Hello all, As per the request and with experience I am again returing to Cloning of Oracle Application. I know most of them know what exactly happens in cloning but still here I am trying to touch the depths.
Before starting I want to ask question. Why you need to do cloning ? Why we need to duplicate Oracle Application.
We need cloning for various of reasons. suppose I have got production instance and want to test some application. Now here I want to test the application, need to apply some product specific patches which might affect whole application then I have to give downtime which will affect business. So if I had the same this on whic hI can play and test my application or code or say I can apply some patches and at the same time business also run then nothing like it. This can be achieved by cloning or duplicating the application.
Duplicating the application is not easy or its just not simply copy the application, it wont work in any case. Logically it sounds fine just to copy the filesystem and relink it and start the application but its not that easy.
Basically for cloning Oracle Application it can be categorised into three major categories.
-Preparing the Source System
-Copy the file System
-Preparing or say Configuring the Target System
You can achive first and third steps using a Rapid Clone utility which Oracle provides for cloning
There can be many ways and methods to clone Oracle Application which many organisations follows but the only supported method provided by Oracle is using Rapid clone.
Rapid Clone is the new cloning utility introduced in Release 11.5.8. Rapid Clone leverages the new installation and configuration technology utilized by Rapid Install.
Basically there are two cloning methodology using Autoconfig and without using autoconfig. First one that is using autoconfig is completely replaced by Rapidclone.
Non-autocofig cloning methodology was generally used before 11.5.5 that is non autoconfig enabled system.
Here I will discuss Rapid Clone method of cloning and also throw some light on cloning 11.0.3 oracle application as some users are still using that.
So first about the Rapid clone method.
In Category 1 that is first you need to make source for clone. You need to dress up Source system so that only configuration files and not the whole file system is copied.
To start with cloning you need to first check about some pre-requisites some utilities should be of required version
Here are they,
Oracle Universal Installer should be of 220.127.116.11 version
Perl should be of 5.005 version minimum
JRE 1.1.8 and 1.3.1
Zip utility of version 2.3 minimum
Latest Autoconfig Templates patches are applied. TXK-O is the latest till date.
Latest Rapid Clone patches should be applied. Latest is ADX.F till date.
After check ing the pre-requisites now your system is ready to clone.
Preparing the Source system:
After checking the above mentioned pre-requisites now you have to prepare the source system which need to be cloned.
In a broad way what this step will do is this will create the staged clone directory which will be having the driver files and configuration file of the source.
So what exactly is going to happen in this step. Lets get in more details
Basically you have to run the adpreclone.pl script once for Application tier and one for the datbase (even if you are on single node ! )
Lets first check for the Database tier
On Source system, run following as ORACLE user
cd RDBMS Oracle_Home/appsutil/scripts/_perl ./adpreclone.pl dbTier
After running this it goes in two stages
dbTechstack and Database
What exactly it will do is
It will create stage cloned area at $ORACLE_HOME/appsutil/clone This clone directory has got following main directories
It will prepare datbase techstack at dbTechStack stage. Major activities it will take care of at this stage.
-Creates template files at $ORACLE_HOME/appsutil/template
-Creates driver files at $ORACLE_HOME/appsutil/driver/instconf.drv
-Converts inventory from binary to xml
It will prepare datbase at the database stage. Major activities includes
-Create datbase control file script
-Generates database creation driver file
-Copy JDBC Libraries
So all this happens on database side
Now lets concentrate on Application tier side. Again it goes almost in the same way that is in two stages.
As a APPLMGR user on application tier this script is run
cd $COMMON_TOP/admin/scripts/_perl ./adpreclone.pl appsTier
It will also create the staged clone directory at $COMMON_TOP/clone
It goes in two stages. Lets see one by one
atTechStack that is Application tier techstack.
– Creates template files for
-Creates Techstack driver files for
-It will create application top driver file
-Copy JDBC libraries
So this all happens in dressing the source system
After then we need to copy the files.
Copy following files
After this stage now you need to configure the Target node. Basically you will run adcfgclone.pl same for databse tier and for application tier.
Let go in bit more detail:
First we will see for the database tier
On the target node you will run
ORACLE_DB_HOME/appsutil/clone/bin/perl adcfgclone.pl dbTier
Again there are two stages :
First will look at dbTechstack
It will use the driver files and templates which were created at source and has been copied to target.
Following scripts are run
-runInstallConfigDriver —- located in $Oracle_Home/appsutil/driver/instconf.drv
Now for database
-Create database adcrdb.zip
-Autoconfig is run
-Control file creation adcrdbclone.sql
Now on application tier
from COMMON_TOP/clone/bin/perl adcfgclone.pl appsTier
Stage at TechStack
-Creates context file for target adclonectx.pl
-Run driver files
Relinking of Oracle Home
at the end for ApplTop stage
It runs driver and then autoconfig
So this will totally configure your application which has been copied.
At the end you have to some finishing tasks
-Update Printer settings
-Update Workflow Configuration settings
-Update Profile options
This completes you application cloning completely.
So Happy reading folks !!!!
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