What is bucket overflow and how bucket overflow is handled, Database Management System

Assignment Help:

What is bucket overflow and how bucket overflow is handled through Over Flow Chaining or Closed Hashing?

Ans: Bucket: unit of storage holding records. Bucket is a disk block or contiguous block .Bucket contains multiple records.

Hash Function: maps records to bucket numbers Function h from set of all search key values K to the set of all bucket addresses (numbers) B .Records along with different search key values may be mapped similar bucket. Whole bucket has to be searched to locate record. If bucket is full required overflow buckets and pointers

How to handle bucket overflow:

• Buckets overflow is handled through using overflow buckets
1. Closed Hashing (Chaining): The overflow buckets of a given bucket are chained together in a linked list
2. Open Hashing: place in further available bucket (not suitable for database applications)
3. Multiple Hashing : use a second hash function


Related Discussions:- What is bucket overflow and how bucket overflow is handled

What is a select operation, What is a SELECT operation? The select oper...

What is a SELECT operation? The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.

SQL, Ask Write the SQL code that will create the table structure for a tabl...

Ask Write the SQL code that will create the table structure for a table named EMP _1. This table is a subset of the EMPLOYEE table. The basic EMP_1 table structure is summarized in

What are the two types of indices, What are the two types of indices? T...

What are the two types of indices? The two types of indices are:- A)     Dense index B)      Sparse index

What are aggregate functions, What are aggregate functions? And list the ag...

What are aggregate functions? And list the aggregate functions supported by SQL? Aggregate functions are functions that take a collection of values as input and return a one va

State the object design for processing, State the Object Design for Process...

State the Object Design for Processing  The object design phase comes after analysis and system design phase. The object design phase includes implementation details like as i

Project, write a database program for concurrency transaction in a bank

write a database program for concurrency transaction in a bank

Explain transaction, What is transaction? Collections of operations tha...

What is transaction? Collections of operations that form a single logical unit of work are known as transactions.

Explain about primary key, Explain about primary key Primary Key: It ...

Explain about primary key Primary Key: It is one of the candidate keys that are taken to be the recognizing key for the entire table. E.g. although there are two candidate ke

Explain the functional mode with help of an example, Explain the Functional...

Explain the Functional Mode with help of an example. Functional Model  The functional model shows a computation and functional derivation of data values in it without ind

What is the meaning of redundant associations, Adding Redundant Association...

Adding Redundant Associations for Efficient Access The expression redundant association means using "duplicate association for proficient access". While analysis, it is not a

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd