Fuad Arshad's Blog » data guard

Oracle Dataguard broker & CFC Part 2

fuadar — Mon, 03 May 2010 18:28:41 +0000

In an earlier post i mentioned how Oracle Dataguard Broker does not support a cold failover cluster like HACMP. Well turns out Broker can be used on a Cold Failover Cluster.
There are a few simple steps that needs to be followed to make the data broker be able to function.

On the primary

 alter system set local_listener=;

This will ensure that the database knows about the listener that is running on a virtual host name.

After this step is completed Follow the steps in Metalink Doc # 808783.1
I’m listing the steps below

ALTER SYSTEM SET DG_BROKER_START=FALSE;
 SQL> show parameter dg_broker_config_file
--- remove files that are displayed on the primary and the start broker on both the primary and the standby
SQL>ALTER SYSTEM SET DG_BROKER_START=TRUE;

After this connect to Dataguard Manager

DGMGRL>CREATE CONFIGURATION 'DGCONF' AS PRIMARY DATABASE IS 'PROD' CONNECT IDENTIFIER IS PROD;
DGMGRL> ADD DATABASE 'STDBY' AS CONNECT IDENTIFIER IS STDBY MAINTAINED AS PHYSICAL; --or LOGICAL
DGMGRL> ENABLE CONFIGURATION;
-- validate
DGMGRL> SHOW CONFIGURATION;
--Success means all is good

The above commands are from the Metalink Doc above and work perfectly for a CFC . We are now able to failover our clusters and have Dataguard broker work for us to manage our configurations.

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Dataguard notes Part 1

fuadar — Wed, 08 Jul 2009 01:38:35 +0000

Over the recent weeks pretty much most of my time has been spent debugging and working with Dataguard related issues and i thought i’d start this post about some notes

1. Know thy purpose.

Before deciding what type of dataguard environment you want to setup , Make sure you understand the business requirements and plan accordingly. If the purpose is DR only use Physical Dataguard. If the purpose is business reporting , use Logical Dataguard.

2. Understand the Load.

It is very important to understand the logic and the business reason behind the setup. Often people recommend a Dataguard setup without actually working through the requirements. This can lead to a cheaper but totally unusable solution which might require lots of rework . Logical Dataguard is much prone to such issues since users expect it to be up and available for performing read only activities and also expect it to be in sync real-time.

Part 2 will go into some technical details on trying to troubleshoot Dataguard issues and how to identify potiential issues .

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Dataguard 11g – No more same hardware/software requirement(partially)

fuadar — Fri, 08 Aug 2008 02:54:00 +0000

While trying to look at dataguard as a reporting environment i found a very neat and fundamentally cost saving feature added on to dataguard in Oracle 11.
According to the Docs

“As of Oracle Database 11g, Data Guard provides increased flexibility for Data Guard configurations in which the primary and standby systems may have different CPU architectures, operating systems (for example, Windows & Linux), operating system binaries (32-bit/64-bit), and Oracle database binaries (32-bit/64-bit).

This is very interesting and actually provide a lot of cost savings to companies that have systems using Windows based servers and can purchase cheaper linux boxes and make that available . The problem is based on the matrix in note 413484.1 pretty much only Windows and Linux can live in a mixed environment . AIX and Solaris can only live with the same architecture.

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