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Explain heap file with advantages?
Heap File is an unordered set or a group of records, stored on a set of pages. This class gives basic support for inserting, updating, selecting, and deleting records. Temporary heap files are used for external sorting and within other relational operators. A sequential scan of a heap file (through the Scan class) is the most primary access method.
The First Normal Form (1NF) Let us first describe 1NF: Definition: A relation (table) is in 1NF if 1. There are no duplicate tuples or rows in the relation. 2.
What are the two types of indices? The two types of indices are:- A) Dense index B) Sparse index
What is called an evaluation primitive? A relational algebra operation annotated with instructions on how to evaluate is known as an evaluation primitive.
What is the disadvantage of a call by reference? During a call by reference damage or loss of data is not restricted to the subroutine, but will instantly lead to alters to th
Describe the statement in SQL which allows to change the definition of a table? In SQL Alter statement is used to allow the changes the definition of a table.
Define the terms i) DDL ii) DML DDL: Data base schema is specified by a set of definitions expressed by a special language known as a data def
What are the function of DBA?
What are the Objectives of object design After going through this unit, you could be able to: explain steps of object design; discuss algorithms that reduce costs;
What are the typical phases of query processing
Question: (a) Discuss the difference between a composite key and a composite attribute. How would each be indicated in an E-R diagram? Support your answer with appropriate exam
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