Book Image

Oracle Data Guard 11gR2 Administration : Beginner's Guide

Book Image

Oracle Data Guard 11gR2 Administration : Beginner's Guide

Overview of this book

Data Guard is the high availability, disaster recovery and data replication solution for Oracle Databases. With the huge growth of Data Guard it's getting harder to encounter an Oracle DBA not dealing with Data Guard. Since it's a common DBA task to provide high availability of databases, Data Guard is a must-know topic for every Oracle Database Administrator."Oracle Data Guard 11g R2 Beginner's Administration Guide" is a practical guide that provides all the information you will need to configure and maintain Data Guard. This book will show you what Data Guard can really do.By following the practical examples in this book, you'll learn to set up your Data Guard Broker, the management framework for Data Guard configurations. Learn and implement different data protection modes, perform role transitions between databases (switchover and failover) and configure Active Data Guard. Next, we will dive into the features of Snapshot Standby. The book progresses into looking at Data Guard configuration with other Oracle products (such as EM, RAC, and RMAN) and patch databases in Data Guard. The final chapters will cover commonly encountered Data Guard issues and Data Guard best practices, which are very important to make a Data Guard configuration perfect and take maximum advantage of Data Guard properties.
Table of Contents (19 chapters)
Oracle Data Guard 11gR2 Administration Beginner's Guide
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Pop Quiz Answers
Index

Performing prerequisite checks of patch


Before applying any interim CPU patch that is applied through OPatch, it is strongly recommended to perform a prerequisite check in the ORACLE_HOME file that you are going to patch. Patches that are specific to security may be some of the patches that are already applied. Such a patch/patches needs to rollback and again has to apply a merge patch after applying security patches. These merge patches can be requested from Oracle support if they aren't available. Note that no down time is required to perform this check.

You can perform the prerequisite check as follows:

opatch prereq CheckConflictAgainstOHWithDetail -phBaseDir  /home/oracle/patches/9711859
Oracle Interim Patch Installer version 11.2.0.3.0
Copyright (c) 2012, Oracle Corporation.  All rights reserved.
PREREQ session
Oracle Home       : /u01/home/oracle/product/11.2.0/db_1
Central Inventory : /u01/app/oraInventory
   from           : /u01/home/oracle/product/11.2.0/db_1/oraInst.loc
OPatch...