Thursday, 4 September 2014

What happening when executing adpreclone.pl in DB and Apps Tier?


adpreclone.pl - This is the preparation phase, will collects information about the source system, creates a cloning stage area, and generates templates and drivers. All of these are to reconfigure the instance on a Target machine.
Preclone will do the following:

Convert Symbolic links
All symbolic links pointing to a static path will be converted into relative paths

Create templates
Any files under the $ORACLE_HOME that contain system specific information, will be replicated and converted into a template. These templates are placed into the $ORACLE_HOME/appsutil/template directory.

Create driver(s)
A driver file, relating to these new templates is created called instconf.drv. This contains a list of all the templates and their locations, and the destination configuration files that these templates will create.
This driver file is called instconf.drv and is placed into directory
$ORACLE_HOME/appsutil/driver

Create Stage area
A clone stage is created containing the required java code and scripts to reconfigure the instace on the Target machine

Rapid Clone stage area:
dbTier : $ORACLE_HOME/appsutil/clone
appsTier(s) - $COMMON_TOP/clone

The stage area(s) consist of the following directories:-
 jre used to run the java code on the Target machine.
 bin contains the RapidClone scripts that can be run on the Target machine:-


  •    adclone.pl is the main cloning script
  •    adcfgclone.pl is used to configure the Target system, this calls adclone.pl
  •    adclonectx.pl is used to clone a Source XML file manually
  •    adaddnode.pl is used to add a new node to the Patch History tables
  •    adchkutl.sh checks for existence of require O/S utils, cc, make, ar and ld

 jlib contains all the Rapid Clone java code, jdbc libraries etc
 context contains templates used for a Target XML file
 data (Database Tier only) contains the driver file, and templates used to generate the control file SQL script
 adcrdb.zip contains the template and list of datafiles on the Source
 addbhomsrc.xml contains information on the datafile mount points of the Source
 appl (Applications Tier only) this is used when merging appltops, i.e Multi-node to Single node cloning


Adpreclone Process in Detail :


When running adpreclone.pl dbTier :

This will run in two steps Techstack and database. 
 

Techstack:


It will create following directories in the ORACLE_HOME/appsutil/clone
Jlib, db, data where "Jlib" relates to libraries "db" will contain the techstack information, "data" will contain the information related to datafiles and required for cloning.
Creates driver files at ORACLE_HOME/appsutil/driver/instconf.drv 
Converts inventory from binary to xml, the xml file is located at $ORACLE_HOME/appsutil/clone/context/db/Sid_context.xml 
 
Prepare database for cloning:

This includes creating datbase control file script and datafile location information file at
$ORACLE_HOME/appsutil/template
adcrdbclone.sql, dbfinfo.lst 
Generates database creation driver file at ORACLE_HOME/appsutil/clone/data/driver
data.drv 
Copy JDBC Libraries at ORACLE_HOME/appsutil/clone/jlib/classes12.jar and appsoui 
 
When Running adpreclone appsTier : 

This will create stage directory at $COMMON_TOP/clone. This also run in two steps. 
 
Techstack:
 
Creates template files for
Oracle_iAS_Home/appsutil/template
Oracle_806_Home/appsutil/template 

Creates Techstack driver files for
 
IAS_ORACLE_HOME/appsutil/driver/instconf.drv
806_ORACLE_HOME/appsutil/driver/instconf.drv 
 
APPL_TOP preparation:

-   It will create application top driver   file$COMMON_TOP/clone/appl/driver/appl.drv
-   Copy JDBC libraries$COMMON_TOP/clone/jlib/classes111.zip 
 
Now Shutdown all the services of Application and database for Copy the file System to target location 

Configuring the target system
Once it is done .

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