Oracle 12c dg-setup-rac-phys-standby-to-rac-prim

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2019-08-16

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MAA / Data Guard 12c Setup Guide

Creating a RAC Physical Standby Database for a RAC Primary Database

By Nassyam Basha & YV RaviKumar

Introduction

Oracle Real application clusters (RAC) provides Business continuity, High availability, Scalability,

Flexibility and Agility combined with ease management are the pillars of successful IT infrastructure

and cloud deployments. Oracle RAC environments can also provide continuous service for both

planned and unplanned outages as well as runtime and capacity-on-demand management, the

Oracle RAC Stack ensures uninterrupted data center operations for applications of any kind.

Customer applications benefits through Rolling upgrades for system and hardware changes, Rolling

patch upgrades for some interim patches, Fast, automatic, and intelligent connection and service

relocation and failover and Load balancing advisory and runtime connection load balancing.

Technical Overview

This technical paper focusses on creating a RAC 2-node physical standby database (stdrac) for a RAC

2-node primary database (cdbrac) with step by step procedure including involvement of Data Guard

Broker and how to manage. This article entirely written on Oracle database 12c.

This technical paper assumes that there is an existing RAC primary database with two instances

(cdbrac1 & cdbrac2) and you want to implement Data Guard by adding RAC physical standby

database with two instances (stdrac1 & stdrac2).

Throughout this document, have used the below naming for database name, database unique name,

Oracle net services, instances and the hostnames where they located in below table.

DB_NAME

DB_UNIQUE_NAME

Oracle Net

Service

Name

Instances

Hostnames

Primary

CDBRAC

cdbrac1,cdbrac2

racnroll1,

racnroll2

Standby

CDBRAC

STDRAC

stdrac1,stdrac2

racnroll3,

racnroll4

The steps outlined in this technical document they assume using ASM, and that the software and

ASM instance on the standby host have already been installed/created.

Figure-1: RAC Primary Database with RAC Physical Standby Database

This document includes the following steps:

 Changes of initialization parameters in primary and standby system

 Configure Oracle Net on the RAC primary database and RAC physical standby database

 Perform RMAN Duplicate method to restore database for standby use

 Copy the password file RAC primary database to RAC physical standby database

 Verify Data Guard configuration with creating object with rows.

 Performing switchover using Data Guard Broker.

This technical assumes the following pre-requisites are met for RAC primary database and RAC

physical standby database

 Ensure the primary database is in Archivelog mode and Force logging enabled.

SQL> select log_mode,database_role,open_mode from v$database;

LOG_MODE DATABASE_ROLE OPEN_MODE

----------------- ----------------------- --------------------

ARCHIVELOG PRIMARY READ WRITE

SQL> select force_logging from v$database;

FORCE_LOGGING

-----------------------

YES

Command to enable force logging if it's not configured: SQL> alter database force logging;

 The primary RAC database is located in ASM.

 The standby RAC database will be created on ASM.

 The primary and standby databases are using flash recovery area.

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