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Explain hash file organization?
Hash functions
a) The distribution is uniform
Hash functions assign each bucket the similar number of search -key values from the set of all possible search-key values
b) The distributed in random
In the average case every bucket will have nearly same no of values assigned to it, regardless of the actual distribution of search-key values
Handling of bucket overflows
o Insufficient buckets
o Skew
Open hashing
Under an alternative approach known as open hashing
Close hashing
The form of hash structure that we have just explained is something referred to as close hashing.
Hash indices
You are required to implement integrity constraints within the database to enforce the following requirements: For Projects: Start date must be supplied. Start date cannot be i
limitations and benefits in database tecknowlagy
Describe the objective of Structural Diagrams The main objective of structural diagram is to visualize, construct, specify and document static aspects of a system. Their eleme
Type of database technology
Example RELATION SCHEMA for STUDENT: STUDENT (Roll No: string, name: string, login: string, age: integer) RELATION INSTANCE
design a generalization specialization hierarchy for a motor vehicle sales company. the company sells motorcycles, passenger cars, vens and buses.
Heap files (unordered file) Mostly these files are unordered files. It is the easiest and most basic type. These files having of randomly ordered records. The records will have
Define data conversion? Helpful to load data into temporary staging tables. Then can write SQL code to do much of data processing. SQL code is simpler and faster to write than
Explain the Cartesian product: The Cartesian product operation does not need relations to union-compatible. The meaning of this is that the involved relations may have dissim
Conversion of entity sets: I) For every strong entity type E in the ER diagram, we make a relation R containing all the easy attributes of E. The relation R pri
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