Book Image

Oracle Database 12c Backup and Recovery Survival Guide

Book Image

Oracle Database 12c Backup and Recovery Survival Guide

Overview of this book

The three main responsibilities of a successful DBA are to ensure the availability, recoverability, and performance of any database. To ensure the recoverability of any database, a DBA needs to have a strong backup and recovery skills set. Every DBA is always looking for a reference book that will help them to solve any possible backup and recovery situation that they can come across in their professional life. Oracle Database 12c Backup and Recovery Survival Guide has the unique advantage to be a reference to all Oracle backup and recovery options available, making it essential for any DBA in the world. If you are new to Oracle Database, this book will introduce you to the fantastic world of backup and recovery that is vital to your success. If you are an experienced DBA, this book will become a reference guide and will also help you to learn some possible new skills, or give you some new ideas you were never aware about. It will also help you to easily find the solution to some of the most well known problems you could find during your career as a DBA. This book contains useful screenshots, scripts, and examples that you will find more than useful. Most of the books currently available in the market concentrate only on the RMAN utility to backup and recovery. This book will be an exception to the rule and will become a must-have reference, allowing you to design a real and complete backup and recovery strategy. It covers the most important topics on Oracle database such as backup strategies, Nologging operations, new features in 12c, user managed backups and recoveries, RMAN (including reporting, catalog management, troubleshooting, and performance tuning), advanced data pump, Oracle Enterprise Manager 12c and SQL Developer. "Oracle Database 12c Backup and Recovery Survival Guide" contains everything a DBA needs to know to keep data safe and recoverable, using real-life scenarios.
Table of Contents (22 chapters)
Oracle Database 12c Backup and Recovery Survival Guide
Credits
About the Author
Acknowledgement
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

Reducing redo generation


This section shows you how to reduce redo generation using the LOGGING and NOLOGGING operations. The discussion is divided into two parts. In one part, you'll learn about things to do when LOGGING is in effect. In the other, you'll learn what to do when NOLOGGING is enabled.

Tips when LOGGING is in effect (not using NOLOGGING)

This section will cover some interesting tips to reduce redo generation without the need to use NOLOGGING.

Backups

As I mentioned earlier in the Redo generation and recoverability section in Chapter 1, Understanding the Basics of Backup and Recovery, user-managed backups can generate more redo. The best way to eliminate this problem is to use RMAN. RMAN does not need to write entire blocks to redo because it knows when a block is being copied. If you need to use the user-managed backup technique, then you can follow these steps to reduce redo generation:

  • Do not back up all the tablespaces at once (using the ALTER DATABASE BEGIN BACKUP command)....