Using Active Data Guard

Purpose

This tutorial shows you how to perform a simple read of data from the standby database:

  • When the standby is caught up, stop the Apply on the physical standby
  • Open the Physical standby read only
  • Restart the apply
  • Begin making changes to the primary
  • Verify that those changes arrive at the standby

Time to Complete

Approximately 20 minutes

Topics

This tutorial covers the following topics:

 Overview
 Prerequisites
 Perform a simple read of data from a standby database
 Summary

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Overview

What Is a Active Data Guard?

In Oracle Database 11 g, you can now use a physical standby database for queries while redo is applied to the physical standby database.

In earlier versions, when you opened the physical standby database in read-only mode, the redo application stopped.

Active Data Guard enables you to use a physical standby database for disaster recovery and to offload work from the primary database during normal operation.

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Prerequisites

Before you perform this tutorial, you should:

1.

Perform an Oracle Database 11g installation (software and db installed) for a single server environment OR Oracle Database 11g installation (software and db installed) on 1 server and Oracle Database 11g software only on 2nd server for a dual server environment.

2.

Creating a DG Broker Configuration OBE

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Perform a simple read of data from a standby database

This task performs a simple read of data in Active Data Guard mode. Perform the following steps:

1.

In your standby database window, invoke DGMGRL and connect as sys/oracle. Disable the MRP process

 

2.

In your standby database window, invoke SQL*Plus and connect as SYSDBA. Open the physical standby database in read-only mode.

 

3.

In your standby database window, invoke DGMGRL and connect as sys/oracle. Restart the MRP process.

 

4.

In your standby database window, invoke SQL*Plus and connect as SYSDBA. Query the HR.REGIONS table.

 

5.

In your primary database window, invoke SQL*Plus and connect as SYSDBA. Insert a row into the HR.REGIONS table.

 

6.

Return to your standby database window and query the HR.REGIONS table again. You should see the new row that you inserted into the HR.REGIONS table on your primary database now in your standby database. If you do not immediately see the row, retry the query.

 

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Summary

In this tutorial, you learned how to:

 Perform a simple read of data from the standby database

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