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Benefits of heap files
1. This is a easy file Organisation method.
2. Insertion is somehow capable.
3. Good for bulk-loading data into a table.
4. Best if file scans are general or insertions are frequent.
Drawbacks of heap files
1. Retrieval needs a linear search and is inefficient.
2. Deletion can result in unused space/require for reorganisation.
Design a generalization–specialization hierarchy for a motor-vehicle sales company. The company sells motorcycles, passenger cars, vans, and buses. Justify your placement of attrib
Define the terms i) DDL ii) DML DDL: Data base schema is particular by a set of definitions expressed by a special language known as a data definition language. DML: A data
DDL Compiler The DDL compiler changes the data definition statements (such as CREATE TABLE .... in SQL) into a set of tables having metadata tables. These tables have infor
Define the basic operations of the relational algebra? Ans: Basic operators of relational algebra are: 1. Union (∪) - Selects tuples which are in either P or Q or in bot
Question: (a) What are decision support systems, and what role do they play in the business environment? (b) Data mining is a knowledge discovery process of automated extr
notes about update opreation
Define seek time. The time for repositioning the arm is known as the seek time and it enhances with the distance that the arm is known as the seek time.
Define average seek time. The average seek time is the average of the seek times, calculated over a sequence of random requests.
What does conceptual design work? A conceptual design involves modelling independent of the DBMS.
The users who use easy-to-use menu are called ? The users who use easy to use menu are called as Naïve users.
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