migrating from singel instance to rac and upgrading via data guard

8/2/2019 MIgrating from Singel Instance to RAC and Upgrading via Data Guard

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MIGRATINGFROM SINGLE INSTANCETO RAUPGRADING: A DATA GUARD SUCCESS ST

Fuad Arshad @fuadar

Walgreen Company


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Me, Myself & I

More than 15 years of Oracle experience Worked in textiles, telecom & retail/healthcare Currently work for Walgreens in the Enterprise

Services area

Areas of Interest: backup & recovery, high avaMAA, performance tuning


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Socially Networkable

Twitter @fuadar Linkedin http://www.linkedin.com/in/fuadar

G+ +Fuad Arshad

Blog http://www.fuadarshad.com
http://www.fuadarshad.com/http://www.fuadarshad.com/


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$67B 2010 sales

244,000 employees

7,800 locations

In 36th consecutiveyear of record sales

To be My Walgreensfor everyone in America, and the firsthealth and daily living.

Fortune:Most Admired Compayears

Fast Company: Named as 6th

health care company for leadecare services

Computerworld: CIO Tim The2012 Premier 100 IT Lea


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Agenda

Problem Analysis Decision Strategy Migration Things to look out for! Credits


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Community Access

RAC Attack

IOUG RAC SIG

IOUG

Blogs / Blogs /Blogs .

http://www.orana.info

http://blogs.oracle.com

http://www.oaktable.net

Ask Questions

Freelists Oracle L

Stack Overflow

Quora

MOS Communities

Oracle Forums
http://www.racattack.org/http://www.oracleracsig.org/http://www.ioug.org/http://www.orana.info/http://blogs.oracle.com/http://www.oaktable.net/http://www.freelists.org/oracle-l%20aclehttp://stackoverflow.com/questions/tagged/oraclehttp://www.quora.com/https://communities.oracle.com/portal/server.pt/community/support/219http://forums.oracle.com/http://stackoverflow.com/questions/tagged/oraclehttp://stackoverflow.com/questions/tagged/oraclehttp://forums.oracle.com/https://communities.oracle.com/portal/server.pt/community/support/219http://www.quora.com/http://stackoverflow.com/questions/tagged/oraclehttp://www.freelists.org/oracle-l%20aclehttp://www.oaktable.net/http://blogs.oracle.com/http://www.orana.info/http://www.orana.info/http://www.ioug.org/http://www.oracleracsig.org/http://www.racattack.org/


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The Problem

It was very early, and we were still like beta ostage, and so we started receiving a ton of do

The server became overloaded, and that's wh

realized that this had a huge market.

Shawn Fanning (Napster)

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Our Problem

The application was growing and adding fe Customer access slowdown was reported

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Our Problem

System built in the early 2000s to handle thwave of technology More work as newer features were rolled ou

Architecture & design not intended to handlrate of change Database is always the bottleneck

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Analysis

Active/Passive servers Oracle database version close to desupp Old OS version

Old SAN infrastructure CPU and disk I/O issues

Result -----> IT WAS OLDPaper #371


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Analysis

Active/Passive Servers Oracle Database version close to desupp Old OS version

Old SAN infrastructure

Result ---------------- IT WAS OLDPaper #371


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Decision

Lets migrate to RAC Can it be done yesterday? Can we do it with zero downtime?

The application team doesnt want to chaanything

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Strategy

Export/Import Transportable Table spaces Disk based replication

GoldenGate Data Guard - The Choice

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Pre-Migration

Build of servers Build of network

RAC starter kits

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Pre-Migration

The strategy was to build a RAC database from a sininstance environment

Oracle provided instructions on how to prep the singleenvironment so that it is RAC-aware. This includes ru

catclust scripts and adding undo tablespaces for the nnodes that the new cluster will have

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Pre-Migration

The server builds need to have all the patches basedthat is being used

Oracle provides a variety of starter kits that can be usvalidate the configuration

It is also important that the network be configured andbased on best practices

11.2.0.2 and above have added requirements like SCneed to be accounted for

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Pre-Migration

RAC Check is important tool to ensure that the envirobuilt based on best practices

RAC Check can be downloaded at MOS # 1268927.1updated frequently

OS settings including kernel parameters and patch CRS/Grid Infrastructure RDBMS memory and database parameters ASM parameters and statistics

