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Benefits of Hashed file Organisation
1. Insertion or search on hash-key is quick.
2. Best if equality search is required on hash-key.
Drawbacks of Hashed file Organisation
1. It is a difficult file Organisation method.
2. Search is slow.
3. It suffers from disk space overhead.
4. Unbalanced buckets degrade performance.
5. Range search is slow.
Explain DML with some examples? DML - Data Manipulation Language: statements used for managing data within schema objects. Some examples: • SELECT - retrieve data from the a da
using the invoice table shown below,write the relational schema,draw a dependencies,inclunding all partial and transitive dependencies.assume that the table does not contain repeat
Scenario 1: Power goes out after the first instruction. What happens?
pine vally company
What are ways of finding out either an update is required or not for derived attributes? The ways to find out an update is required or, not are as: Explicit update
What is theta join explain? Theta Join - The theta join operation is an extension to the natural-join operation which permits us to merge selection and a Cartesian
What is the difference between a key and a superkey? Key - A key a single attribute or a combination of two or more attributes of an entity set which is used to identify one
What is an E-R model? Draw an E-R Diagram for the company database with following Descriptions? The company is organized within departments. Each department has a unique name a
I need some help with my normalization database homework.
What is OMR? OMR (Optical Mark Recognition) is the translation of marks - or the absence of marks - but not the shape of the mark on forms that have small circles ("also called
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