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Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482

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Section
BuyFindarrow_forward

Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482
Chapter 11, Problem 17P
Textbook Problem
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Problems 17–21 are based on the following query:

SELECT V_CODE, V_NAME, V_CONTACT, V_STATE
FROM VENDOR
WHERE V_STATE = 'TN'
ORDER BY V_NAME;

What indexes should you create and why? Write the SQL command to create the indexes.

Program Plan Intro

Indexes:

  • Indexing is a technique that is used in SQL(Structured Query Language) for optimizing the performance.
  • Indexes are used when a small set of rows needs to be selected from the table that is large in size.
  • The selection of rows is made by specifying conditions.

Rules for using indexes:

The below are the rules how the indexes can be used

  • When an indexed column appears within itself in the search criteria of “WHERE” or “HAVING” clause.
  • When an indexed column appears within itself in “GROUP BY” or “ORDER BY”clause.
  • When the indexed column is applied with functions MAX and MIN.
  • When the indexed column’s data sparsity is high.

Syntax for creating INDEX:

The below mentioned is the syntax for creating the index:

CREATE [UNIQUE]INDEX indexname ON tablename(column1 [, column2])

Explanation of Solution

Index that needs to be created:

  • For the given query it is necessary to create an index for the column “V_STATE”.
  • The index created will help in proper execution of the query because “V_STATE” column is used as conditional criteria in the conditional expression.
  • It is also necessary to create index for the column “V_NAME” because it is used in the “ORDER BY” clause.
  • Therefore, it is necessary to create two index commands for the attributes “V_STATE” and “V_NAME”.

Creation of the SQL commands:

The index for the given query is generated with the following names “VEN_MYNDX1” and “VEN_MYNDX2”...

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Chapter 11 Solutions

Database Systems: Design, Implementation, & Management
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Ch. 11 - What are optimizer hints, and how are they used?Ch. 11 - What are some general guidelines for creating and...Ch. 11 - Most query optimization techniques are designed to...Ch. 11 - What recommendations would you make for managing...Ch. 11 - What does RAID stand for, and what are some...Ch. 11 - SELECT EMP_LNAME, EMP_FNAME, EMP_AREACODE, EMP_SEX...Ch. 11 - Problem 1 and 2 are based on the following query:...Ch. 11 - Using Table 11.4 as an example, create two...Ch. 11 - Problems 46 are based on the following query:...Ch. 11 - Problems 46 are based on the following query:...Ch. 11 - Problems 46 are based on the following query:...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 15 and 16 are based on the following...Ch. 11 - Problems 15 and 16 are based on the following...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - SELECT P_CODE, P_DESCRIPT, P_PRICE, P.V_CODE,...Ch. 11 - Problems 2224 are based on the following query:...Ch. 11 - Problems 2224 are based on the following query:...Ch. 11 - Problems 25 and 26 are based on the following...Ch. 11 - Problems 25 and 26 are based on the following...Ch. 11 - Problems 27 and 28 are based on the following...Ch. 11 - Problems 27 and 28 are based on the following...Ch. 11 - Problems 2932 are based on the following query:...Ch. 11 - Problems 2932 are based on the following query:...Ch. 11 - Problems 2932 are based on the following query:...Ch. 11 - Problems 2932 are based on the following query:...

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