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Pre-Migration (Primary)

Data Guard setup steps need to be followed which inclu

Enable supplemental logging & force logging on primary

Add additional REDO threads (Based on # of RAC nodes)

Add additional UNDO tablespaces (Based on # of RAC nodes)

Backup the primary database Create a PFILE from the primary database

Copy TNSNAMES and LISTENER files into a staging directory

Configure the primary database for Data Guard

Paper #371


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Pre-Migration

RAC Check is important tool to ensure that the envirobuilt based on best practices

RAC Check can be downloaded at MOS # 1268927.1updated frequently

OS settings including kernel parameters and patch CRS/Grid Infrastructure RDBMS memory and database parameters ASM parameters and statistics

Paper #371


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Pre-Migration (Standby RAC) Data Guard setup steps need to be followed which in

NFS mount or copy backup and auxiliary files Configure Oracle Net which includes setting up TNSNAMES anfor 11.2.0.2 (This will be done in the Grid infrastructure home)

Modify the TNSNAMES.ORA to include the primary as well as ttns entries

Create a tns entry for the listener and make sure it is referenceREMOTE_LISTENER (REMOTE_LISTENER specifies the globlisteners in a RAC configuration)

Make sure the listener alias referenced by the LOCAL_LISTENinitialization parameter is in each standby tnsnames.ora file

Ensure that the standby server has the same software version installed as the primary Paper #371


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Pre-Migration (Standby RAC, conData Guard setup steps need to be followed which includ

Ensure that a password file is configured on both the primary anstandby Copy the PFILE to the $ORACLE_HOME/dbs in the standby no Add DB_UNIQUE_NAME and CLUSTER_DATABASE paramet

PFILE

Modify all the other parameters outlined in the white paper Connect to the standby and create an SPFILE in the ASM diskg Startup the proposed standby environment in NOMOUNT mode Duplicate the database using DUPLICATE TARGET DATABAS

STANDBY

Setup Server Control (SRVCTL) to register the instances

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Pre-Migration (Standby RAC, conData Guard setup steps need to be followed which includ

Add additional standby REDO logs (The number of standby redbe one more than the number of online REDO logs per thread athe same size)

Enable Managed Recovery Mode on the standby database Enable archive destination on the primary to start shipping logs

standby Validate the transfer Setup Data Guard Broker Validate the configuration and ensure that logs are being applie

Bring up the other nodes in the RAC environment

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Migration

Migrating is simple after the Data Guard database is setup

Ensure all ARCHIVELOGS have been applied Put the primary database in restricted mode and switch ARCHI After all the outstanding logs have been applied, shutdown RE

the standby

Validate SCN across the primary and the standby Two options from here:

- Switchover & upgrade

- Shutdown & upgrade

**We Chose Shutdown & Upgrade**

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Migration

All standby RAC nodes can be up if using DBUA

Ensure pre-checks are done

DBUA is brutal if you dont remove the obsolete parameters

DST changes are important If manually upgrading DBMS_DST needs to be run to upgrade

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Things to Look Out ForEnsure Environments Are Validated

RDA should be run and all issues fixed RAC check will give you a detailed overview of the system Ensure all starter kits and the RAC manuals are consulted: the re

a good best practices evolving document

Use services to better manage how the application connects and

balance your system Private network is key with RAC: follow Oracles best practices. XA changes in 11.2.0.2 & can cause issues: important to unders Compatible parameter testing is important. Monitoring the environment after go-live is very important

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CreditsId like to thank the following people for helping me with t

presentation and accompanying white paper: Matthew Gallagher, Architect -- Walgreens

Brice Lahl, Manager DB Architecture -- Walgreens

Daniel Morgan, ACE Director -- Drugstore.com

A special shout out to Arup Nanda & Alex Gorbachev for encouraging me Leighton Smith for reviewing my session

Also special credit to the RAC Assurance Team at Oracle for helping is get through subsequent issues. Some content in the whitepaper and presentation has been republished wthe Oracle RAC Assurance Team whose goal had been to proactivelyprovide input to custoexisting CRS, RAC, ASM and MAA implementations.

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Questions

Please fill

outevaluations

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migrating from singel instance to rac and upgrading via data guard

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