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

Time for action – using the ASH report from the standby database


From 11gR2 onwards, the Active Session History report can be created to monitor the performance of a standby database from the standby system. To use this feature, ensure that the database is up-and-running in the Read-Only mode and the session history has retained the memory. Then, you can perform the following steps:

  1. Generate an ASH report using the ashrpt.sql script. Before using this report you must know what parameters we have to pass while the report is running, for example, duration between two dates and times. Use the ashrpt.sql script as follows:

    SQL> @?/rdbms/admin/ashrpt.sql
    Current Instance
    ~~~~~~~~~~~~~~~~
       DB Id    DB Name      Inst Num Instance
    ----------- ------------ -------- ------------
     1316772835 ORCL                1 INDIA
    You are running ASH report on a Standby database. To generate the report
    over data sampled on the Primary database, enter 'P'.
    Defaults to 'S' - data sampled in the Standby database...