AutoConfig in Oracle Apps 11i / R12 / 12i

In Oracle Applications 11i & R12 (12i) all the configuration parameters are captured in two context files:
-> Application context file called the .xml contains the configuration information for the
application tier & is located in $APPl_TOP/admin for each node of application tier.
->Database context file called the .xml contains the configuration information for the database
tier & is located in $ORACLE_HOME/appsutil/.

Details stored in the context file contains host names,domain name , directory structure, port
numbers used ……

The AutoConfig feature of Oracle application manager(OAM) is used to update & manage context files.

Updating Context file:-
Suppose we want to update the active port from to 80 , for this we will edit the application context file as follows:
Step 1 :Start all services
$ $COMMON_TOP/admin/scripts//adstrtal.sh APPS/
Step 2 :log on to OAM & click site map.
Step 3:Click AutoConfig from the list of System Configuration features in the Administration tab.
Step 4 : Click the Edit Parameter button for the application tier context file to access the Context File Parameters page & then click the system tab.
Step 5 : Click the Focus icon (blue triangle) for oa_web_server. This expands oa_web_server and shows the web server related parameters.
Step 6:Update the Web Port (s_active_webport) parameter from <> to 80.
Step 7 : Save it & answer the tab.Then logout of OAM. AutoConfig Script

The autoconfig script uses information from the context file to generate all applications configuration files & updates database profiles. It is located in
Application tier: $COMMON_TOP/admin/scripts/CONTEXT_NAME/adautoconfig.sh
Database tier: $ORACLE_HOME/appsutil/scripts/CONTEXT_NAME/adautoconfig.sh

Now we run the autoconfig script to reconfigure the oracle application system with the updated Applications context.
Step 1 : Stop all services
$ $COMMON_TOP/admin/scripts//adstpall.sh APPS/
Step 2:Run the autoconfig script, $adautocfg.sh & respond to the prompts.
Step 3:Check log files for any errors.log file for autoconfig is adconfig.log & is located in
/admin//log/MMDDhhmm/
Step 4: Restart all services :
$ $COMMON_TOP/admin/scripts//adstrtal.sh APPS/

Rolling back an autoconfig session:-
Each execution of AutoConfig creates a roll back script in case you want to revert back to the previous configuration settings. For this we perform the following steps:
Step 1 :Shut down all services:
$ cd $COMMON_TOP/admin/scripts/
$ adstpall.sh APPS/
Step 2:Restore AutoConfig session.
$ cd $APPL_TOP>/admin//out/MMDDhhmm
$ restore.sh
Step 3 : Restart all services:
$ $COMMON_TOP/admin/scripts//adstrtal.sh APPS/
Restoring the AutoConfig updated files and restarting the services allows you to log on to OAM.

Restoring the previous configuration:-
Now we run OAM AutoConfig to restore the Applications Context.
Step 1 :Log on to the Oracle Application Manager (OAM) & click site map.You will be able to log on but some services will be down.
Step 2: Click AutoConfig from the list of System Configuration features in the Administration tab.
Step 3 : Click the Show History button for the application tier context file to access the Context File History page.
Step 4 :Click the Show Differences from Current Configuration button to see the recently updated parameters & Select Restore Previous Value for the Web Port and Discoverer Port parameters.
Step 5 :Save & respond the tabs. Log out of OAM.
Step 6 :Shut down all services:
$ cd $COMMON_TOP/admin/scripts/
$ adstpall.sh APPS/
Step 7 :Run the AutoConfig script, adautocfg.sh & Respond to the prompts.
Step 8 : View the log file and check for any errors.
Step 9 : Restart all services:
$ $COMMON_TOP/admin/scripts//adstrtal.sh APPS/
Step 10 :Log on to the Oracle Application Manager (OAM)
If the status of some services appears to be down, click the Refresh icon to update the status.

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