Book Image

Oracle Database 11g : Underground Advice for Database Administrators

By : April Sims
Book Image

Oracle Database 11g : Underground Advice for Database Administrators

By: April Sims

Overview of this book

Today DBAs are expected to deploy and manage large databases with quality service and little to no downtime. The DBA's main focus is on increasing productivity and eliminating idle redundancy throughout the enterprise. However, there is no magic set of best practices or hard and fast rules that DBAs need to follow, and this can make life difficult. But if DBAs follow some basic approaches and best practices, tasks can be performed more efficiently and effectively.This survival guide offers previously unwritten underground advice for DBAs. The author provides extensive information to illuminate where you fit in, and runs through many of the tasks that you need to be watchful of, extensively covering solutions to the most common problems encountered by newcomers to the world of Oracle databases.The book will quickly introduce you to your job responsibilities, as well as the skills, and abilities needed to be successful as a DBA. It will show you how to overcome common problems and proactively prevent disasters by implementing distributed grid computing—scalable and robust—with the ability to redeploy or rearchitect when business needs change. Reduce downtime across your enterprise by standardizing hardware, software, tools, utilities, commands, and architectural components.This book will also help you in situations where you need to install Oracle Database 11g or migrate to new hardware making it compliant with a Maximum Availability Architecture. By the end of this book you will have learned a lot and gained confidence in your abilities. You will be armed with knowledge as to which tools are best used to accomplish tasks while proactively moving towards an automated environment.
Table of Contents (14 chapters)
Oracle Database 11g—Underground Advice for Database Administrators
Credits
About the author
About the reviewers
Preface
Index

Chapter 5. Data Guard and Flashback

There are three types of standby database available in the Enterprise edition of 11g Oracle: Logical, Snapshot, and Physical. This chapter will cover the differences between the standby types, implementation details, and testing/recovery scenarios using both Data Guard and Flashback technologies in tandem for stress testing, hot fixes, and data recovery. Oracle has made further improvements to Data Guard to facilitate the use of standbys for testing purposes—one of these is called Database States. It is a simplified method of turning off the data flow from one standby to another, giving the DBA total control over the process.

Note

Oracle Standard Edition, which doesn't include the automatically managed recovery capabilities found in Data Guard, can be used for some of the steps outlined in this chapter. The basic concepts are the same, all commands will be carried out with SQL*Plus and shell scripting to transport the archivelogs used for recovery. See...