Which of the following query optimization may not get better performance? Add missing indexes Avoid using multiple OR in the FILTER predicate Avoid too many JOINS Use SELECT * instead of SELECT fields

Which of the following query optimization may not get better performance? Add missing indexes Avoid using multiple OR in the FILTER predicate Avoid too many JOINS Use SELECT * instead of SELECT fields

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

SQL

SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.

Question

O
3 point
Which of the following query optimization may not get better performance?
Add missing indexes
Avoid using multiple OR in the FILTER predicate
Avoid too many JOINS
Use SELECT instead of SELECT fields

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