexed Sequential) File Organisation It organises the file like a big dictionary, i.e., records are kept in order of the key but an index is stored which also allows
Explain the ISA relationship Answer: ISA relationship - ISA notation is employed in generalization/ specialization to depict relationship among lower and higer level entity s
Data Definition Language It organises the data in the form of columns and rows. But what does the data field column of table accumulate? How do you describe it using SQL? Th
Which database level is closest to the users? External database level is closest to the users.
Define the Third Normal Form: The third normal form (3NF) is a normal form employed in database normalization. 3NF was initially defined by E.F. Codd in 1971. Codd's definitio
Question: (a) What are the challenges in the development of Large Scale Distributed Real Systems? (b) What is backward engineering and forward engineering in a design packa
Describe the functions and features of foreign key? Foreign Key : The primary key of one file or table that is implanted in another file or table to implement the relationships
Explain what is Aggregation? Aggregation: Aggregation is an significant concept in database design whereas composite objects could be modelled during the design of database a
A distributed database is defined as "a collection of multiple logically interrelated database which are physically distributed over a computer network" (a) Give any three advan
How does the system cope up with a record crash when recovery is going on after the first crash? Ans: In a system the undo and redo operations are needed to be idempotent to c
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