RAC Migration with RCONFIG

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Convert your single instance toRAC database with RCONFIG

360 Degrees

March 17 2011 1Prepared by : Syed Jaffer Hussain


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DisclaimerThis views/content in this slides are those of the author and

do not necessarily reflect that of Oracle Corporation and/or itsaffiliates/subsidiaries. The material in this document is for

informational purposes only and is published with no

guarantee or warranty, express or implied..

This material should not be reproduced or used without the

authors' written permission.



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Know your presenter DBA Team Lead at Alinma Bank Nearly 20 years of IT experience

Over 10 years of DBA hands-on experience

Oracle ACE Oracle Certified Master (OCM) 10g

OCP DBA v8i,9i,10g,11g

RAC expert certified

Co-author Oracle 11g R1/R2 RAC Essentials Official Oracle RAC SIG Representative for Saudi Arabian region

(http://www.oracleracsig.org/)

Recently acquired - ITIL v3 Foundation certification



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Question

What is the uphill task usually a DBAcome across after migrating from the

existing non-RAC environment to RAC?



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AgendaOverview of existing conversion methods.

Convert single instance to RAC with RCONFIG utility

RCONFIG overview Prerequisites

Demonstration

Testing the conversion process.

Tips to accelerate conversion time for VLDB.How to resume from a failed conversion.

Logs to monitor.

Post conversion steps.

Q&A.



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Existing conversion methods Grid Control / Enterprise Manager(EM)

Database Configuration Assistant (DBCA) RCONFIG

Manual

Streams & Data pumps *

Image courtesy: Oracle UniversityMarch 17 2011 6Prepared by : Syed Jaffer Hussain


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Convert single instance toRAC with RCONFIG

RCONFIG overview

Prerequisites

Demonstration



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RCONFIG overview A non interactive command line utility introduced with 10gR2 to

make the life of DBAs easier for converting a single-instance database

to RAC database.

rconfig executable (binary) installed by default, located

under $GRID_HOME/bin & $ORACLE_HOME/bin locations.

Takes in a xml input file and process the conversion procedure.ConvertToRAC.xml (pre 11gR2)

ConvertToRAC_AdminManaged.xml (11gR2)ConvertToRAC_PolicyManaged.xml (11gR2)



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RCONFIG overview

A pretty cool, a very light and easy to use utility for conversion. Comes by default, no additional configuration steps are required.

Not much DBA intervention is required.

Fully automated conversion process.

Provides testing capabilities without actually converting to RAC.

Ability to migrate the non-ASM DB to ASM storage.

Creates RAC DB instances on the specified nodes.

Configure required tnsname and Listeners entries.

Register CRS resources (instance, database, listener) to thecluster.

Startup RAC DB all instances on the specified nodes.

Advantages



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RCONFIG overview

Database downtime is required. Additional space requirements.

Disadvantages



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Migrate single instance toRAC with RCONFIG

RCONFIG overview

Prerequisites Demonstration



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Prerequisites Ensure the clusterware is configured, up and running on the nodes.

Oracle RDBMS binaries for RAC must be installed.

Active ASM instance across the nodes. Create and mount required ASM diskgroups.

Stand alone database running on the local node.

Stand alone db and RAC must be of same db versions.



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ConvertToRAC_AdminManaged.xml contents/u00/app/oracle/product/11.2.0/db_1/assistants/rconfig/sampleXMLs



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ConvertToRAC_AdminManaged.xml contents

The Convert verify option in the ConvertToRAC.xml file has three options:

Convert verify="YES

Runs through verification checks to ensure that the prerequisites for single-instanceto RAC db conversion have been met before it actually starts the conversion.

Convert verify="NOBypass the prerequisite verification checks, and starts conversion straight away.

Convert verify="ONLYDo not perform the actual conversion process. Rather, just run through the

prerequisite verification checks and ends.



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ConvertToRAC_AdminManaged.xml modified contents/u00/app/oracle/product/11.2.0/db_1/assistants/rconfig/sampleXMLs



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The following has been used for the demonstration purpose:

Oracle single-instance db (RACDB), db files configured on

the filesystem.

Oracle 11.2.0.2.

ASM storage for RAC db.

HPUX Itanium 64-bit v11.31 OS.

Convert single instance to RAC with RCONFIG



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Ensure necessary configuration changes are done in the

xml file.

Ensure the single-instance db is up and running on thelocal node.

Execute the following command, typically as oracle user:

./$ORACLE_HOME/bin/rconfig ConverToRAC_AdminManaged.xml

Convert single instance to RAC with RCONFIG Ensure you have a valid and latest backup copy for the single-instance database.

Copy the original xml file before you modify the contents.



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alert_RACDB1.log file contents



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alert_RACDB1.log file contents



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Testing the conversion process$ORACLE_HOME/bin/rconfig ConvertToRAC_AdminManaged.xml

Operation Succeeded

There is no return value for this step

Set the parameter


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Testing the conversion process$ORACLE_HOME/bin/rconfig ConvertToRAC_AdminManaged.xml


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Tips to accelerate conversion time for VLDB

Is there any way to accelerate the conversion time while converting

a very large database (VLDB)?

o Unfortunately, there is no direct option available.

Applying some degree of parallelism in the RMAN might help.

Saved 4 hours of time when converted 1TB Oracle 10g db to RAC.

oWith no parallelism, took almost 9 hours to finish.

o With parallelism (6), took just 4 hours to finish.

RMAN> CONFIGURE DEVICE TYPE DISK PARALLELISM 6;



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Logs to monitor



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Post conversion steps Adjust the SGA for the RAC database, at least 15% for buffer cache

and shared pool.

Create SERVICE and apply TAF & Load balancing options, if required.

Backup the RAC database.

Backup OCR.

Remove single-instance database.



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ReferencesRCONFIG : Frequently Asked Questions [ID 387046.1]

http://sabdarsyed.blogspot.com/2009/08/how-we-faster-process-of-converting-non.html

http://jaffardba.blogspot.com/2008/09/my-experience-of-converting-cross.html

Much more real-world scenarios in our upcoming book Oracle 11g R1/R2 RAC Essentials.



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Thank you for listening

You can mail me at sjaffarhussainATgmail.com

I blog at http://jaffardba.blogspot.com

Follow me on twitter http://twitter.com/sjaffarhussain



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RAC Migration with RCONFIG

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