Book Image

Oracle Database XE 11gR2 Jump Start Guide

By : Asif Momen
Book Image

Oracle Database XE 11gR2 Jump Start Guide

By: Asif Momen

Overview of this book

Oracle Database XE 11gR2 is an excellent beginner-level database and is a great platform to learn database concepts. "Oracle Database XE 11gR2 Jump Start Guide" helps you to install, administer, maintain, tune, back up and upgrade your Oracle Database Express Edition. The book also helps you to build custom database applications using Oracle Application Express.Using this book, you will be able to install Oracle Database XE on Windows/Linux operating system.This book helps you understand different database editions and it guides you through the installation procedure with the aid of screenshots. You will learn to interact with the database objects. You will gain a solid understanding of stored sub-programs which is followed by an introduction to Oracle Application Express (APEX). Solid database performance tuning strategies are also discussed in this book followed by backup and recovery scenarios. All in all, "Oracle Database XE 11gR2 Jump Start Guide" delivers everything that you should know to get started with Oracle Database administration.
Table of Contents (20 chapters)
Oracle Database XE 11gR2 Jump Start Guide
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface

Using indexes


Indexes are crucial database objects of your database. Indexes help queries in fetching data using fewer system resources thereby speeding the queries. However, care should be taken when creating new indexes. Too many indexes will lead to negative database performance for DML statements and too few indexes would increase the response time of the queries. Read the How much expensive are indexes? post on my blog to understand the impact of having too many indexes for a table.

There are different types of indexes that you may find in Oracle. Below are a few of the index types.

B*Tree indexes: These are the most commonly used indexes in the Oracle database. They are named after a computer science construct of the same name. B*Tree indexes provide a faster access to an individual row or range of rows normally requiring few system resources. In a B*Tree, every new table record with a not null indexed column will have an entry in the index. The indexes created earlier in this book...